【DG】DBMS_LOGSTDBY包的应用--逻辑DG跳过某些操作

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👉 本文共约16382个字,系统预计阅读时间或需62分钟。

模拟同步失败

备库创建唯一性索引

SQL> create unique index idx_scott_t_1 on scott.t(user_id);

Index created.

主库插入重复数据

SQL> insert into scott.t select * from scott.t;

36 rows created.

SQL> commit;

Commit complete.

备库自动停止同步

Mon Sep 29 17:22:32 2014
LOGSTDBY: SQL Apply about to stop with ORA-1
LOGSTDBY: SQL Apply finished logging error information
LOGSTDBY Apply process AS02 server id=2 pid=41 OS id=2535 stopped
Errors in file /u01/app/oracle/diag/rdbms/orcl2/orcl/trace/orcl_as02_2535.trc:
ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
Mon Sep 29 17:22:36 2014
Errors in file /u01/app/oracle/diag/rdbms/orcl2/orcl/trace/orcl_lsp0_2507.trc:
ORA-26808: Apply process AS02 died unexpectedly.
ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
Mon Sep 29 17:22:36 2014
LOGSTDBY Analyzer process AS00 server id=0 pid=39 OS id=2531 stopped
Mon Sep 29 17:22:36 2014
LOGSTDBY Apply process AS01 server id=1 pid=40 OS id=2533 stopped
Mon Sep 29 17:22:36 2014
LOGSTDBY Apply process AS03 server id=3 pid=42 OS id=2537 stopped
Mon Sep 29 17:22:36 2014
LOGSTDBY Apply process AS04 server id=4 pid=43 OS id=2539 stopped
Mon Sep 29 17:22:36 2014
LOGSTDBY Apply process AS05 server id=5 pid=44 OS id=2541 stopped
Mon Sep 29 17:22:40 2014
LOGMINER: session#=1 (Logical_Standby$), preparer MS02 pid=36 OS id=2518 sid=46 stopped
Mon Sep 29 17:22:40 2014
LOGMINER: session#=1 (Logical_Standby$), reader MS00 pid=34 OS id=2514 sid=44 stopped
Mon Sep 29 17:22:40 2014
LOGMINER: session#=1 (Logical_Standby$), builder MS01 pid=35 OS id=2516 sid=34 stopped
LOGSTDBY status: ORA-16222: automatic Logical Standby retry of last action
LOGMINER: Parameters summary for session# = 1
LOGMINER: Number of processes = 3, Transaction Chunk Size = 201
LOGMINER: Memory Size = 30M, Checkpoint interval = 150M
LOGMINER: SpillScn 1114702, ResetLogScn 995548
LOGMINER: summary for session# = 1
LOGMINER: StartScn: 0 (0x0000.00000000)
LOGMINER: EndScn: 0 (0x0000.00000000)
LOGMINER: HighConsumedScn: 1114646 (0x0000.00110216)
LOGMINER: session_flag: 0x1
LOGMINER: Read buffers: 16
Mon Sep 29 17:22:43 2014
LOGMINER: session#=1 (Logical_Standby$), reader MS00 pid=34 OS id=2554 sid=34 started
Mon Sep 29 17:22:43 2014
LOGMINER: session#=1 (Logical_Standby$), builder MS01 pid=35 OS id=2556 sid=44 started
Mon Sep 29 17:22:43 2014
LOGMINER: session#=1 (Logical_Standby$), preparer MS02 pid=36 OS id=2558 sid=45 started
LOGMINER: Turning ON Log Auto Delete
Mon Sep 29 17:22:45 2014
LOGSTDBY Analyzer process AS00 started with server id=0 pid=40 OS id=2560
Mon Sep 29 17:22:45 2014
LOGSTDBY Apply process AS01 started with server id=1 pid=41 OS id=2562
Mon Sep 29 17:22:45 2014
LOGSTDBY Apply process AS04 started with server id=4 pid=44 OS id=2568
Mon Sep 29 17:22:45 2014
Mon Sep 29 17:22:45 2014
LOGSTDBY Apply process AS05 started with server id=5 pid=45 OS id=2570
Mon Sep 29 17:22:45 2014
LOGSTDBY Apply process AS03 started with server id=3 pid=43 OS id=2566
LOGSTDBY Apply process AS02 started with server id=2 pid=42 OS id=2564
LOGMINER: Begin mining logfile for session 1 thread 1 sequence 42, /u01/app/oracle/fast_recovery_area/ORCL2/onlinelog/o1_mf_4b2l8vov0.log
LOGSTDBY: SQL Apply about to stop with ORA-1
LOGSTDBY: SQL Apply finished logging error information
LOGSTDBY Apply process AS01 server id=1 pid=41 OS id=2562 stopped
Errors in file /u01/app/oracle/diag/rdbms/orcl2/orcl/trace/orcl_lsp0_2507.trc:
ORA-26808: Apply process AS01 died unexpectedly.
ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
LOGSTDBY Analyzer process AS00 server id=0 pid=40 OS id=2560 stopped
LOGSTDBY Apply process AS02 server id=2 pid=42 OS id=2564 stopped
LOGSTDBY Apply process AS03 server id=3 pid=43 OS id=2566 stopped
LOGSTDBY Apply process AS04 server id=4 pid=44 OS id=2568 stopped
LOGSTDBY Apply process AS05 server id=5 pid=45 OS id=2570 stopped
Errors in file /u01/app/oracle/diag/rdbms/orcl2/orcl/trace/orcl_as01_2562.trc:
ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
LOGMINER: session#=1 (Logical_Standby$), reader MS00 pid=34 OS id=2554 sid=34 stopped
LOGMINER: session#=1 (Logical_Standby$), preparer MS02 pid=36 OS id=2558 sid=45 stopped
LOGMINER: session#=1 (Logical_Standby$), builder MS01 pid=35 OS id=2556 sid=44 stopped

trace文件/u01/app/oracle/diag/rdbms/orcl2/orcl/trace/orcl_as02_2535.trc里有这个事务相关信息

ERROR INFORMATION:
PRIMARY TXN xid: 0x0003.003.0000033b (XIDUSN = 3, XIDSLT = 3, XIDSQN = 827)
start scn: 0x0000.0011024e (1114702) commit scn: 0x0000.00110250 (1114704)

视图里有可读性强的错误信息

SQL> select event, status from DBA_LOGSTDBY_EVENTS;

EVENT STATUS


insert into "SCOTT"."T" ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
values
"USERNAME" = 'SYS',
"USER_ID" = 0,
"CREATED" = '17-SEP-11'

。。。。。。。。。。。

根据上面的xidusn,xidslt,xidsqn跳过事务

SQL> exec dbms_logstdby.skip_transaction (3, 3, 827);

PL/SQL procedure successfully completed.

SQL> ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;

Database altered.

或者直接从视图里拼出语句

SQL> select event, status,'exec dbms_logstdby.skip_transaction ('||XIDUSN||', '||XIDSLT||', '||XIDSQN||');' from dba_logstdby_events where XIDUSN is not null;

EVENT STATUS


'EXECDBMS_LOGSTDBY.SKIP_TRANSACTION('||XIDUSN||','||XIDSLT||','||XIDSQN||');'
-------------------------------------------------------------------------------------------------------------------------------------------------------------------
insert into "SCOTT"."T" ORA-00001: unique constraint (SYS.IDX_SCOTT_T_1) violated
values
"USERNAME" = 'SYS',
"USER_ID" = 0,
"CREATED" = '17-SEP-11'
exec dbms_logstdby.skip_transaction (3, 3, 827);

。。。。。。。。。。。。。

还有一个办法,就是全同步单表

本人提供Oracle、MySQL、PG等数据库的培训和考证业务,私聊QQ646634621或微信db_bao,谢谢!

1 在备库上创建到主库的dblink,要求dblink在主库那边的用户能够读表、锁表及SELECT_CATALOG_ROLE

create database link dg_orcl connect to system identified by oracle using 'dg_orcl';

2 调用存储过程

exec dbms_logstdby.instantiate_table('SCOTT', 'T', 'DG_ORCL');



86 DBMS_LOGSTDBYThe DBMS_LOGSTDBY package provides subprograms for configuring and managing the logical standby database environment.See Also: for more information about SQL Apply and logical standby databasesThis chapter contains the following topics:Using DBMS_LOGSTDBYOverviewSecurity ModelSummary of DBMS_LOGSTDBY SubprogramsUsing DBMS_LOGSTDBYThis section contains topics which relate to using the DBMS_LOGSTDBY package.OverviewSecutity ModelOverviewThe DBMS_LOGSTDBY package helps you manage the SQL Apply (logical standby database) environment. The subprograms in the DBMS_LOGSTDBY package help you to accomplish the following main objectives:Manage configuration parameters used by SQL Apply.For example, controlling how transactions are applied on the logical standby database, how much shared pool is used, and how many processes are used by SQL Apply to mine and apply the changes.Ensure an appropriate level of supplemental logging is enabled, and a LogMiner dictionary is built correctly for logical standby database creation.Provide a way to skip the application of changes to selected tables or entire schemas in the logical standby database, and specify ways to handle exceptions encountered by SQL Apply.Allow controlled access to tables in the logical standby database that may require maintenance.Secutity ModelYou must have the DBA role to use the DBMS_LOGSTDBY package.A prototype role, LOGSTDBY_ADMINISTRATOR, is created by default with RESOURCE, and EXECUTE privileges on DBMS_LOGSTDBY. If you choose to use this role, consider granting ALTER DATABASE andALTER SESSION privileges to the role so that the grantee can start and stop SQL Apply and can enable and disable the database guard.The procedures associated with skipping transactions (SKIP and UNSKIP, SKIP_ERROR and UNSKIP_ERROR, and SKIP_TRANSACTION and UNSKIP_TRANSACTION) all require DBA privileges to execute because their scope may contain wildcard schemas. Oracle recommends that where SKIP procedures are specified, these be owned by a secure account with appropriate privileges on the schemas they act on (for example, SYS).Summary of DBMS_LOGSTDBY SubprogramsTable 86-1 DBMS_LOGSTDBY Package SubprogramsSubprogramDescriptionAPPLY_SET ProcedureSets the values of various parameters that configure and maintain SQL ApplyAPPLY_UNSET ProcedureRestores the default values of various parameters that configure and maintain SQL ApplyBUILD ProcedureEnsures supplemental logging is enabled properly and builds the LogMiner dictionaryINSTANTIATE_TABLE ProcedureCreates and populates a table in the standby database from a corresponding table in the primary databaseIS_APPLY_SERVER FunctionThis function returns TRUE if it is executed from PL/SQL in the context of a logical standby apply server process. This function is used in conjunction with triggers that have the fire_onceparameter in the DBMS_DDL.SET_TRIGGER_FIRING_PROPERTY subprogram set to FALSE (the default is TRUE). Such triggers are executed when the relevant target is updated by an apply process. This function can be used within the body of the trigger to ensure that the trigger takes different (or no) actions on the primary or on the standby.MAP_PRIMARY_SCN FunctionMaps an SCN relevant to the primary database to a corresponding SCN at the logical standby database. The mapped SCN is conservative in nature, and can thus be used to flash back the logical standby database to compensate for a flashback database operation performed at the primary database.PREPARE_FOR_NEW_PRIMARY ProcedureUsed after a failover, this procedure ensures a local logical standby database that was not involved in the failover has not processed more redo than the new primary database and reports the set of archive redo log files that must be replaced to ensure consistencyPURGE_SESSION ProcedureIdentifies the archived redo log files that have been applied to the logical standby database and are no longer needed by SQL ApplyREBUILD ProcedureRecords relevant metadata (including the LogMiner dictionary) in the redo stream in case a database that has recently changed its role to a primary database following a failover operation fails to do so during the failover processSET_TABLESPACE ProcedureMoves metadata tables required by SQL Apply to the user-specified tablespace. By default, the metadata tables are created in the SYSAUX tablespace.SKIP ProcedureSpecifies rules that control database operations that should not be applied to the logical standby databaseSKIP_ERROR ProcedureSpecifies rules regarding what action to take upon encountering errorsSKIP_TRANSACTION ProcedureSpecifies transactions that should not be applied on the logical standby database. Be careful in using this procedure, because not applying specific transactions may cause data corruption at the logical standby database.UNSKIP ProcedureDeletes rules specified by the SKIP procedureUNSKIP_ERROR ProcedureDeletes rules specified by the SKIP_ERROR procedureUNSKIP_TRANSACTION ProcedureDeletes rules specified by the SKIP_TRANSACTION procedure
APPLY_SET ProcedureUse this procedure to set values of parameters that configure and manage SQL Apply in a logical standby database environment. All parameters, except for PRESERVE_COMMIT_ORDER, can be changed without having to stop SQL Apply.SyntaxDBMS_LOGSTDBY.APPLY_SET ( inname IN VARCHAR, value IN VARCHAR); ParametersTable 86-2 APPLY_SET Procedure ParametersParameterDescriptionAPPLY_SERVERSControls the number of APPLIER processes used to apply changes. The maximum number allowed is 1024, provided the MAX_SERVERS parameter is set to accommodate this.EVENT_LOG_DESTControls where SQL Apply records the occurrence of an interesting event. It takes the following values:DEST_ALL - All events will be recorded in the DBA_LOGSTDBY_EVENTS view and in the alert log.DEST_EVENTS_TABLE - All events that contain information about user data will be recorded only in the DBA_LOGSTDBY_EVENTS view. This is the default value.For example, if SQL Apply receives an ORA-1403 error, the whole event is recorded in theDBA_LOGSTDBY_EVENTS view. Whereas, the alert log records only that SQL Apply stopped because of ORA-1403. No information regarding the user table or offending statement is logged in the alert log. However, if you stop the SQL Apply engine, it gets recorded in both theDBA_LOGSTDBY_EVENTS view and in the alert log.Note that this parameter affects the behavior of the following parameters:RECORD_APPLIED_DDL, RECORD_SKIP_DDL, RECORD_SKIP_ERRORS, andRECORD_UNSUPPORTED_OPERATIONS. For example, if RECORD_APPLIED_DDL is set to TRUE, butEVENT_LOG_DEST is set to DEST_EVENTS_TABLE, then the applied DDL string will only be recorded in the DBA_LOGSTDBY_EVENTS view.LOG_AUTO_DEL_RETENTION_TARGETThis parameter setting is only meaningful if LOG_AUTO_DELETE has been set to TRUE. The value you supply for this parameter controls how long (in minutes) a remote archived log that is received from the primary database will be retained at the logical standby database once all redo records contained in the log have been applied at the logical standby database. The default value is 1440 minutes.LOG_AUTO_DELETEAutomatically deletes foreign archived redo log files as soon as they have been applied on the logical standby database. By default, a foreign archived redo log file is not deleted until 24 hours (the default value of LOG_AUTO_DEL_RETENTION_TARGET parameter) after it has been applied at the logical standby database. Set to TRUE to enable automatic deletion of archived redo log files. Set to FALSE to disable automatic deletion. The default value is TRUE.MAX_EVENTS_RECORDEDNumber of recent events that will be visible through the DBA_LOGSTDBY_EVENTS view. To record all events encountered by SQL Apply, use the DBMS_LOGSTDBY.MAX_EVENTS constant as the number value. The default value is 10,000.MAX_SERVERSNumber of processes that SQL Apply uses to read and apply redo. The default value is 9. The maximum number allowed is 2048.MAX_SGANumber of megabytes from shared pool in System Global Area (SGA) that SQL Apply will use. The default value is 30 megabytes or one quarter of the value set for SHARED_POOL_SIZE, whichever is lower. The maximum size allowed is 4095 megabytes.PREPARE_SERVERSControls the number of PREPARER processes used to prepare changes. The maximum number allowed is 1024, provided the MAX_SERVERS parameter is set to accommodate this.PRESERVE_COMMIT_ORDERTRUE: Transactions are applied to the logical standby database in the exact order in which they were committed on the primary database. This is the default parameter setting.FALSE: Transactions containing non-overlapping sets of rows may be committed in a different order than they were committed on the primary database.Regardless of the level chosen, modifications done to the same row are always applied in the same order as they happened on the primary database. See the Usage Notes for details and recommendations.You cannot modify this parameter while SQL Apply is running.RECORD_APPLIED_DDLControls whether DDL statements that have been applied to the logical standby database are recorded in the location specified by the EVENT_LOG_DEST parameter. Specify one of the following values:TRUE: Indicates that DDL statements applied to the logical standby database are recorded in theDBA_LOGSTDBY_EVENTS table and the alert log.FALSE: Indicates that applied DDL statements are not recorded. This is the default parameter setting.RECORD_SKIP_DDLControls whether skipped DDL statements are recorded in the location specified by theEVENT_LOG_DEST parameter. Specify one of the following values:TRUE: Skipped DDL statements are recorded in the DBA_LOGSTDBY_EVENTS table and the alert log. This is the default parameter setting.FALSE: Skipped DDL statements are not recorded in the DBA_LOGSTDBY_EVENTS table and the alert log.RECORD_SKIP_ERRORSControls whether skipped errors (as described by the SKIP_ERROR procedure) are recorded in the location specified by the EVENT_LOG_DEST parameter. Specify one of the following values:TRUE: Skipped errors are recorded in the DBA_LOGSTDBY_EVENTS table and the alert log. This is the default parameter setting.FALSE: Skipped errors are not recorded in the DBA_LOGSTDBY_EVENTS table and the alert log.RECORD_UNSUPPORTED_OPERATIONSCaptures information about transactions running on the primary database that will not be supported by a logical standby database. This procedure records its information as events in theDBA_LOGSTDBY_EVENTS table. Specify one of the following values:TRUE: The information is captured and recorded as events in the DBA_LOGSTDBY_EVENTS table.FALSE: The information is not captured. This is the default.
If a parameter is changed while SQL Apply is running, the change will take effect at some point in the future. In such a case, an informational row is inserted into the DBA_LOGSTDBY_EVENTS view at the time the parameter change takes effect.Additionally, if you are modifying a parameter while SQL Apply is running on an Oracle RAC configuration, you must be connected to the same instance where SQL Apply is running.ExceptionsTable 86-3 APPLY_SET Procedure ExceptionsExceptionDescriptionORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requestedORA-16236Logical Standby metadata operation in progress
Usage NotesUse the APPLY_UNSET procedure to restore the default settings of a parameter.See for help with tuning SQL Apply and for information about setting appropriate values for different parameters.ExamplesTo record DDLs in the DBA_LOGSTDBY_EVENTS view and in the alert log, issue the following statement:SQL> EXECUTE DBMS_LOGSTDBY.APPLY_SET('RECORD_APPLIED_DDL', TRUE); APPLY_UNSET ProcedureUse the APPLY_UNSET procedure to restore the default values of the parameters that you changed with the APPLY_SET procedure.SyntaxDBMS_LOGSTDBY.APPLY_UNSET ( inname IN VARCHAR); ParametersThe parameter information for the APPLY_UNSET procedure is the same as that described for the APPLY_SET procedure. See Table 86-2 for complete parameter information.ExceptionsTable 86-4 APPLY_UNSET Procedure ExceptionsExceptionDescriptionORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requestedORA-16236Logical Standby metadata operation in progress
Usage NotesUse the APPLY_SET procedure to specify a nondefault value for a parameter.ExamplesIf you previously specified that applied DDLs show up in the DBA_LOGSTDBY_EVENTS view and the alert log, you can restore the default behavior of SQL Apply regarding applied DDL statements with the following statement:SQL> EXECUTE DBMS_LOGSTDBY.APPLY_UNSET('RECORD_APPLIED_DDL'); BUILD ProcedureUse this procedure on the primary database to record relevant metadata (LogMiner dictionary) information in the redo log, which will subsequently be used by SQL Apply. This procedure will enable database-wide primary- and unique-key supplemental logging, if necessary.Note:In databases created using Oracle Database 11g release 2 (11.2) or later, supplemental logging information is automatically propagated to any existing physical standby databases. However, for databases in earlier releases, or if the database was created using an earlier release and then upgraded to 11.2, you must check whether supplemental logging is enabled at the physical standby(s) if it is also enabled at the primary database. If it is not enabled at the physical standby(s), then before performing a switchover or failover, you must enable supplemental logging on all existing physical standby databases. To do so, issue the following SQL command on each physical standby:SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA (PRIMARY KEY, UNIQUE INDEX) COLUMNS; If you do not do this, then any logical standby that is also in the same Data Guard configuration will be unusable if a switchover or failover is performed to one of the physical standby databases. If a switchover or failover has already occurred and supplemental logging was not enabled, then you must recreate all logical standby databases.SyntaxDBMS_LOGSTDBY.BUILD; Usage NotesSupplemental log information includes extra information in the redo logs that uniquely identifies a modified row in the logical standby database, and also includes information that helps efficient application of changes to the logical standby database.LogMiner dictionary information allows SQL Apply to interpret data in the redo logs.DBMS_LOGSTDBY.BUILD should be run only once for each logical standby database you want to create. You do not need to use DBMS_LOGSTDBY.BUILD for each Oracle RAC instance.DBMS_LOGSTDBY.BUILD waits for all transactions (including distributed transactions) that are active at the time of the procedure invocation to complete before returning. See for information about how to handle in-doubt transactions.ExamplesTo build the LogMiner dictionary in the redo stream of the primary database and to record additional information so that a logical standby database can be instantiated, issue the following SQL statement at the primary databaseSQL> EXECUTE DBMS_LOGSTDBY.BUILD; INSTANTIATE_TABLE ProcedureThis procedure creates and populates a table in the standby database from a corresponding table in the primary database. The table requires the name of the database link (dblink) as an input parameter. If the table already exists in the logical standby database, it will be dropped and re-created based on the table definition at the primary database. This procedure only brings over the data associated with the table, and not the associated indexes and constraints.Use the INSTANTIATE_TABLE procedure to:Add a table to a standby database.Re-create a table in a standby database.SyntaxDBMS_LOGSTDBY.INSTANTIATE_TABLE ( schema_name IN VARCHAR2, table_name IN VARCHAR2, dblink IN VARCHAR2); ParametersTable 86-5 INSTANTIATE_TABLE Procedure ParametersParameterDescriptionschema_nameName of the schematable_nameName of the table to be created or re-created in the standby databasedblinkName of the database link account that has privileges to read and lock the table in the primary database, as well as the SELECT_CATALOG_ROLE on the primary database
ExceptionsTable 86-6 INSTANTIATE_TABLE Procedure ExceptionsExceptionDescriptionORA-16103Logical Standby apply must be stopped to allow this operationORA-16236Logical Standby metadata operation in progressORA-16276Specified database link does not correspond to primary databaseORA-16277Specified table is not supported by logical standby databaseORA-16278Specified table has a multi-object skip rule defined
Usage NotesUse this procedure to create and populate a table in a way that keeps the data on the standby database transactionally consistent with the primary database.This table will not be synchronized with the rest of the tables being maintained by SQL Apply and SQL Apply will not start to maintain it until SQL Apply encounters redo that occurred after the table was instantiated from the primary. The SCN at which the table was instantiated from the primary database is available in the DBA_LOGSTDBY_EVENTS view.The specified table must be a table that is supported by logical standby (that is, it does not appear in the DBA_LOGSTDBY_UNSUPPORTED_TABLES view on the primary database).If there are any skip rules that specifically name this table (without any wildcards), those skip rules will be dropped as part of INSTANTIATE_TABLE, so that the table will be properly maintained by SQL Apply in the future. If there are skip rules that indirectly reference this table (match a skip rule with a wildcard in the schema_name or table_name, and have a TABLE, DML, or SCHEMA_DDL statement type), INSTANTIATE_TABLE will fail with an ORA-16278 error. Any multiobject skip rules that pertain to the table must be dropped or changed before re-attempting theINSTANTIATE_TABLE call.ExamplesSQL> EXECUTE DBMS_LOGSTDBY.INSTANTIATE_TABLE (- SCHEMA_NAME => 'HR', TABLE_NAME => 'EMPLOYEES', - DBLINK => 'INSTANTIATE_TBL_LINK'); IS_APPLY_SERVER FunctionThis function returns TRUE if it is executed from PL/SQL in the context of a logical standby apply server process. This function is used in conjunction with triggers that have the fire_once parameter in the DBMS_DDL.SET_TRIGGER_FIRING_PROPERTY subprogram set to FALSE (the default is TRUE). Such triggers are executed when the relevant target is updated by an apply process. This function can be used within the body of the trigger to ensure that the trigger takes different (or no) actions on the primary or on the standby.See Also:Oracle Database PL/SQL Packages and Types Reference for more information about the DBMS_DDL.SET_TRIGGER_FIRING_PROPERTY subprogram.SyntaxDBMS_LOGSTDBY.IS_APPLY_SERVER RETURN BOOLEAN; ParametersNoneMAP_PRIMARY_SCN FunctionReturns an SCN on the standby that predates the supplied SCN from the primary database by at least 5 minutes. This function can be used to determine a safe SCN to use in a compensating flashback database operation at the logical standby database, following a flashback database operation or a point-in-time recovery operation at the primary database.SyntaxDBMS_LOGSTDBY.MAP_PRIMARY_SCN(primary_scn NUMBER) RETURN NUMBER; ExceptionsTable 86-7 MAP_PRIMARY_SCN Function ExceptionsExceptionDescriptionORA-20001Primary SCN is before mapped rangeORA-20002SCN mapping requires PRESERVE_COMMIT_ORDER to be TRUE
Usage NotesUse this function to get a conservative SCN at the logical standby database that corresponds to an SCN at the primary database. This function is useful in the context of doing compensating flashback database operations at the logical standby following a flashback database or a point-in-time recovery operation done at the primary database.PREPARE_FOR_NEW_PRIMARY ProcedureThe PREPARE_FOR_NEW_PRIMARY procedure must be invoked at a logical standby database following a failover if that standby database was not the target of the failover operation. Such a standby database must process the exact same set of redo logs processed at the new primary database. This routine ensures that the local logical standby database has not processed more redo than the new primary database and reports the set of archive logs that must be replaced to ensure consistency. The set of replacement logs will be reported in the alert.log. These logs must be copied to the logical standby and registered using the ALTER DATABASE REGISTER LOGICAL LOGFILE statement.SyntaxDBMS_LOGSTDBY.PREPARE_FOR_NEW_PRIMARY ( FORMER_STANDBY_TYPE IN VARCHAR2, DBLINK IN VARCHAR2); ParametersTable 86-8 PREPARE_FOR_NEW_PRIMARY Procedure ParametersParameterDescriptionFORMER_STANDBY_TYPEThe type of standby database that was the target of the failover operation to become the new primary database. Valid values are 'PHYSICAL' if the new primary was formerly a physical standby, and 'LOGICAL' if the new primary database was formerly a logical standby database.DBLINKThe name of a database link to the new primary database
ExceptionsTable 86-9 PREPARE_FOR_NEW_PRIMARY Procedure ExceptionsExceptionDescriptionORA-16104Invalid Logical Standby option.ORA-16109Failed to apply log data from previous primary.
Usage NotesThis routine is intended only for logical standby systems.This routine will fail if the new primary database was formerly a logical standby database and the LogMiner dictionary build has not completed successfully.Log files displayed in the alert log will be referred to as terminal logs. Users should keep in mind that file paths are relative to the new primary database and may not resolve locally.Upon manual registration of the terminal logs, users should complete the process by calling either START LOGICAL STANDBY APPLY if the new primary database was formerly a physical standby database or START LOGICAL STANDBY APPLY NEW PRIMARY if the new primary database was formerly a logical standby database.See the alert log for more details regarding the reasons for any exception.ExamplesSQL> EXECUTE DBMS_LOGSTDBY.PREPARE_FOR_NEW_PRIMARY ( - FORMER_STANDBY_TYPE => 'LOGICAL', - DBLINK => 'dblink_to_newprimary'); PURGE_SESSION ProcedureIdentifies all archived redo log files that have been applied to the logical standby database and are no longer needed by SQL Apply. Once identified, you can issue operating system commands to delete some or all of the unnecessary archived redo log files.SyntaxDBMS_LOGSTDBY.PURGE_SESSION; ExceptionsTable 86-10 PURGE_SESSION Procedure ExceptionsExceptionDescriptionORA-01309Invalid session
Usage NotesThis procedure does not delete the archived redo log files. You must issue operating system commands to delete unneeded files.This procedure updates the DBA_LOGMNR_PURGED_LOG view that displays the archived redo log files that have been applied to the logical standby database.In Oracle Database 10g Release 2, metadata related to the archived redo log files (and the actual archived redo log files) are purged automatically based on the default setting of theLOG_AUTO_DELETE parameter described in the DBMS_LOGSTDBY.APPLY_SET procedure described.ExampleTo identify and remove unnecessary files:Enter the following statement on the logical standby database:SQL> EXECUTE DBMS_LOGSTDBY.PURGE_SESSION; Query the DBA_LOGMNR_PURGED_LOG view to list the archived redo log files that can be removed:SQL> SELECT * FROM DBA_LOGMNR_PURGED_LOG; FILE_NAME ------------------------------------ /boston/arc_dest/arc_1_40_509538672.log /boston/arc_dest/arc_1_41_509538672.log /boston/arc_dest/arc_1_42_509538672.log /boston/arc_dest/arc_1_43_509538672.log /boston/arc_dest/arc_1_44_509538672.log /boston/arc_dest/arc_1_45_509538672.log /boston/arc_dest/arc_1_46_509538672.log /boston/arc_dest/arc_1_47_509538672.log Use operating system-specific commands to delete archived redo log files from the file system.REBUILD ProcedureThis procedure is used if a database that has recently changed its role to a primary database following a failover operation fails to record relevant metadata (including the LogMiner dictionary) in the redo stream required for other logical standby databases.SyntaxDBMS_LOGSTDBY.REBUILD; Usage NotesLogMiner dictionary information is logged in the redo log files.The standby redo log files (if present) are archived.ExamplesSQL> EXECUTE DBMS_LOGSTDBY.REBUILD; SET_TABLESPACE ProcedureMoves metadata tables required by SQL Apply to the user-specified tablespace. By default, the metadata tables are created in the SYSAUX tablespace. SQL Apply cannot be running when you invoke this procedure.SyntaxDBMS_LOGSTDBY.SET_TABLESPACE( NEW_TABLESPACE IN VARCHAR2) ParametersTable 86-11 SET_TABLE SPACE Procedure ParametersParameterDescriptionNEW_TABLESPACEName of the new tablespace where metadata tables will reside.
ExceptionsTable 86-12 SET_TABLESPACE Procedure ExceptionsExceptionDescriptionORA-16103Logical Standby apply must be stopped to allow this operationORA-16236Logical Standby metadata operation in progress
ExamplesTo move metadata tables to a new tablespace named LOGSTDBY_TBS, issue the following statement:SQL> EXECUTE DBMS_LOGSTDBY.SET_TABLESPACE (new_tablespace => 'LOGSTDBY_TBS'); SKIP ProcedureThe SKIP procedure can be used to define rules that will be used by SQL Apply to skip the application of certain changes to the logical standby database. For example, the SKIP procedure can be used to skip changes to a subset of tables in the logical standby database. It can also be used to specify DDL statements that should not be applied at the logical standby database or should be modified before they are applied in the logical standby database. One reason why a DDL statement may need to be modified is to accommodate a different directory structure on the logical standby database.SyntaxDBMS_LOGSTDBY.SKIP ( stmt IN VARCHAR2, schema_name IN VARCHAR2 DEFAULT NULL, object_name IN VARCHAR2 DEFAULT NULL, proc_name IN VARCHAR2 DEFAULT NULL, use_like IN BOOLEAN DEFAULT TRUE, esc IN CHAR1 DEFAULT NULL); ParametersTable 86-13 SKIP Procedure ParametersParameterDescriptionstmtEither a keyword that identifies a set of SQL statements or a specific SQL statement. The use of keywords simplifies configuration since keywords, generally defined by the database object, identify all SQL statements that operate on the specified object. Table 86-14 shows a list of keywords and the equivalent SQL statements, either of which is a valid value for this parameter.The keyword PL/SQL is used for the execution of Oracle-supplied packages which are supported for replication. See for information about supported packages.schema_nameThe name of one or more schemas (wildcards are permitted) associated with the SQL statements identified by the stmt parameter. If not applicable, this value must be set to NULL.object_nameThe name of one or more objects (wildcards are permitted) associated with the SQL statements identified by the stmt. If not applicable, this value must be set to NULL.proc_nameName of a stored procedure to call when SQL Apply determines that a particular statement matches the filter defined by the stmt, schema_name, and object_name parameters. Specify the procedure in the following format:'schema.package.procedure'This procedure returns a value that directs SQL Apply to perform one of the following: execute the statement, skip the statement, or execute a replacement statement.For DDLs, SQL Apply calls the stored procedure with the following call signature:IN STATEMENT VARCHAR2 -- The SQL statement that matches the filterIN STATEMENT_TYPE VARCHAR2 -- The stmt of the filterIN SCHEMA VARCHAR2 -- The schema_name of the filter, if applicableIN NAME VARCHAR2 -- The object_name of the filter, if applicableIN XIDUSN NUMBER -- Transaction ID part 1IN XIDSLT NUMBER -- Transaction ID part 2IN XIDSQN NUMBER -- Transaction ID part 3OUT SKIP_ACTION NUMBER -- Action to be taken by SQL Apply upon completion of this routine. Valid values are:SKIP_ACTION_APPLY -- Execute the statementSKIP_ACTION_SKIP -- Skip the statementSKIP_ACTION_ERROR -- Halt apply so the DBA can take appropriate steps (for example, take compensating action)SKIP_ACTION_REPLACE -- Execute the replacement statement supplied in theNEW_STATEMENT output parameterFor PL/SQL, SQL Apply calls the stored procedure with the following call signature:IN STATEMENT VARCHAR2 -- The SQL statement that matches the filterIN PACKAGE_SCHEMA VARCHAR2 -- The schema of the package being skipped (for example, SYS or XDB)IN PACKAGE_NAME VARCHAR2 -- The name of the package being skipped (for example,DBMS_RLS)IN PROCEDURE_NAME VARCHAR2 – The name of the procedure being skipped (for example, ADD_POLICY)IN CURRENT_SCHEMA VARCHAR2 – The name of the current schema in which the PL/SQL was executed on the primaryIN XIDUSN NUMBER – Transaction ID part 1IN XIDSLT NUMBER -- Transaction ID part 2IN XIDSQN NUMBER -- Transaction ID part 3IN EXIT_STATUS – 0 (Zero) if the PL/SQL succeeded on the primary, or 1proc_name (cont.)OUT SKIP_ACTION NUMBER -- Action to be taken by SQL Apply upon completion of this routine. Valid return values are:SKIP_ACTION_APPLY -- Execute the statementSKIP_ACTION_APPLY -- Execute the statementSKIP_ACTION_ERROR – Raise an error which halts apply so that the DBA can take appropriate stepsNote 1: SKIP_ACTION_REPLACE is not supported for PL/SQL.Note 2: SQL Apply calls the skip handler when the procedure's exit is processed.Note 3: The use_like parameter must be set to FALSE for PL/SQL since wildcarding PL/SQL is not supported.The following example shows how to have a conditional skip rule on DBMS_RLS.DROP_POLICY:Create or replace procedure sec_mgr.skip_drop_policy ( statement in varchar2, pkgown in varchar2, pkgname in varchar2, procnm in varchar2, cuser in varchar2, xidusn in number, xidslt in number, xidsqn in number, exstatus in number, skip_action out number) Is Begin If 0 = exstatus Then Insert Into sec_mgr.logit Values ('Success: '||pkgown||'.'||pkgname||'.'||procnm|| ' by '||cuser); If cuser != 'TESTSCHEMA' Then skip_action := DBMS_LOGSTDBY.SKIP_ACTION_APPLY; Else skip_action := DBMS_LOGSTDBY.SKIP_ACTION_SKIP; End If; End If; End skip_drop_policy; EXECUTE DBMS_LOGSTDBY.SKIP( - stmt => 'PL/SQL', - schema_name => 'SYS', - object_name => 'DBMS_RLS.DROP_POLICY', - proc_name => 'SEC_MGR.SKIP_DROP_POLICY' - use_like=> FALSE); use_likeAllows pattern matching to isolate the tables that you want to skip on the logical standby database. The uselike parameter matches a portion of one character value to another by searching the first value for the pattern specified by the second, and calculates strings using characters as defined by the input character set. This parameter follows the same rules for pattern matching described in the .escIdentifies an escape character (such as the character "/") that you can use for pattern matching. If the escape character appears in the pattern before the character "%" or "" then Oracle interprets this character literally in the pattern, rather than as a special pattern matching character. See for more information about pattern matching.
Usage NotesThis procedure requires DBA privileges to execute.You cannot associate a stored procedure to be invoked in the context of a DML statement. For example, the following statement returns the ORA-16104: invalid Logical Standby option requested error:SQL> EXECUTE DBMS_LOGSTDBY.SKIP(- stmt => 'DML', - schema_name => 'HR', - object_name => 'EMPLOYEES', - proc_name => 'DML_HANDLER'); Also, if an event matches multiple rules either because of the use of wildcards while specifying the rule or because of a specification of overlapping rules. For example, if you specify a rule for the SCHEMA_DDL event for the HR.EMPLOYEES table, and a rule for the ALTER TABLE event for the HR.EMPLOYEES table, only one of the matching procedures will be invoked (alphabetically, by procedure). In the following code example, consider the following rules:SQL> EXECUTE DBMS_LOGSTDBY.SKIP( - stmt => 'SCHEMA DDL', - schema_name => 'HR', - object_name => 'EMPLOYEES', - proc_name => 'SCHEMA_DDL_HANDLER'); SQL> EXECUTE DBMS_LOGSTDBY.SKIP( - stmt => 'ALTER TABLE', - schema_name => 'HR', - object_name => 'EMPLOYEES', - proc_name => 'TABLE_ALTER_HANDLER'); On encountering an ALTER TABLE statement, the schema_ddl_handler procedure will be invoked because its name will be at the top of an alphabetically sorted list of procedures that are relevant to the statement.Collisions on a rule set because of a specification containing wildcard entries are resolved in a similar fashion. For example, the rules in the following example will result in the empddl_handler procedure being invoked upon encountering the ALTER TABLE HR.EMPLOYEES ADD COLUMN RATING NUMBER statement:SQL> EXECUTE DBMS_LOGSTDBY.SKIP(- stmt => 'ALTER TABLE', - schema_name => 'HR', - object_name => 'EMP%', - proc_name => 'EMPDDL_HANDLER'); SQL> EXECUTE DBMS_LOGSTDBY.SKIP( - stmt => 'ALTER TABLE', - schema_name => 'HR', - object_name => 'EMPLOYEES', - proc_name => 'EMPLOYEE_DDL_HANDLER'); Use the SKIP procedure with caution, particularly when skipping DDL statements. If a CREATE TABLE statement is skipped, for example, you must also specify other DDL statements that refer to that table in the SKIP procedure. Otherwise, the statements will fail and cause an exception. When this happens, SQL Apply stops running.Before calling the SKIP procedure, SQL Apply must be halted. Do this by issuing an ALTER DATABASE STOP LOGICAL STANDBY APPLY statement. Once all desired filters have been specified, issue an ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE statement to start SQL Apply using the new filter settings.See the UNSKIP procedure for information about reversing (undoing) the settings of the SKIP procedure.For USER statements, the SCHEMA_NAME parameter will be the user and specify '%' for the OBJECT_NAME parameter.If the PROC_NAME parameter is supplied, it must already exist in DBA_PROCEDURES and it must execute with DEFINER rights. If the procedure is declared with INVOKER rights, the ORA-1031: insufficient privileges message will be returned.If the procedure returns a REPLACEMENT statement, the REPLACEMENT statement will be executed using the SYSTEM and OBJECT privileges of the owner of the procedure.The PL/SQL block of a SKIP procedure cannot contain transaction control statements (for example, COMMIT, ROLLBACK, SAVEPOINT, and SET CONSTRAINT) unless the block is declared to be an autonomous transaction.Skip Statement OptionsTable 86-14 lists the supported values for the stmt parameter of the SKIP procedure. The left column of the table lists the keywords that may be used to identify the set of SQL statements to the right of the keyword. In addition, any of the SQL statements listed in the sys.audit_actions table (shown in the right column of Table 86-14) are also valid values. Note that keywords are generally defined by database object.Table 86-14 Supported Values for the stmt ParameterKeywordAssociated SQL StatementsThere is no keyword for this group of SQL statements.GRANT REVOKE ANALYZE TABLE ANALYZE INDEX ANALYZE CLUSTER CLUSTERAUDIT CLUSTER CREATE CLUSTER DROP CLUSTER TRUNCATE CLUSTER CONTEXTCREATE CONTEXT DROP CONTEXT DATABASE LINKCREATE DATABASE LINK CREATE PUBLIC DATABASE LINK DROP DATABASE LINK DROP PUBLIC DATABASE LINK DIMENSIONALTER DIMENSION CREATE DIMENSION DROP DIMENSION DIRECTORYFoot 1 CREATE DIRECTORY DROP DIRECTORY DMLIncludes DML statements on a table (for example: INSERT, UPDATE, and DELETE)INDEXALTER INDEX CREATE INDEX DROP INDEX NON_SCHEMA_DDLAll DDL that does not pertain to a particular schemaNote: SCHEMA_NAME and OBJECT_NAME must be nullPL/SQLFoot 2 Execute Oracle-supplied package.PROCEDUREFoot 3 ALTER FUNCTION ALTER PACKAGE ALTER PACKAGE BODY ALTER PROCEDURE CREATE FUNCTION CREATE LIBRARY CREATE PACKAGE CREATE PACKAGE BODY CREATE PROCEDURE DROP FUNCTION DROP LIBRARY DROP PACKAGE DROP PACKAGE BODY DROP PROCEDURE PROFILEALTER PROFILE CREATE PROFILE DROP PROFILE ROLEALTER ROLE CREATE ROLE DROP ROLE SET ROLE ROLLBACK STATEMENTALTER ROLLBACK SEGMENT CREATE ROLLBACK SEGMENT DROP ROLLBACK SEGMENT SCHEMA_DDLAll DDL statements that create, modify, or drop schema objects (for example: tables, indexes, and columns)Note: SCHEMA_NAME and OBJECT_NAME must not be nullSEQUENCEALTER SEQUENCE CREATE SEQUENCE DROP SEQUENCE SYNONYMCREATE PUBLIC SYNONYM CREATE SYNONYM DROP PUBLIC SYNONYM DROP SYNONYM SYSTEM AUDITAUDIT SQL_statements NOAUDIT SQL_statements TABLECREATE TABLE ALTER TABLE DROP TABLE TRUNCATE TABLE TABLESPACECREATE TABLESPACE DROP TABLESPACE ALTER TABLESPACE TRIGGERALTER TRIGGER CREATE TRIGGER DISABLE ALL TRIGGERS DISABLE TRIGGER DROP TRIGGER ENABLE ALL TRIGGERS ENABLE TRIGGER TYPEALTER TYPE ALTER TYPE BODY CREATE TYPE CREATE TYPE BODY DROP TYPE DROP TYPE BODY USERALTER USER CREATE USER DROP USER VIEWCREATE VIEW DROP VIEW VIEWCREATE VIEW DROP VIEW
Footnote 1 All directory objects are owned by SYS, but for the purpose of filtering them with a skip directive the schema should be specified as '%'".Footnote 2 See for information about supported packages.Footnote 3 Java schema objects (sources, classes, and resources) are considered the same as procedure for purposes of skipping (ignoring) SQL statements.ExceptionsTable 86-15 DBMS_LOGSTDBY.SKIP Procedure ExceptionsExceptionDescriptionORA-01031Insufficient privileges:Procedure used INVOKER rightsProcedure needs DBA privilegesORA-16103Logical standby apply must be stopped to allow this operation.ORA-16104Invalid logical standby option requested.ORA-16203"Unable to interpret SKIP procedure return values."Indicates that a SKIP procedure has either generated an exception or has returned ambiguous values. You can identify the offending procedure by examining the DBA_LOGSTDBY_EVENTS view.ORA-16236Logical standby metadata operation in progress.
ExamplesExample 1 Skipping all DML and DDL changes made to a schemaThe following example shows how to specify rules so that SQL Apply will skip both DDL and DML statements made to the HR schema.SQL> EXECUTE DBMS_LOGSTDBY.SKIP(STMT => 'SCHEMA DDL', - schema_name => 'HR', - object_name => '%', - proc_name => null); SQL> EXECUTE DBMS_LOGSTDBY.SKIP(STMT => 'DML', - schema_name => 'HR', - object_name => '%', - proc_name => null); Example 2 Creating a procedure to handle different file system organizationFor example, if the file system organization in the logical standby database is different than that in the primary database, you can write a SKIP procedure to handle DDL statements with file specifications transparently.The following procedure can handle DDL statements as long as you follow a specific naming convention for the file specification string.Create the SKIP procedure to handle tablespace DDL statements:CREATE OR REPLACE PROCEDURE sys.handle_tbs_ddl ( old_stmt IN VARCHAR2, stmt_typ IN VARCHAR2, schema IN VARCHAR2, name IN VARCHAR2, xidusn IN NUMBER, xidslt IN NUMBER, xidsqn IN NUMBER, action OUT NUMBER, new_stmt OUT VARCHAR2 ) AS BEGIN -- All primary file specification that contains a directory -- /usr/orcl/primary/dbs -- should go to /usr/orcl/stdby directory specification new_stmt = replace(old_stmt, '/usr/orcl/primary/dbs', '/usr/orcl/stdby'); action := DBMS_LOGSTDBY.SKIP_ACTION_REPLACE; EXCEPTION WHEN OTHERS THEN action := DBMS_LOGSTDBY.SKIP_ACTION_ERROR; new_stmt := NULL; END handle_tbs_ddl; Register the SKIP procedure with SQL Apply:SQL> EXECUTE DBMS_LOGSTDBY.SKIP (stmt => 'TABLESPACE', - proc_name => 'SYS.HANDLE_TBS_DDL'); SKIP_ERROR ProcedureUpon encountering an error, the logical standby database uses the criteria contained in this procedure to determine a course of action. The default action when a match is found is to skip the error and continue with applying changes. However, if a procedure is supplied, then SKIP_ERROR can take other actions depending on the situation. It can do nothing, which causes SQL Apply to stop, or it can change the error message text and stop SQL Apply, or it can actually skip the error.SyntaxDBMS_LOGSTDBY.SKIP_ERROR ( stmt IN VARCHAR2, schema_name IN VARCHAR2 DEFAULT NULL, object_name IN VARCHAR2 DEFAULT NULL, proc_name IN VARCHAR2 DEFAULT NULL, use_like IN BOOLEAN DEFAULT NULL, esc IN CHAR1 DEFAULT NULL); ParametersTable 86-16 SKIP_ERROR Procedure ParametersParameterDescriptionstmtEither a keyword that identifies a set of SQL statements or a specific SQL statement. The use of keywords simplifies configuration because keywords, generally defined by the database object, identify all SQL statements that operate on the specified object. Table 86-14 shows a list of keywords and the equivalent SQL statements, either of which is a valid value for this parameter.schema_nameThe name of one or more schemas (wildcards are permitted) associated with the SQL statements identified by the stmt parameter. If not applicable, this value must be set to NULL.object_nameThe name of one or more objects (wildcards are permitted) associated with the SQL statements identified by the stmt. If not applicable, this value must be set to NULL.proc_nameName of a stored procedure to call when SQL Apply encounters an error and determines a particular statement matches the filter defined by the stmt, schema_name, and object_nameparameters. Specify the procedure in the following format:'"schema"."package"."procedure"'This procedure returns an error message that directs SQL Apply to perform one of the following actions:Silently skip the error and continue with SQL ApplyReplace the error message that would have been created with a custom one, and stop SQL ApplyDo nothing, causing SQL Apply to stop and the original error message to be loggedSQL Apply calls the stored procedure with the following call signature:IN STATEMENT VARCHAR(4000) -- The first 4K of the statementIN STATEMENT_TYPE VARCHAR2 -- The stmt of the filterIN SCHEMA VARCHAR2 -- The schema_name of the filter, if applicableIN NAME VARCHAR2 -- The object_name of the filter, if applicableIN XIDUSN NUMBER -- Transaction ID part 1IN XIDSLT NUMBER -- Transaction ID part 2IN XIDSQN NUMBER -- Transaction ID part 3IN ERROR VARCHAR(4000) -- Text of the original error to be recordedOUT NEW_ERROR VARCHAR(4000) -- Null or modified error textuse_likeAllows pattern matching to isolate the tables that you want to skip on the logical standby database. The uselike parameter matches a portion of one character value to another by searching the first value for the pattern specified by the second, and calculates strings using characters as defined by the input character set. This parameter follows the same rules for pattern matching described in the .escIdentifies an escape character (such as the characters "%" or "") that you can use for pattern matching. If the escape character appears in the pattern before the character "%" or "_" then Oracle interprets this character literally in the pattern, rather than as a special pattern matching character. See for more information about pattern matching.
Usage NotesA stored procedure provided to the SKIP_ERROR procedure is called when SQL Apply encounters an error that could shut down the application of redo logs to the standby database.Running this stored procedure affects the error being written in the STATUS column of the DBA_LOGSTDBY_EVENTS table. The STATUS_CODE column remains unchanged. If the stored procedure is to have no effect, that is, apply will be stopped, then the NEW_ERROR is written to the events table. To truly have no effect, set NEW_ERROR to ERROR in the procedure.If the stored procedure requires that a shutdown be avoided, then you must set NEW_ERROR to NULL.This procedure requires DBA privileges to execute.For USER statements, the SCHEMA_NAME parameter will be the user and you should specify '%' for the OBJECT_NAME parameter.If the PROC_NAME parameter is specified, it must already exist in DBA_PROCEDURES and it must execute with DEFINERS rights. If the procedure is declared with INVOKERS rights, the ORA-1031: insufficient privileges message will be returned.The PL/SQL block of a SKIP_ERROR procedure cannot contain transaction control statements (for example: COMMIT, ROLLBACK, SAVEPOINT, and SET CONSTRAINT) unless the block is declared to be an autonomous transaction using the following syntax:PRAGMA AUTONOMOUS_TRANSACTION ExceptionsTable 86-17 SKIP_ERROR Procedure ExceptionsExceptionDescriptionORA-01031Insufficient privileges:Procedure used INVOKER rightsProcedure needs DBA privilegesORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requestedORA-16236Logical Standby metadata operation in progress
Example 1The following example shows how to specify rules so that SQL Apply will skip any error raised from any GRANT DDL command.SQL> EXECUTE DBMS_LOGSTDBY.SKIP_ERROR('GRANT') Example 2To skip errors on GRANT statements on SYS or HR schemas, define a procedure handle_error_ddl and register it. In the following example, assume that handle_error_ddl is a free-standing procedure in the SYS schema.Create the error-handler procedure:CREATE OR REPLACE PROCEDURE sys.handle_error_ddl ( old_stmt IN VARCHAR2, stmt_type IN VARCHAR2, schema IN VARCHAR2, name IN VARCHAR2, xidusn IN NUMBER, xidslt IN NUMBER, xidsqn IN NUMBER, error IN VARCHAR2, new_error OUT VARCHAR2 ) AS BEGIN -- Default to what we already have new_error := error; -- Ignore any GRANT errors on SYS or HR schemas IF INSTR(UPPER(old_stmt),'GRANT') > 0 THEN IF schema IS NULL OR (schema IS NOT NULL AND (UPPER(schema) = 'SYS' OR UPPER(schema) = 'HR' ) THEN new_error := NULL; -- record the fact that we just skipped an error on 'SYS' or 'HR' schemas -- code not shown here END IF; END IF; END handle_error_ddl; / Register the error handler with SQL Apply:SQL> EXECUTE DBMS_LOGSTDBY.SKIP_ERROR ( - statement => 'NON_SCHEMA_DDL', - schema_name => NULL, - object_name => NULL, - proc_name => 'SYS.HANDLE_ERROR_DDL'); SKIP_TRANSACTION ProcedureThis procedure provides a way to skip (ignore) applying transactions to the logical standby database. You can skip specific transactions by specifying transaction identification information.SyntaxDBMS_LOGSTDBY.SKIP_TRANSACTION ( xidusn IN NUMBER, xidslt IN NUMBER, xidsqn IN NUMBER); ParametersTable 86-18 SKIP_TRANSACTION Procedure ParametersParameterDescriptionXIDUSN NUMBERTransaction ID undo segment number of the transaction being skippedXIDSLT NUMBERTransaction ID slot number of the transaction being skippedXIDSQN NUMBERTransaction ID sequence number of the transaction being skipped
Usage NotesIf SQL Apply stops due to a particular transaction (for example, a DDL transaction), you can specify that transaction ID and then continue to apply. You can call this procedure multiple times for as many transactions as you want SQL Apply to ignore.CAUTION:SKIP_TRANSACTION is an inherently dangerous operation. Do not invoke this procedure unless you have examined the transaction in question through the V$LOGMNR_CONTENTS view and have taken compensating actions at the logical standby database. SKIP_TRANSACTION is not the appropriate procedure to invoke to skip DML changes to a table.To skip a DML failure, use a SKIP procedure, such as SKIP('DML','MySchema','MyFailed Table'). Using the SKIP_TRANSACTION procedure for DML transactions may skip changes for other tables, thus logically corrupting them.This procedure requires DBA privileges to execute.Use the DBA_LOGSTDBY_SKIP_TRANSACTION view to list the transactions that are going to be skipped by SQL Apply.Also, see the ALTER DATABASE START LOGICAL STANDBY SKIP FAILED TRANSACTION statement in .ExceptionsTable 86-19 SKIP_TRANSACTION Procedure ExceptionsExceptionDescriptionORA-01031Need DBA privilegesORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requested
ExamplesTo skip a DDL transaction with (XIDUSN, XIDSLT, XIDSQN) of (1.13.1726) you can register a rule as shown in the following example:SQL> EXECUTE DBMS_LOGSTDBY.SKIP_TRANSACTION (- XIDUSN => 1, XIDSLT => 13, XIDSQN => 1726); UNSKIP ProcedureUse the UNSKIP procedure to delete rules specified earlier with the SKIP procedure. The parameters specified in the UNSKIP procedure must match exactly for it to delete an already-specified rule.SyntaxDBMS_LOGSTDBY.UNSKIP ( stmt IN VARCHAR2, schema_name IN VARCHAR2 DEFAULT NULL, object_name IN VARCHAR2 DEFUALT NULL); ParametersThe parameter information for the UNSKIP procedure is the same as that described for the SKIP procedure. See Table 86-13 for complete parameter information.ExceptionsTable 86-20 UNSKIP Procedure ExceptionsExceptionDescriptionORA-01031need DBA privileges to execute this procedureORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requested
Usage NotesCAUTION:If DML changes for a table have been skipped and not compensated for, you must follow the call to the UNSKIP procedure with a call to the INSTANTIATE_TABLE procedure to synchronize this table with those maintained by SQL Apply.This procedure requires DBA privileges to execute.Wildcards passed in the schema_name or the object_name parameter are not expanded. The wildcard character is matched at the character level. Thus, you can delete only one specified rule by invoking the UNSKIP procedure, and you will need a distinct UNSKIP procedure call to delete each rule that was previously specified.For example, assume you have specified the following two rules to skip applying DML statements to the HR.EMPLOYEE and HR.EMPTEMP tables:SQL> EXECUTE DBMS_LOGSTDBY.SKIP (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMPLOYEE', - PROC_NAME => null); SQL> EXECUTE DBMS_LOGSTDBY.SKIP (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMPTEMP', - PROC_NAME => null); In the following example, the wildcard in the TABLE_NAME parameter cannot be used to delete the rules that were specified:SQL> EXECUTE DBMS_LOGSTDBY.UNSKIP (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMP%'); In fact, this UNSKIP procedure matches neither of the rules, because the wildcard character in the TABLE_NAME parameter is not expanded. Instead, the wildcard character will be used in an exact match to find the corresponding SKIP rule.UNSKIP_ERROR ProcedureUse the UNSKIP_ERROR procedure to delete rules specified earlier with the SKIP_ERROR procedure. The parameters specified in the UNSKIP_ERROR procedure must match exactly for the procedure to delete an already-specified rule.SyntaxDBMS_LOGSTDBY.UNSKIP_ERROR ( stmt IN VARCHAR2, schema_name IN VARCHAR2 DEFAULT NULL, object_name IN VARCHAR2 DEFAULT NULL); ParametersThe parameter information for the UNSKIP_ERROR procedure is the same as that described for the SKIP_ERROR procedure. See Table 86-16 for complete parameter information.ExceptionsTable 86-21 UNSKIP_ERROR Procedure ExceptionsExceptionDescriptionORA-01031Need DBA privilegesORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requested
Usage NotesThis procedure requires DBA privileges to execute.Wildcards passed in the schema_name or the object_name parameters are not expanded. Instead, the wildcard character is treated as any other character and an exact match is made. Thus, you can delete only one specified rule by invoking the UNSKIP_ERROR procedure, and you need a distinct UNSKIP_ERROR procedure call to delete each rule that you previously specified.For example, assume you have specified the following two rules to handle the HR.EMPLOYEE and HR.EMPTEMP tables:SQL> EXECUTE DBMS_LOGSTDBY.SKIP_ERROR (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMPLOYEE', - PROC_NAME => 'hr_employee_handler'); SQL> EXECUTE DBMS_LOGSTDBY.SKIP_ERROR (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMPTEMP', - PROC_NAME => 'hr_tempemp_handler'); In this case, the following UNSKIP procedure cannot be used to delete the rules that you have specified:SQL> EXECUTE DBMS_LOGSTDBY.UNSKIP_ERROR (STMT => 'DML',- SCHEMA_NAME => 'HR', - OBJECT_NAME => 'EMP%'); In fact, the UNSKIP procedure will match neither of the rules, because the wildcard character in the OBJECT_NAME parameter will not be expanded.ExampleTo remove a handler that was previously registered with SQL Apply from getting called on encountering an error, you can issue the following statement:DBMS_LOGSTDBY.UNSKIP_ERROR ( - statement => 'NON_SCHEMA_DDL', - schema_name => NULL, - object_name => NULL); UNSKIP_TRANSACTION ProcedureUse the UNSKIP_TRANSACTION procedure to delete rules specified earlier with the SKIP_TRANSACTION procedure. The parameters specified in the UNSKIP_TRANSACTION procedure must match exactly for the procedure to delete an already-specified rule.SyntaxDBMS_LOGSTDBY.UNSKIP_TRANSACTION ( xidusn_p IN NUMBER, xidslt_p IN NUMBER, xidsqn_p IN NUMBER); ParametersTable 86-22 UNSKIP_TRANSACTION Procedure ParametersParameterDescriptionXIDUSNTransaction ID undo segment number of the transaction being skippedXIDSLTTransaction ID slot number of the transaction being skippedXIDSQNTransaction ID sequence number of the transaction being skipped
ExceptionsTable 86-23 UNSKIP_TRANSACTION Procedure ExceptionsExceptionDescriptionORA-01031need DBA privileges to execute this procedureORA-16103Logical Standby apply must be stopped to allow this operationORA-16104invalid Logical Standby option requested
Usage NotesThis procedure requires DBA privileges to execute.Query the DBA_LOGSTDBY_SKIP_TRANSACTION view to list the transactions that are going to be skipped by SQL Apply.ExamplesTo remove a rule that was originally specified to skip the application of a transaction with (XIDUSN, XIDSLT, XIDSQN) of (1.13.1726) issue the following statement:SQL> DBMS_LOGSTDBY.UNSKIP_TRANSACTION (XIDUSN => 1, XIDSLT => 13, XIDSQN => 1726);



在使用logical standby时,可以使用DBMS_LOGSTDBY.SKIP来不复制某些特定的objects。

但是,如果我们希望不复制以'XXX'开头的表,但保留以'XXX'开头的表,由于''代表任意字符,所以如果我们这样skip:

EXECUTE DBMS_LOGSTDBY.SKIP (stmt => 'DML', schema_name => 'MYSCHEMA', objectname => 'XXX%', proc_name => null);

这样的写法其实会连以'XXX'开头的表都被skip掉。

这时,我们可以使用DBMS_LOGSTDBY.SKIP的ESC参数来制定转义符。

PROCEDURE SKIP
Argument Name Type In/Out Default?


STMT VARCHAR2 IN
SCHEMA_NAME VARCHAR2 IN DEFAULT
OBJECT_NAME VARCHAR2 IN DEFAULT
PROC_NAME VARCHAR2 IN DEFAULT
USE_LIKE BOOLEAN IN DEFAULT
ESC CHAR(1) IN DEFAULT

escIdentifies an escape character (such as the character "/") that you can use for pattern matching. If the escape character appears in the pattern before the character "%" or "_" then Oracle interprets this character literally in the pattern, rather than as a special pattern matching character. See for more information about pattern matching.

这样实现我们的需求:

EXECUTE DBMS_LOGSTDBY.SKIP (stmt => 'DML', schema_name => 'MYSCHEMA', objectname => 'XXX/%', proc_name => null,ESC=>'/');

本来是非常简单的一个方法,却因为我们没有好好仔细看一遍Manual,所以一段时间内不知道如何实现。

遇到问题,看官方手册应该是第一位的,而不是百度和google。

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