合 Oracle优化器统计信息顾问任务AUTO_STATS_ADVISOR_TASK
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简介
生成建议
1 2 3 4 5 6 7 8 9 10 | SET LINESIZE 3000 SET LONG 500000 SET PAGESIZE 0 SET LONGCHUNKSIZE 100000 SELECT DBMS_STATS.REPORT_ADVISOR_TASK('AUTO_STATS_ADVISOR_TASK',NULL,'TEXT','ALL','ALL') AS REPORT FROM DUAL; SELECT * from DBA_ADVISOR_RECOMMENDATIONS d where d.task_name='AUTO_STATS_ADVISOR_TASK' ORDER by rec_id desc ; |
SM/ADVISOR 占用空间排名
查询视图 V$SYSAUX_OCCUPANTS 显示 SM/ADVISOR 占用空间排名靠前.
这个是由于12.2版本的一个新特性，即优化器统计信息顾问每天在维护窗口期间自动运行，因而引发了该问题。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | SQL> SET LINES 120 SQL> COL OCCUPANT_NAME FORMAT A30 SQL> SELECT OCCUPANT_NAME,SPACE_USAGE_KBYTES FROM V$SYSAUX_OCCUPANTS ORDER BY SPACE_USAGE_KBYTES DESC; OCCUPANT_NAME SPACE_USAGE_KBYTES ------------------------------ ------------------ SM/ADVISOR 5901376 SM/OPTSTAT 574080 ... SQL> COL SEGMENT_NAME FORMAT A30 SQL> COL OWNER FORMAT A10 SQL> COL TABLESPACE_NAME FORMAT A10 SQL> COL SEGMENT_TYPE FORMAT A15 SQL> SELECT * FROM (SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,BYTES/1024/1024 "SIZE(MB)",SEGMENT_TYPE FROM DBA_SEGMENTS WHERE TABLESPACE_NAME='SYSAUX' ORDER BY BYTES DESC) WHERE ROWNUM<=10; SEGMENT_NAME OWNER TABLESPACE SIZE(MB) SEGMENT_TYPE ------------------------------ ---------- ---------- ---------- --------------- WRI$_ADV_OBJECTS SYS SYSAUX 3600 TABLE WRI$_ADV_OBJECTS_IDX_01 SYS SYSAUX 1400 INDEX ... |
AUTO_STATS_ADVISOR_TASK 任务运行了很多次导致SYSAUX表空间增长迅速。
1 2 3 4 5 6 7 | SQL> COL TASK_NAME FORMAT A35 SQL> SELECT TASK_NAME, COUNT(*) CNT FROM DBA_ADVISOR_OBJECTS GROUP BY TASK_NAME ORDER BY CNT DESC; TASK_NAME CNT ----------------------------------- ---------- AUTO_STATS_ADVISOR_TASK 27082431 SYS_AUTO_SPM_EVOLVE_TASK 19 SYS_AUTO_SQL_TUNING_TASK 39 |
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