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标签归档:_drop_stat_segment
sysaux中HEATMAP 对象较大
在一次数据检查中,发现HEATMAP对象比较大
SQL> select * from v$version; BANNER CON_ID -------------------------------------------------------------------------------- ---------- Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production 0 PL/SQL Release 12.1.0.2.0 - Production 0 CORE 12.1.0.2.0 Production 0 TNS for Linux: Version 12.1.0.2.0 - Production 0 NLSRTL Version 12.1.0.2.0 - Production 0 SQL> col owner for a30 SQL> col segment_name for a30 SQL> col segment_type for a20 set lines 150 SELECT owner, segment_name, segment_type, sum(bytes/1024/1024/1024) FROM dba_extents WHERE tablespace_name='SYSAUX' and segment_name='HEATMAP' group by owner, segment_name, segment_type;SQL> SQL> 2 3 4 5 OWNER SEGMENT_NAME SEGMENT_TYPE SUM(BYTES/1024/1024/1024) ------------------------------ ------------------------------ -------------------- ------------------------- SYS HEATMAP SYSTEM STATISTICS 1.58789063
检查Heat Map特性为关闭
SQL> show parameter HEAT_MAP; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ heat_map string OFF
查询mos发现相关Bug 20678613 – HEATMAP SIZE IS 500 MB, THOUGH HEAT_MAP IS TURNED OFF.通过设置_drop_stat_segment为1来自动减小HEATMAP(其默认值为0)
---默认值 SQL> col name for a52 SQL> col value for a24 SQL> col description for a50 set linesize 150 select a.ksppinm name,b.ksppstvl value,a.ksppdesc description from x$ksppi a,x$ksppcv b where a.inst_id = USERENV ('Instance') and b.inst_id = USERENV ('Instance') and a.indx = b.indx and upper(a.ksppinm) LIKE upper('%¶m%') SQL> SQL> 2 3 4 5 6 7 order by name / 8 Enter value for param: _drop_stat_segment old 6: and upper(a.ksppinm) LIKE upper('%¶m%') new 6: and upper(a.ksppinm) LIKE upper('%_drop_stat_segment%') NAME VALUE DESCRIPTION ---------------------------------------------------- ------------------------ ---------------------------- _drop_stat_segment 0 drop ilm statistics segment ---设置值 ALTER SYSTEM SET "_drop_stat_segment" =1;
如果需要也可以人工进行删除
exec dbms_space_admin.heat_map_segment_drop;
参见:HEATMAP Segment Size Is Large In SYSAUX Even When Heatmap=Off (Doc ID 2024036.1)
Bug 24704547 : SYS.HEATMAP GROWS IN SIZE IN 12C UNDER SYSAUX TBS