69 lines
2.3 KiB
Plaintext
69 lines
2.3 KiB
Plaintext
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Optimizer Statistics Gathering – pending and history
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https://www.dbi-services.com/blog/optimizer-statistics-gathering-pending-and-history/
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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create user XIZOR identified by secret;
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grant connect, resource to XIZOR;
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grant unlimited tablespace to XIZOR;
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grant select any dictionary to XIZOR;
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connect XIZOR/secret
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create table DEMO as select rownum n from dual;
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col analyzed for a30
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col published_prefs for a30
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select num_rows,cast(last_analyzed as timestamp) analyzed,dbms_stats.get_prefs('PUBLISH',owner,table_name) published_prefs from dba_tab_statistics where owner='XIZOR' and table_name in ('DEMO');
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insert into DEMO select rownum n from xmltable('1 to 41');
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set pages 999 lines 200
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select /*+ gather_plan_statistics */ count(*) from DEMO;
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select * from table(dbms_xplan.display_cursor(format=>'basic +rows +rowstats last'));
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exec dbms_stats.set_table_prefs('XIZOR','DEMO','PUBLISH','FALSE');
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exec dbms_stats.gather_table_stats('XIZOR','DEMO');
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select num_rows,cast(last_analyzed as timestamp) analyzed,dbms_stats.get_prefs('PUBLISH',owner,table_name) published_prefs from dba_tab_pending_stats where owner='XIZOR' and table_name in ('DEMO');
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exec dbms_stats.delete_pending_stats('XIZOR','DEMO');
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exec dbms_stats.publish_pending_stats('XIZOR','DEMO',no_invalidate=>false);
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exec dbms_stats.set_table_prefs('XIZOR','DEMO','PUBLISH','TRUE');
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exec dbms_stats.restore_table_stats('XIZOR','DEMO',sysdate-1,no_invalidate=>false);
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select report from table(dbms_stats.diff_table_stats_in_history('XIZOR','DEMO',sysdate-1,sysdate,0));
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select
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end_time,end_time-start_time,operation,target,
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regexp_replace(regexp_replace(notes,'" val="','=>'),'(||)',' '),
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status
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from
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DBA_OPTSTAT_OPERATIONS where regexp_like(target,'"?'||'XIZOR'||'"?."?'||'DEMO'||'"?') order by end_time desc fetch first 10 rows only
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/
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select table_name,stats_update_time from dba_tab_stats_history where owner='XIZOR' and table_name='DEMO';
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set long 2000000
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set pagesize 1000
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select * from table(dbms_stats.diff_table_stats_in_history(
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ownname => 'XIZOR',
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tabname => 'DEMO',
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time1 => systimestamp-1,
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time2 => systimestamp,
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pctthreshold => 0));
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