查看统计信息_脚本

我们要去 check 为啥过期了

----看一下 为啥 统计信息过期了，简化了，自己考虑复杂情况 ----

select *

from all_tab_modifications

where table_owner in (select object_owner from plan_table)

and table_name in (select object_name from plan_table )

and (inserts > 0 or updates > 0 or deletes > 0)

order by 5 desc,6 desc ,7 desc;

select owner,

table_name,

partition_name,

subpartition_name,

stats_update_time,

stats_update_time - lag(stats_update_time, 1, null) over(partition by owner, table_name order by stats_update_time) interval

from DBA_TAB_STATS_HISTORY

where owner = 'SCOTT'

and table_name = 'TEST'

order by owner, table_name, stats_update_time desc;

这个脚本 会检查 统计信息 收集的 时间间隔

explain plan for select * from test where owner='SCOTT';

---检查过期了没----

exec dbms_stats.flush_database_monitoring_info;

with tab as

(select object_name

from plan_table

where object_type = 'TABLE'

union

select table_name

from dba_indexes

where owner in (select object_owner from plan_table)

and index_name in (select object_name from plan_table)),

owner as

(select object_owner

from plan_table

where object_type = 'TABLE'

union

select table_owner

from dba_indexes

where owner in (select object_owner from plan_table)

and index_name in (select object_name from plan_table))

select owner, table_name name, object_type, stale_stats, last_analyzed

from dba_tab_statistics

where table_name in (select object_name from tab)

and owner in (select object_owner from owner)

and (stale_stats = 'YES' or last_analyzed is null);

select owner, table_name name, object_type, stale_stats, last_analyzed

from dba_tab_statistics

where table_name='TEST';