我們要去 check 為啥過期了
----看一下 為啥 統計資訊過期了，簡化了，自己考慮複雜情況 ----
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;
這個指令碼 會檢查 統計資訊 收集的 時間間隔
explain plan for select * from test where owner='scott';
---檢查過期了沒----
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';
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