oracle 锁定、对比统计信息




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 锁定schema统计

execute dbms_statS.unlock_schema_stats(ownname=>'SCOTT');

查看表锁定情况

SQL> select owner,table_name,STATTYPE_LOCKED from dba_tab_statistics where owner='SCOTT';

OWNER TABLE_NAME STATTYPE_L

------------------------------ ------------------------------ ----------

SCOTT BIN$ywjNKrPMSEygN6Kvb2yz7Q==$0

SCOTT BONUS ALL

SCOTT DEPT ALL

SCOTT EMP ALL

SCOTT SALGRADE ALL

SCOTT T ALL

解锁

SQL> execute dbms_statS.unlock_schema_stats(ownname=>'SCOTT');

SQL> select owner,table_name,STATTYPE_LOCKED from dba_tab_statistics where owner='SCOTT';

OWNER TABLE_NAME STATTYPE_L

------------------------------ ------------------------------ ----------

SCOTT BIN$ywjNKrPMSEygN6Kvb2yz7Q==$0

SCOTT BONUS

SCOTT DEPT

SCOTT EMP

SCOTT SALGRADE

SCOTT T

锁定表统计

execute dbms_stats.lock_table_stats(ownname=>'SCOTT',tabname=>'T');

收集统计信息将报错

execute dbms_stats.gather_table_stats(ownname=>'SCOTT',tabname=>'T');

SQL> execute dbms_stats.gather_table_stats(ownname=>'SCOTT',tabname=>'T');

BEGIN dbms_stats.gather_table_stats(ownname=>'SCOTT',tabname=>'T'); END;

*

第 1 行出现错误:

ORA-20005: object statistics are locked (stattype = ALL)

ORA-06512: 在 "SYS.DBMS_STATS", line 20337

ORA-06512: 在 "SYS.DBMS_STATS", line 20360

ORA-06512: 在 line 1

可以添加force强制覆盖

execute dbms_stats.gather_table_stats(ownname=>'SCOTT',tabname=>'T',force=>true);

SQL> create index iid_idx on t(iid) compute statistics;

create index iid_idx on t(iid) compute statistics

*

第 1 行出现错误:

ORA-38029: 对象统计信息已锁定

默认没有搜集统计信息，有点疑惑

SQL> create index iid_idx on t(iid) ;

execute dbms_statS.unlock_TABLE_stats(ownname=>'SCOTT',TABNAME=>'T');

比较对象统计信息。

SELECT *

FROM table(dbms_stats.diff_table_stats_in_pending(

ownname => 'SCOTT',

tabname => 'T',

time_stamp => NULL,

pctthreshold => 10));

SELECT *

FROM table(dbms_stats.diff_table_stats_in_pending(

ownname => 'SCOTT',

tabname => 'T',

time_stamp => NULL,

pctthreshold => 0));

SELECT *

FROM table(dbms_stats.diff_table_stats_in_stattab(

ownname => 'SCOTT',

tabname => 'T',

stattab1 => 'MYSTATS',

statid1 => 'SET1',

stattab1own => 'SCOTT',

pctthreshold => 0));

SELECT *

FROM table(dbms_stats.diff_table_stats_in_history(

ownname => 'SCOTT',

tabname => 'T',

time1 => systimestamp - to_dsinterval('0 00:00:15'),

time2 => NULL,

pctthreshold => 0));