在手工更新统计信息时，报ORA-20005异常
SQL>exec dbms_stats.gather_table_stats('SYS','TEST');
BEGINdbms_stats.gather_table_stats('SYS','TEST'); END;
*
ERRORat line 1:
ORA-20005:object statistics are locked (stattype = ALL)
ORA-06512:at "SYS.DBMS_STATS", line 24281
ORA-06512:at "SYS.DBMS_STATS", line 24332
ORA-06512:at line 1
异常原因：查询test表统计信息stattype_locked值，发现统计信息被锁定
SQL> select owner,table_name,stattype_locked from dba_tab_statistics a where a.stattype_locked in ('ALL','DATA','CACHE') and table_name='TEST';
OWNER TABLE_NAME STATTYPE_L
--------------- ------------------------------ ----------
SYS TEST ALL
处理方案：将统计信息解锁，然后在执行更新
SQL>exec dbms_stats.unlock_table_stats(ownname => 'SYS',tabname => 'TEST');
PL/SQLprocedure successfully completed.
SQL>exec dbms_stats.gather_table_stats('SYS','TEST');
PL/SQL procedure successfully completed.
注：stattype_locked为空代表统计信息未锁定，为all表示表的统计信息被锁
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