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wabjtam123 发表于 2007-7-9 17:35 ![]()
三思同学,牛,学习了!
梁老师,我看过您的书,读过之后感觉收获很大,您书的第六章讲表的连接时,alter session set statistics_level=all;之后select * from table(dbms_xplan.display_cursor(null,null,'allstats last'));为什么没有统计信息呢,数据库版本10.2.0.1.0,SQL_ID 9babjv8yq8ru3, child number 0
BEGIN DBMS_OUTPUT.GET_LINES(:LINES, :NUMLINES); END;
NOTE: cannot fetch plan for SQL_ID: 9babjv8yq8ru3, CHILD_NUMBER: 0
Please verify value of SQL_ID and CHILD_NUMBER;
It could also be that the plan is no longer in cursor cache (check v$sql_plan)
所以想请教您一下? |
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