今天做SQL执行计划测试的时候,发现sqlplus无法正常打印执行计划,根据网上资料整理如下:

.....

SYS@orcl> select *
2 from table(
3 dbms_xplan.display_cursor( format=> 'allstats last' )
4 )
5 /


PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------
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)

注意: 标红的SQL_ID确实不存在,原因是SQLPLUS打开了SERVEROUTPUT ,TOM的解释如下:

do you see the sql it is showing - dbms_output.get_lines....

the last sql your session executed was in fact that call - sqlplus does that when you have set serveroutput on


issue 解决方法:

set serveroutput off

and try it... 再次查询

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Dylan Presents.