ORACLE cannot fetch plan for SQL_ID，fetchsql_id

ORACLE cannot fetch plan for SQL_ID，fetchsql_id

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：

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Dylan    Presents.