Oracle常见面试题及答案详解2
2. 不借助第三方工具，怎样查看sql的执行计划I) 使用Explain Plan,查询PLAN_TABLE;
EXPLAINPLAN
SET STATEMENT_ID=’QUERY1’
FOR
SELECT *
FROM a
WHERE aa=1;
SELECT operation, options, object_name, object_type, ID, parent_id
FROM plan_table
WHERE STATEMENT_ID = ’QUERY1’
ORDER BY ID;
II)SQLPLUS中的SET TRACE 即可看到Execution Plan Statistics
SET AUTOTRACE ON;
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