About me:Oracle ACE pro,optimistic,passionate and harmonious. Focus on ORACLE,MySQL and other database programming,peformance tuning,db design, j2ee,Linux/AIX,Architecture tech,etc
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发布时间:2014-09-23 23:09:12
TABLE函数在SQL中使用,可以将传入的集合转为普通表使用,与管道函数结合使用,往往能够提高效率,然后在实际应用过程中,发现CBO对TABLE函数的启发式基数估算,往往会导致性能问题。以下SQL虽然单条运行很快,但是运行非常频繁,严重消耗CPU资源。......【阅读全文】
吻的感觉适2025-07-18 23:11
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