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Tag Archives: INDEX FULL SCAN
11g改变了DELETE语句的执行计划
在11.2中,如果DELETE的时候没有限制条件,且表上存在主键的话,执行计划会变为索引全扫。 在和600聊天的时候听说了这个现象,开始的时候还不是很相信。当时600特意验证了一下,事实确实如此。 于是特意自己也做了个简单的例子: SQL> SELECT * FROM v$version; BANNER ——————————————————————————– Oracle DATABASE 11g Enterprise Edition Release 11.2.0.2.0 – Production PL/SQL Release 11.2.0.2.0 – Production CORE 11.2.0.2.0 Production TNS FOR Linux: Version 11.2.0.2.0 – Production NLSRTL Version 11.2.0.2.0 – Production SQL> … Continue reading