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Update sql_slow_by_or.md
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renfufei committed Oct 18, 2014
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Expand Up @@ -112,3 +112,5 @@ Oracle中 SQL 执行太慢的元凶: OR
而且, 存在进一步优化的空间,但是呢,已经满足业务需求,而且时间宝贵,项目多得做不完,没法子,留待以后研究吧

关于如何查看分析PL/SQL Devloper工具中的执行计划,请参考[利用pl/sql执行计划评估SQL语句的性能简析](http://www.2cto.com/database/201204/127178.html)

关于如何配置PL/SQL开发工具, 可以参考: [ORACLE数据库查看执行计划的方法](http://www.jb51.net/article/30465.htm)

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