关于web系统优化的具体操作方面有哪些？
我所认为的
1，数据库查询尽量次数少，能一次查询完成的，哪怕sql语句复杂，也不要分开几次查询
2.php函数实现，能用自带函数完成的功能的尽量用自带函数完成。
好像想不到其他的了，
欢迎补充
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别整这些没用的了。 加一台服务器， 加大内存。
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第一条其实也要看具体情况的。 如果你的sql语句很复杂。嵌套很多子查询。有时候分几次查询可能更优。
关于web优化方面就太多了。服务器端+前端+数据库 三者中随便一个就能说三天三夜了。
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这个……，我只在面试前了解过，因为每家公司基本都要问，要不基本就是面试题上都有，至于实际工作中，只是搞搞研发，也没和那多接触过，继续学习……
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感觉主要是数据库方面了，也不太认同楼主说的第一条。
楼上几位说的都有理，服务器加强点，可利用内存换时间。
------解决方案--------------------
优化第一条:请一个优秀的构架师
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1，数据库查询尽量次数少，能一次查询完成的，哪怕sql语句复杂，也不要分开几次查询
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过于片面
首先数据库要设计合理，其次在实际开发中要经常用Explain查看sql语句，继续调优
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对于第一条 ，如果在高并发状态下，复杂的sql还不如分开简单查询。当然还要看具体的sql以及锁的情况
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