php记录用户操作日志的解决方案

b/s系统，客户要求系统要记录所有用户的操作（查看、修改、删除、添加等操作）功能
现在没有很好的方案来实现，不知哪位童鞋做过，给点思路

问题：
1.保存到数据库的话，数据量会非常大--肯定影响性能，不知有没有好的解决办法
2.保存到文件的话，是保存到一个文件中还是根据日期来保存到很多个文件中
如果保存到一个文件中也会有数据过大的问题
保存到很多文件的话如何实现根据不同用户检索操作日志以及分页显示问题

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