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php大数据量有关问题，请问

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Jun 13, 2016 pm 12:21 PM

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php大数据量问题，请教
在网站上用户要下载历史记录，有几百万条记录，一旦用户选择全部条件搜索后下载，数据库和服务器就好像挂掉了，请问有哪些方法可以解决这类问题？
------解决思路----------------------
php打包，分割成几个文件，最后zip下载。
点击下载后，异步处理，后台启动一个php进程处理，避免服务器受到影响。
------解决思路----------------------
数据库做个主从，这种查询就直接走从数据库好了，如果实时性不强的话，也可以考虑在空闲时段打包好（可以增量打包如果用户可接受的话）提供给用户下载，
最重要的一点优化你下载的程序。
------解决思路----------------------
这取决于你打算将什么样格式的数据给用户
如果是在查询后逐条组装，显然是很慢的

如果格式比较简单，可用 INTO OUTFILE 子句直接将查询结果保存于文件。再将该文件的连接发给用户
INTO OUTFILE 子句默认产生的文件是以 Tab 做字段分隔符（很普通的 csv 格式），当然你还可以指定

INTO OUTFILE 产生的文件，可以用 LOAD DATA INFILE 指令导回表中。
不失为一种数据备份的方法

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