需求是这样的
用户每翻一页都可以看到随机且不重复浏览的数据
展示数据百万级，用户数10W左右
我起初是想用redis集合来实现
先用集合记录 全部可以展示数据的id
然后用集合记录 每个用户浏览过的数据id
用户每次翻页 SDIFFSTORE 上面两个集合 取差集得出 该用户没有浏览的数据id
然后SRANDMEMBER 随机出一个页的数据id
用数据id查出详细数据
发现性能不给力给放弃了
SRANDMEMBER 随机集合越大而越慢
SDIFFSTORE 得出差集还需要写入。。。
暂时没有思路了，还得求解大神们~~~
先谢了~~
回复内容：
需求是这样的
用户每翻一页都可以看到随机且不重复浏览的数据
展示数据百万级，用户数10W左右
我起初是想用redis集合来实现
先用集合记录 全部可以展示数据的id
然后用集合记录 每个用户浏览过的数据id
用户每次翻页 SDIFFSTORE 上面两个集合 取差集得出 该用户没有浏览的数据id
然后SRANDMEMBER 随机出一个页的数据id
用数据id查出详细数据
发现性能不给力给放弃了
SRANDMEMBER 随机集合越大而越慢
SDIFFSTORE 得出差集还需要写入。。。
暂时没有思路了，还得求解大神们~~~
先谢了~~
这个最好不要使用redis,你可以从Redis中将所有ID获取到，然后保存到Session中，每次通过集合随机获取并删除一批ID，然后将剩余的ID再保存到Session。没有了就再从Redis获取一次。
php 随机 id，存到session里，和redis没多大关系
其实你这部分id可以被cache在一次session中，真的没必要没一起都计算差值，因为你不但需要计算还需要Redis本身的开销．
在session中，两个array,一个保存全部，一个保存已经用过的，每一次分配的时候，从
array_diff中随机id.
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