从其他程序推送数据到php程序里， 然后对数据进行判断是否存在，存在则退出；不存在则插入数据库， 并返回处理结果到数据源
当流量大，出现卡库的情况， 返回不到结果到数据源。就会重复请求3次。最后的结果就是3次请求的数据都插入了
慢导致判断不到数据是否存在。大神们，有什么好的解决办法吗?
升级配置是一方面. 在程序上应该怎么解决这个问题呢
回复内容：
从其他程序推送数据到php程序里， 然后对数据进行判断是否存在，存在则退出；不存在则插入数据库， 并返回处理结果到数据源
当流量大，出现卡库的情况， 返回不到结果到数据源。就会重复请求3次。最后的结果就是3次请求的数据都插入了
慢导致判断不到数据是否存在。大神们，有什么好的解决办法吗?
升级配置是一方面. 在程序上应该怎么解决这个问题呢
我觉得你的重复这个和卡库并没有太大关系, 流量大的时候对数据库做高并发的插入处理, 这种方式本身就可能有问题, 在这种情况情况下, 是不是可以通过队列(使用redis就可以实现)来防止你的插入重复的问题会比较好一些呢.
至于卡库, 当然是和流量有关系了, 对此, 你可以把库进行主从配置, 主库用来写, 从库用来读, 这样读的压力就不会落在主库上面了, 也就不会太卡,同时, 对于读的操作, 必要添加一些缓存, memcached, redis都很不错
首先一个问题，你是如何判断这条数据是唯一的？如果必须先插入才知道，那我建议使用redis做一个锁，对你这个用户的操作加锁，然后去改数据库。
mysql没有upsert比较遗憾
当然自己实现一个upsert也可以 如果数据能hash的话 可以利用类似bloom filter的方法在内存里先过滤一道
不准的再去查数据库
单从mysql可以使用事务配合唯一索引来做到数据不重复
这个问题是和卡库没关系，实际上应该是程序上的写法出错了。数据库是有队列的，不需要你自己去处理。
查询-->返回-->插入
你的问题应该出现在数据库返回给PHP的时候，又被查询了一样的不存在数据，因为返回还是不存在，所以PHP还是执行了插入。可以考虑用存储过程直接在数据库判断存在性然后写入。唯一索引、组合唯一也可以考虑用上。
实际上此类的并发出现概率原则上是非常低的，你可以检查下是不是使用了多线程配置这个网站了。
多谢几位了.
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