mysql - MySQL: precompute data for better performance

Question

Is it ok to precompute data for better performance? For example, when player wins a game, I count number of won games for the particular player and write it to a dedicated table. Then, when I show overall ratings, I don't need to count number of won games for the players once again — I already have it precomputed.

Of course, it's possible, that precomputed data becomes unsyncronized with real values, but it's bearable.

Or is there another, more "professional" way to resolve the issue?

Answer 1

No, its perfectly fine and is mostly done for large datasets you'd else had to perform sum/count/group by statements that cost alot performance.

if "out of sync" is not a problem to realtime, use nightly-jobs to verify they are still in sync, or update them if they are not.

Answer 2

使用不同的方法 -

1. 将聚合值存储在单独的汇总表中
2. 根据原始表存储聚合值

没有正确或错误的答案。可能在你的情况下你想使用 1) 所以你有一个聚合表，比如​​：

PlayerID AggregateName AggregateValue

然后，您可以轻松扩展聚合，而无需修改表结构。