mysql order by rand performance

The RAND () Optimization Method for MySQL optimization and the rand Method for mysql Optimization As we all know, in MySQL, if order by rand () is used directly, the efficiency is very poor because it will be executed multiple times. In fact, this

"How does the Order by rand () in MySQL come into being?" Let's briefly talk about order by in MySQL today.case of several order byShangri-La CasinoAt first glance the problem seems a bit complicated, and we start with the simplest case.Use this

Next I will use the users (Userid,username,password ...). Table (with Ibedovan Records) as an example, to explain the next several methods of efficiency problems: The code is as follows Copy Code 1.select * from the

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's

MySQL optimization under 8G memory Try the following settings:Key_buffer = 3840MMax_allowed_packet = 16MTable_cache = 1024Sort_buffer_size = 32MRead_buffer_size = 32MRead_rnd_buffer_size = 32MMyisam_sort_buffer_size = 256MThread_cache_size =

The mysql tutorial does not use the rand () function to randomly read database tutorial records.As well as google's related files, we found that order by rand () is almost the same, but there are actually very serious performance problems.If your

Address of this articleShare an outline:1. Optimize your query for query caching 2. EXPLAIN your SELECT query 3. Use LIMIT 1 4 when only one row of data is used. Jianjian index 5 for search word. In the join table, use a fairly type of example and

Mysql database performance optimization 1. mysql Performance Optimization Today, database operations are increasingly becoming the performance bottleneck of the entire application, especially for Web applications. Concerning the database performance,

Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the performance of the database that DBAs need to worry about, it's

http://blog.chinaunix.net/space.php?uid=374372&do=blog&id=3085009Today, database operations are increasingly becoming a performance bottleneck for the entire application, which is especially noticeable for web applications. It's not just about the