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Is it normal to have sleep process in MySQL?
Or if your web application uses persistent connections and connection pooling, then it’s perfectly normal to have even lots of sleeping processes: in that case your application just opens up for example 100 SQL connections and keeps them open. That reduces connection opening/closing overhead.
How to reduce the wait time in MySQL?
Reduce the time your queries take – optimizing the longest ones. Setting MySQL wait_timeout to a suitable value. Using below command in MySQL, you can get the current value set for wait_timeout. (Its 28800 second by default) NOTE: The interactive timeout does not affect any web application connections.
When to close non interactive connection in MySQL?
If you have many sleep connection, you have to decrease the value of the “wait_timeout” variable to close non-interactive connection after waiting some times. the value is in second, it means that non-interactive connection still up to 8 hours. After 10 minutes if the sleep connection still sleeping the mysql or MariaDB drop that connection.
How long do database connections take in MySQL?
mysqld will timeout database connections based on two server options: Both are 28,800 seconds (8 hours) by default. If your connections are persistent (opened via mysql_pconnect) you could lower these numbers to something reasonable like 600 (10 minutes) or even 60 (1 minute).
What’s the worst case for MySQL sleep overflow?
The really worst case: It’s using one connection of your pool; If you would connect multiple times via console client and just close the client without closing the connection, you could use up all your connections and have to wait for the timeout to be able to connect again… but this is highly unlikely 🙂
How many idle connections are there in MySQL proccesslist?
Every time I execute a “SHOW PROCESSLIST” command it shows me about 400 idle (Status: Sleep) connections to the database Server emerging from our 5 Webservers.
How many PHP queries per second in MySQL?
After 10 minutes if the sleep connection still sleeping the mysql or MariaDB drop that connection. So I was running 300 PHP processes simulatenously and was getting a rate of between 60 – 90 per second (my process involves 3x queries). I upped it to 400 and this fell to about 40-50 per second.