A sleep query is the query that waits for the timeout to terminate
Effects of a large number of MYSQL query – sleep :
1. Increased consumption of CPU and memory resources
2. Slowing down of server.
3. Increased downtime for websites
To overcome this issue of SQL sleep command, MySQL uses two parameters:
1. Interactive Timeout
2. Wait Timeout
MySQL database has a high volume of concurrent, long-running queries and while checking the status of connections, you might get some connections with the status- “sleep”.