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Problem Solutions

  




 

 

27.1.1. MySQL Threads

The MySQL server creates the following threads:

  • The TCP/IP connection thread handles all connection requests and creates a new dedicated thread to handle the authentication and SQL query processing for each connection.

  • On Windows NT there is a named pipe handler thread that does the same work as the TCP/IP connection thread on named pipe connect requests.

  • The signal thread handles all signals. This thread also normally handles alarms and calls process_alarm() to force timeouts on connections that have been idle too long.

  • If mysqld is compiled with -DUSE_ALARM_THREAD, a dedicated thread that handles alarms is created. This is only used on some systems where there are problems with sigwait() or if you want to use the thr_alarm() code in your application without a dedicated signal handling thread.

  • If one uses the --flush_time=val option, a dedicated thread is created to flush all tables at the given interval.

  • Every connection has its own thread.

  • Each table for which INSERT DELAYED statements are issued gets its own thread.

  • If you use --master-host, a slave replication thread is started to read and apply updates from the master.

  • If the event scheduler is active, there is one thread for the scheduler, and a thread for any event currently running.

mysqladmin processlist only shows the connection, INSERT DELAYED, replication threads, and event threads.


 
 
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