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MySQL 8.3 Reference Manual
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10.14.2 Thread Command Values

A thread can have any of the following Command values:

  • Binlog Dump

    This is a thread on a replication source for sending binary log contents to a replica.

  • Change user

    The thread is executing a change user operation.

  • Close stmt

    The thread is closing a prepared statement.

  • Connect

    Used by replication receiver threads connected to the source, and by replication worker threads.

  • Connect Out

    A replica is connecting to its source.

  • Create DB

    The thread is executing a create database operation.

  • Daemon

    This thread is internal to the server, not a thread that services a client connection.

  • Debug

    The thread is generating debugging information.

  • Delayed insert

    The thread is a delayed insert handler.

  • Drop DB

    The thread is executing a drop database operation.

  • Error

  • Execute

    The thread is executing a prepared statement.

  • Fetch

    The thread is fetching the results from executing a prepared statement.

  • Field List

    The thread is retrieving information for table columns.

  • Init DB

    The thread is selecting a default database.

  • Kill

    The thread is killing another thread.

  • Long Data

    The thread is retrieving long data in the result of executing a prepared statement.

  • Ping

    The thread is handling a server ping request.

  • Prepare

    The thread is preparing a prepared statement.

  • Processlist

    The thread is producing information about server threads.

  • Query

    Employed for user clients while executing queries by single-threaded replication applier threads, as well as by the replication coordinator thread.

  • Quit

    The thread is terminating.

  • Refresh

    The thread is flushing table, logs, or caches, or resetting status variable or replication server information.

  • Register Slave

    The thread is registering a replica server.

  • Reset stmt

    The thread is resetting a prepared statement.

  • Set option

    The thread is setting or resetting a client statement execution option.

  • Shutdown

    The thread is shutting down the server.

  • Sleep

    The thread is waiting for the client to send a new statement to it.

  • Statistics

    The thread is producing server status information.

  • Time

    Unused.