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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.