30.4.3.22 The processlist and x$processlist Views

The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. The processlist and x$processlist views summarize process information. They provide more complete information than the SHOW PROCESSLIST statement and the INFORMATION_SCHEMA PROCESSLIST table, and are also nonblocking. By default, rows are sorted by descending process time and descending wait time. For a comparison of process information sources, see Sources of Process Information.

The column descriptions here are brief. For additional information, see the description of the Performance Schema threads table at Section 29.12.21.8, “The threads Table”.

The processlist and x$processlist views have these columns:

• thd_id

  The thread ID.

• conn_id

  The connection ID.

• user

  The thread user or thread name.

• db

  The default database for the thread, or NULL if there is none.

• command

  For foreground threads, the type of command the thread is executing on behalf of the client, or Sleep if the session is idle.

• state

  An action, event, or state that indicates what the thread is doing.

• time

  The time in seconds that the thread has been in its current state.

• current_statement

  The statement the thread is executing, or NULL if it is not executing any statement.

• execution_engine

  The query execution engine. The value is either PRIMARY or SECONDARY. For use with HeatWave Service and HeatWave, where the PRIMARY engine is InnoDB and SECONDARY engine is HeatWave (RAPID). For MySQL Community Edition Server, MySQL Enterprise Edition Server (on-premise), and HeatWave Service without HeatWave, the value is always PRIMARY. This column was added in MySQL 8.0.29.

• statement_latency

  How long the statement has been executing.

• progress

  The percentage of work completed for stages that support progress reporting. See Section 30.3, “sys Schema Progress Reporting”.

• lock_latency

  The time spent waiting for locks by the current statement.

• cpu_latency

  The time spent on CPU for the current thread.

• rows_examined

  The number of rows read from storage engines by the current statement.

• rows_sent

  The number of rows returned by the current statement.

• rows_affected

  The number of rows affected by the current statement.

• tmp_tables

  The number of internal in-memory temporary tables created by the current statement.

• tmp_disk_tables

  The number of internal on-disk temporary tables created by the current statement.

• full_scan

  The number of full table scans performed by the current statement.

• last_statement

  The last statement executed by the thread, if there is no currently executing statement or wait.

• last_statement_latency

  How long the last statement executed.

• current_memory

  The number of bytes allocated by the thread.

• last_wait

  The name of the most recent wait event for the thread.

• last_wait_latency

  The wait time of the most recent wait event for the thread.

• source

  The source file and line number containing the instrumented code that produced the event.

• trx_latency

  The wait time of the current transaction for the thread.

• trx_state

  The state for the current transaction for the thread.

• trx_autocommit

  Whether autocommit mode was enabled when the current transaction started.

• pid

  The client process ID.

• program_name

  The client program name.