30.4.3.22 The processlist and x$processlist Views (original) (raw)

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 andx$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, seeSources of Process Information.

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

The processlist andx$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, orNULL if there is none.
• command
  For foreground threads, the type of command the thread is executing on behalf of the client, orSleep 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, orNULL if it is not executing any statement.
• execution_engine
  The query execution engine. The value is eitherPRIMARY orSECONDARY. For use with HeatWave Service and HeatWave, where the PRIMARY engine isInnoDB 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. SeeSection 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.