MySQL 8.4 Reference Manual Including MySQL NDB Cluster 8.4
The MySQL process list indicates the operations currently
being performed by the set of threads executing within the
server. The processlist and
x$processlist views summarize
process information. They provide more complete information
than the SHOW PROCESSLIST
statement and the INFORMATION_SCHEMA
PROCESSLIST table, and are also
nonblocking. By default, rows are sorted by descending process
time and descending wait time. For a comparison of process
information sources, see
Sources of Process Information.
The column descriptions here are brief. For additional
information, see the description of the Performance Schema
threads table at
Section 29.12.22.8, “The threads Table”.
The processlist and
x$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.
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.