MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6
These views summarize the InnoDB locks that
transactions are waiting for. By default, rows are sorted by
descending lock age.
The innodb_lock_waits and
x$innodb_lock_waits views have
these columns:
wait_started
The time at which the lock wait started.
wait_age
How long the lock has been waited for, as a
TIME value.
wait_age_secs
How long the lock has been waited for, in seconds.
locked_table
The name of the locked table. This column contains combined schema/table name values.
locked_index
The name of the locked index.
locked_type
The type of the waiting lock.
waiting_trx_id
The ID of the waiting transaction.
waiting_trx_started
The time at which the waiting transaction started.
waiting_trx_age
How long the waiting transaction has been waiting, as a
TIME value.
waiting_trx_rows_locked
The number of rows locked by the waiting transaction.
waiting_trx_rows_modified
The number of rows modified by the waiting transaction.
waiting_pid
The processlist ID of the waiting transaction.
waiting_query
The statement that is waiting for the lock.
waiting_lock_id
The ID of the waiting lock.
waiting_lock_mode
The mode of the waiting lock.
blocking_trx_id
The ID of the transaction that is blocking the waiting lock.
blocking_pid
The processlist ID of the blocking transaction.
blocking_query
The statement the blocking transaction is executing. This field reports NULL if the session that issued the blocking query becomes idle. For more information, see Identifying a Blocking Query After the Issuing Session Becomes Idle.
blocking_lock_id
The ID of the lock that is blocking the waiting lock.
blocking_lock_mode
The mode of the lock that is blocking the waiting lock.
blocking_trx_started
The time at which the blocking transaction started.
blocking_trx_age
How long the blocking transaction has been executing, as a
TIME value.
blocking_trx_rows_locked
The number of rows locked by the blocking transaction.
blocking_trx_rows_modified
The number of rows modified by the blocking transaction.
sql_kill_blocking_query
The KILL statement to
execute to kill the blocking statement.
sql_kill_blocking_connection
The KILL statement to
execute to kill the session running the blocking
statement.