27.4.3.9 The innodb_lock_waits and x$innodb_lock_waits Views

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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_schema
The schema that contains the locked table.
locked_table_name
The name of the locked table.
locked_table_partition
The name of the locked partition, if any; NULL otherwise.
locked_table_subpartition
The name of the locked subpartition, if any; NULL otherwise.
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.

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Document created the 26/06/2006, last modified the 26/10/2018
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References

Manuel MySQL : https://dev.mysql.com/

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