The Ultimate Guide to High Availability with MariaDB

Performance Schema table_lock_waits_summary_by_table Table

You are viewing an old version of this article. View the current version here.

The table_lock_waits_summary_by_table table records table lock waits by table.

ColumnDescription
OBJECT_TYPESince this table records waits by table, always set to TABLE.
OBJECT_SCHEMASchema name.
OBJECT_NAMETable name.
COUNT_STARNumber of summarized events and the sum of the x_READ and x_WRITE columns.
SUM_TIMER_WAITTotal wait time of the summarized events that are timed.
MIN_TIMER_WAITMinimum wait time of the summarized events that are timed.
AVG_TIMER_WAITAverage wait time of the summarized events that are timed.
MAX_TIMER_WAITMaximum wait time of the summarized events that are timed.
COUNT_READNumber of all read operations, and the sum of the equivalent x_READ_NORMAL, x_READ_WITH_SHARED_LOCKS, x_READ_HIGH_PRIORITY and x_READ_NO_INSERT columns.
SUM_TIMER_READTotal wait time of all read operations that are timed.
MIN_TIMER_READMinimum wait time of all read operations that are timed.
AVG_TIMER_READAverage wait time of all read operations that are timed.
MAX_TIMER_READMaximum wait time of all read operations that are timed.
COUNT_WRITENumber of all write operations, and the sum of the equivalent x_WRITE_ALLOW_WRITE, x_WRITE_CONCURRENT_INSERT, x_WRITE_DELAYED, x_WRITE_LOW_PRIORITY and x_WRITE_NORMAL columns.
SUM_TIMER_WRITETotal wait time of all write operations that are timed.
MIN_TIMER_WRITEMinimum wait time of all write operations that are timed.
AVG_TIMER_WRITEAverage wait time of all write operations that are timed.
MAX_TIMER_WRITEMaximum wait time of all write operations that are timed.
COUNT_READ_NORMALNumber of all internal read normal locks.
SUM_TIMER_READ_NORMALTotal wait time of all internal read normal locks that are timed.
MIN_TIMER_READ_NORMALMinimum wait time of all internal read normal locks that are timed.
AVG_TIMER_READ_NORMALAverage wait time of all internal read normal locks that are timed.
MAX_TIMER_READ_NORMALMaximum wait time of all internal read normal locks that are timed.
COUNT_READ_WITH_SHARED_LOCKSNumber of all internal read with shared locks.
SUM_TIMER_READ_WITH_SHARED_LOCKSTotal wait time of all internal read with shared locks that are timed.
MIN_TIMER_READ_WITH_SHARED_LOCKSMinimum wait time of all internal read with shared locks that are timed.
AVG_TIMER_READ_WITH_SHARED_LOCKSAverage wait time of all internal read with shared locks that are timed.
MAX_TIMER_READ_WITH_SHARED_LOCKSMaximum wait time of all internal read with shared locks that are timed.
COUNT_READ_HIGH_PRIORITYNumber of all internal read high priority locks.
SUM_TIMER_READ_HIGH_PRIORITYTotal wait time of all internal read high priority locks that are timed.
MIN_TIMER_READ_HIGH_PRIORITYMinimum wait time of all internal read high priority locks that are timed.
AVG_TIMER_READ_HIGH_PRIORITYAverage wait time of all internal read high priority locks that are timed.
MAX_TIMER_READ_HIGH_PRIORITYMaximum wait time of all internal read high priority locks that are timed.
COUNT_READ_NO_INSERTNumber of all internal read no insert locks.
SUM_TIMER_READ_NO_INSERTTotal wait time of all internal read no insert locks that are timed.
MIN_TIMER_READ_NO_INSERTMinimum wait time of all internal read no insert locks that are timed.
AVG_TIMER_READ_NO_INSERTAverage wait time of all internal read no insert locks that are timed.
MAX_TIMER_READ_NO_INSERTMaximum wait time of all internal read no insert locks that are timed.
COUNT_READ_EXTERNALNumber of all external read locks.
SUM_TIMER_READ_EXTERNALTotal wait time of all external read locks that are timed.
MIN_TIMER_READ_EXTERNALMinimum wait time of all external read locks that are timed.
AVG_TIMER_READ_EXTERNALAverage wait time of all external read locks that are timed.
MAX_TIMER_READ_EXTERNALMaximum wait time of all external read locks that are timed.
COUNT_WRITE_ALLOW_WRITENumber of all internal read normal locks.
SUM_TIMER_WRITE_ALLOW_WRITETotal wait time of all internal write allow write locks that are timed.
MIN_TIMER_WRITE_ALLOW_WRITEMinimum wait time of all internal write allow write locks that are timed.
AVG_TIMER_WRITE_ALLOW_WRITEAverage wait time of all internal write allow write locks that are timed.
MAX_TIMER_WRITE_ALLOW_WRITEMaximum wait time of all internal write allow write locks that are timed.
COUNT_WRITE_CONCURRENT_INSERTNumber of all internal concurrent insert write locks.
SUM_TIMER_WRITE_CONCURRENT_INSERTTotal wait time of all internal concurrent insert write locks that are timed.
MIN_TIMER_WRITE_CONCURRENT_INSERTMinimum wait time of all internal concurrent insert write locks that are timed.
AVG_TIMER_WRITE_CONCURRENT_INSERTAverage wait time of all internal concurrent insert write locks that are timed.
MAX_TIMER_WRITE_CONCURRENT_INSERTMaximum wait time of all internal concurrent insert write locks that are timed.
COUNT_WRITE_DELAYEDNumber of all internal write delayed locks.
SUM_TIMER_WRITE_DELAYEDTotal wait time of all internal write delayed locks that are timed.
MIN_TIMER_WRITE_DELAYEDMinimum wait time of all internal write delayed locks that are timed.
AVG_TIMER_WRITE_DELAYEDAverage wait time of all internal write delayed locks that are timed.
MAX_TIMER_WRITE_DELAYEDMaximum wait time of all internal write delayed locks that are timed.
COUNT_WRITE_LOW_PRIORITYNumber of all internal write low priority locks.
SUM_TIMER_WRITE_LOW_PRIORITYTotal wait time of all internal write low priority locks that are timed.
MIN_TIMER_WRITE_LOW_PRIORITYMinimum wait time of all internal write low priority locks that are timed.
AVG_TIMER_WRITE_LOW_PRIORITYAverage wait time of all internal write low priority locks that are timed.
MAX_TIMER_WRITE_LOW_PRIORITYMaximum wait time of all internal write low priority locks that are timed.
COUNT_WRITE_NORMALNumber of all internal write normal locks.
SUM_TIMER_WRITE_NORMALTotal wait time of all internal write normal locks that are timed.
MIN_TIMER_WRITE_NORMALMinimum wait time of all internal write normal locks that are timed.
AVG_TIMER_WRITE_NORMALAverage wait time of all internal write normal locks that are timed.
MAX_TIMER_WRITE_NORMALMaximum wait time of all internal write normal locks that are timed.
COUNT_WRITE_EXTERNALNumber of all external write locks.
SUM_TIMER_WRITE_EXTERNALTotal wait time of all external write locks that are timed.
MIN_TIMER_WRITE_EXTERNALMinimum wait time of all external write locks that are timed.
AVG_TIMER_WRITE_EXTERNALAverage wait time of all external write locks that are timed.
MAX_TIMER_WRITE_EXTERNALMaximum wait time of all external write locks that are timed.

You can TRUNCATE the table, which will reset all counters to zero.

Comments

Comments loading...
Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.