The Ultimate Guide to High Availability with MariaDB

Information Schema INNODB_MUTEXES Table

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MariaDB starting with 10.1.3

The Information Schema INNODB_MUTEXES table was added in MariaDB 10.1.3

The INNODB_MUTEXES table monitors mutex and rw locks waits. It has the following columns:

ColumnDescription
NAMEFile name and line number of the mutex implementation. Remember that this information depends on your InnoDB/XtraDB version.
CREATE_FILE
CREATE_LINE
OS_WAITS

Examples

SELECT * FROM INNODB_MUTEXES;
+------------------------------+---------------------+-------------+----------+
| NAME                         | CREATE_FILE         | CREATE_LINE | OS_WAITS |
+------------------------------+---------------------+-------------+----------+
| &dict_sys->mutex             | dict0dict.cc        |         989 |        2 |
| &buf_pool->flush_state_mutex | buf0buf.cc          |        1388 |        1 |
| &log_sys->checkpoint_lock    | log0log.cc          |        1014 |        2 |
| &block->lock                 | combined buf0buf.cc |        1120 |        1 |
+------------------------------+---------------------+-------------+----------+

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