14.17.1 InnoDB Monitor Types

There are four types of InnoDB monitors:

• The standard InnoDB Monitor displays the following types of information:

  • Work done by the main background thread

  • Semaphore waits

  • Data about the most recent foreign key and deadlock errors

  • Lock waits for transactions

  • Table and record locks held by active transactions

  • Pending I/O operations and related statistics

  • Insert buffer and adaptive hash index statistics

  • Redo log data

  • Buffer pool statistics

  • Row operation data

• The InnoDB Lock Monitor prints additional lock information as part of the standard InnoDB Monitor output.

• The InnoDB Tablespace Monitor prints a list of file segments in the shared tablespace and validates the tablespace allocation data structures.

• The InnoDB Table Monitor prints the contents of the InnoDB internal data dictionary.

  Note

  The Tablespace Monitor and Table Monitor are deprecated; expect them to be removed in a future MySQL release. Similar information for the Table Monitor can be obtained from InnoDB INFORMATION_SCHEMA tables. See Section 21.4, “INFORMATION_SCHEMA InnoDB Tables”.

For additional information about InnoDB table and tablespace monitors, see Mark Leith: InnoDB Table and Tablespace Monitors.