### 15.17.1 InnoDB Monitor Types

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 There are two types of `InnoDB` monitor:

* 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.

