Information Schema INNODB_UNDO_LOGS Table
INNODB_UNDO_LOGS are a Percona enhancement, introduced in version MariaDB 5.5.27 and removed in 10.0.
The Information Schema
INNODB_UNDO_LOGS table is a Percona enchancement, and is only available for XtraDB, not InnoDB (see XtraDB and InnoDB). It contains information about the the InnoDB undo log, with each record being an undo log segment. It was removed in MariaDB 10.0.
It has the following columns:
|Unique transaction ID number, matching the value from the information_schema.INNODB_TRX table.|
|Rollback segment ID, matching the value from the |
|Undo segment ID.|
|Indicates the operation type, for example |
|Segment state; one of |
|Size in pages of the segment.|