Buy Percona ServicesBuy Now!

Options that make XtraDB tablespaces not compatible with MySQL

Expanded undo slots

Enabling innodb_extra_undoslots breaks compatibility with other programs. Specifically, it makes the datafiles unusable for ibbackup or for a MySQL server that is not run with this option.

Fast checksums

Enabling innodb_fast_checksum will use more CPU-efficient algorithm, based on 4-byte words which can be beneficial for some workloads. Once enabled, turning it off will require table to be dump/imported again, since it will fail to start on data files created when innodb_fast_checksums was enabled.

Page sizes other than 16KiB

This is controlled by variable innodb_page_size. Changing the page size for an existing database is not supported. Table will need to be dumped/imported again if compatibility with MySQL is required.

Relocation of the doublewrite buffer

Variable innodb_doublewrite_file provides an option to put the buffer on a dedicated disk in order to parallelize I/O activity on the buffer and on the tablespace. Only in case of crash recovery this variable cannot be changed, in all other cases it can be turned on/off without breaking compatibility.

Visit Percona Store

General Inquiries

For general inquiries about our open source software and database management tools, please send us your question and someone will contact you.