Percona-XtraDB-9.1: released and new coming features

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Recently Alexandr announced new Percona-XtraDB-9.1 release, and now it is good time to summarize features we have and what is expected soon.

This release contains long waited features from 5.0:

  • extended slow.log

Extended slow.log is now even more extended, there is additional information for each query:

That is you can see how many bytes was returned by query, was temporary table used,
was it disk table or in-memory, and how big was temporary table.

Also you can profile each individual query from stored procedures, so now you should not
guess what took so long in stored procedure.

What we are working on right now is:

  • InnoDB pagesize, so you will be able to specify 4K, 8K, 16K pagesize when you created database
  • InnoDB fast checksums, idea and implementation was taken from Facebook patches
  • InnoDB big log files ( bigger 4GB). As our benchmarks on FusionIO shows, you may need
    4GB+ log files to get more performance on fast storage systems
  • SHOW TEMPORARY TABLES, patch from Venu Anuganti
  • INFORMATION_SCHEMA.SYS_TABLES and SYS_INDEXES to show internal InnoDB data dictionary

Full list of XtraDB engine features (what makes it different from InnoDB-plugin) on the state as it is right now:

Performance improvements

  • Improved buffer_pool scalability
  • Fast recovery
  • Improved IO path
  • Improved rollback segment scalability
  • Separate purge thread
  • Limited size of data dictionary in memory
  • Increased number of concurrent write transactions (undo slots) ( up to 4000 )
  • Fast checksums ( in release process )
  • Support of different pagesizes ( 4K, 8K, 16K) ( in release process )

Usability / operations

  • Show content of buffer_pool
  • Import / export of dedicated tables
  • Import / export of buffer_pool
  • Transactional replication
  • Show internal InnoDB data dictionary
  • Show InnoDB locking/io profiling in slow.log

I hope you enjoy our work!

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Vadim Tkachenko

Vadim leads Percona's development group, which produces Percona Clould Tools, the Percona Server, Percona XraDB Cluster and Percona XtraBackup. He is an expert in solid-state storage, and has helped many hardware and software providers succeed in the MySQL market.



MySQL, Percona Software


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