Presented at MySQL Camp 2009 by Ewen Fortune of Percona. XtraDB is a storage engine for MySQL based on the InnoDB storage engine, designed to better scale on modern hardware, and including a variety of other features useful in high performance environments. It is fully backwards compatible, and so can be used as a drop-in replacement for standard InnoDB. XtraDB includes all of InnoDBs robust, reliable ACID-compliant design and advanced MVCC architecture, and builds on that solid foundation with more features, more tunability, more metrics, and more scalability. In particular, it is designed to scale better on many cores, to use memory more efficiently, and to be more convenient and useful. The new features are especially designed to alleviate some of InnoDBs limitations. We will talk about current status of XtraDB and directions of development.

InnoDB Database Recovery Techniques Peter Zaitsev (Percona) Presented at the 2009 MySQL Camp by Peter Zaitsev of Percona. Description: Have you ever had Innodb database corrupted or have deleted data accidentally and want it back ? This session will go through various approaches you can use to get most of your data back using MySQL build in features as well as third party open source tool. This session speaks about Innodb database recovery techniques (apart from recovering from back). First we will discuss various types of Innodb corruption and data loss scenarios ranging from user error to hardware failures. Then we will look at Innodb storage data structure to see what foundations does it has for corruption discovery and recovery. Then we will go into approaches one can use to recover data including: * Recovering Innodb dictionary running our of sync with .idb files * Recovering minor  []

Recently while we were building a slave with a newer version of MySQL 5.1 from an InnoDB Hot backup, the following error occurred when we ran "mysql_upgrade":mysql.time_zone OKmysql.time_zone_leap_second OKmysql.time_zone_name OKmysql.time_zone_transition OKmysql.time_zone_transition_type OKmysql.user OKRunning 'mysql_fix_privilege_tables'...ERROR 13 (HY000) at line 311: Can't get stat of './mysql/general_log.CSV' (Errcode: 2)ERROR 13 (HY000) at line 316: Can't get stat of './mysql/slow_log.CSV' (Errcode: 2)FATAL ERROR: Upgrade failedThe problem is that in MySQL 5.1, it is possible to log the slow query log and general log to tables in the "mysql" schema (source: Selecting General Query and Slow Query Log Output Destinations). These tables are  []