This is a time-honored topic, and there’s no shortage of articles on the topic on this blog. I wanted to write a post trying to condense and clarify those posts, as it has taken me a while to really understand this relationship. Some basic facts Most of us know that writing into Innodb updates buffer [...]
So lets say you upgraded from MySQL 5.1 to Percona Server 5.5 and instead of expected performance improvement you see your performance being worse. What should you do ? First if you followed MySQL upgrade best practices such as testing your workload with pt-upgrade the chances of this happening are rather slim. But lets assume [...]
There and in coming posts I am going to cover main features of Percona XtraDB Cluster. The first feature is High Availability. But before jumping to HA, let’s review general architecture of the Percona XtraDB Cluster.
Percona is glad to announce the release of Percona Server 5.5.19-24.0 on January 13th, 2012 (Downloads are available here and from the Percona Software Repositories). Based on MySQL 5.5.19, including all the bug fixes in it, Percona Server 5.5.19-24.0 is now the current stable release in the 5.5 series. All of Percona ‘s software is [...]
It is no secret that bugs related to multithreading–deadlocks, data races, starvations etc–have a big impact on application’s stability and are at the same time hard to find due to their nondeterministic nature. Any tool that makes finding such bugs easier, preferably before anybody is aware of their existence, is very welcome.
As Mark pointed out, there isn’t a lot of detail in the release notes about what could potentially be a very serious problem that is fixed in MySQL 5.1.60. I’ll repeat here the full documentation from the release notes: “InnoDB Storage Engine: Data from BLOB columns could be lost if the server crashed at a precise [...]
Percona is glad to announce the release of Percona XtraBackup 1.6.3 on 22 September, 2011 (Downloads are available here and from the Percona Software Repositories). This release is purely composed of bug fixes and is the current stable release of Percona Xtrabackup. If the innodb_file_per_table server option is being used and DDL operations, TRUNCATE TABLE, DROP/CREATE the_same_table or ALTER statements on InnoDB tables are [...]
We raised topic of problems with flushing in InnoDB several times, some links: InnoDB Flushing theory and solutions MySQL 5.5.8 in search of stability This was not often recurring problem so far, however in my recent experiments, I observe it in very simple sysbench workload on hardware which can be considered as typical nowadays.
One common theme in the questions our MySQL Support customers ask is MySQL Replication Lag. The story is typically along the lines everything is same as before and for some unknown reason the slave is started to lag and not catching up any more. I always smile at “nothing has changed” claim as it usually [...]
Percona is glad to announce the release of Percona XtraBackup 1.6.2 on 25 July, 2011 (Downloads are available here and from thePercona Software Repositories). This release is purely composed of bug fixes and is the current stable release of Percona Xtrabackup. All of Percona’s software is open-source and free, all the details of the release and [...]