http://planetmysql.ru Блог о самой популярной СУБД MySQL Fri, 25 May 2012 06:11:10 +0000 en hourly 1 http://wordpress.org/?v=3.3 http://pbxt.blogspot.com/2009/09/pbxt-1009-rc3-implements-xa-and-online.html?utm_source=rss&utm_medium=rss&utm_campaign=pbxt-1-0-09-rc3-implements-xa-and-online-backup http://pbxt.blogspot.com/2009/09/pbxt-1009-rc3-implements-xa-and-online.html#comments Fri, 11 Sep 2009 15:16:00 +0000 Paul McCullagh release notes), this version includes 2 Beta features:

• XA/2-Phase Commit support
• Native online backup Driver

XA support has been around MySQL for quite a while, and we all know of it usefulness, for example when sharding. So I was surprised to find a bug in the XA recovery: Bug #47134. Contrary to what is reported, the crash can also occur when using XA with just the default engines installed, so watch out for that one (the good news: the bug fix is simple).

Online backup is really cool! I have heard that it may soon be released in a coming version of 5.4, so lets hope that this is true.

In a little test, I did a backup of a 10GB database in 49.26 seconds! Admitedly this was on a system with 4 15K drives in a RAID 0 configuration. But that is still a fantastic, considering the tables are not even locked during this time!

The database itself took 19 min. 56 sec. to generate. A complete restore took only 14 min. 29 sec.

But, it gets even better....

I have been working on PBXT 1.1, where I have done a number of things to improve the I/O performance of the engine.

In the same test as above, run with PBXT 1.1, the time to generate the database was 9 min. 35 sec., and the time to restore was 6 min 18 sec! (Time to generate the backup was identical.)

PBXT 1.1 is available directly from Launchpad here: lp:~pbxt-core/pbxt/staging, if you are interested in trying it out. 1.1 also has full support for memory based tables.

The new release candidate (PBXT 1.0.09) can be downloaded from primebase.org/download. It is also available from Lauchpad as the rc3 series: lp:pbxt/rc3.

Please report bugs here.

Any feedback is welcome! You can use Launchpad questions or the PBXT mailing list for this purpose.

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