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I have just found out about MySql 5.4

  • How stable is this version?

  • Where can I find more information on this version?

+1  A: 

MySQL 5.4 is a preview/test release, first one under Oracle. As a test release is not intend to be used on a production stations.

They say that the most important change in 5.4 was to introduce MySQL Optimizer which makes some of the queries run 90% faster.

Oracle wants to release MySQL more often and be more open for community ideas and use more community code.

Raf
Oracle did not have anything to do this with the 5.4 release.
Harrison Fisk
I meant the fact that it was released after Oracle bought Sun Microsystems which bought MySQL AB earlier.
Raf
+1  A: 

5.4 is officially a preview release, so not officially recommended for production yet. However, I do know of quite a few larger websites that are using it in production thanks to the terrific gains in performance.

As far as more information:

http://dev.mysql.com/doc/mysql-5.4-features/en/index.html

http://dev.mysql.com/doc/refman/5.4/en/news-5-4-0.html

http://dev.mysql.com/tech-resources/articles/mysql-54.html

Harrison Fisk