Quite often we need to perform a so-called "MySQL instance audit". This common DBA procedure should give you a general view of the MySQL environment. You may be interested in a basic understanding of what kind of operation MySQL performs, how much memory does it use, or how well does it look from the performance point of view. There is no easy out-of-the-box way to do such an audit on a MySQL server. You can use "SHOW STATUS" and check the list of system variables, but this way can hardly be called DBA-friendly. Fortunately there are several tools to make this process easier. Among most popular are mysqlreport and MySQLTuner. In this post I'd like to give a brief overview of MySQLTuner.So, what can MySQLTuner do? Quoting the documentation: "MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability. Within  []

Note: This article is about the "WHERE" extension to "SHOW". I specifically use "SHOW STATUS" as an example, but "WHERE" is an extension to many "SHOW" statements.Often DBAs will assess the health of a system by looking at some of the status variables returned by "SHOW GLOBAL STATUS" (specifying "GLOBAL" is important; remember that "SHOW STATUS" is the same as "SHOW SESSION STATUS"). There are many status variables that "SHOW GLOBAL STATUS" returns. ("SHOW GLOBAL STATUS" on a Windows machine, MySQL version 5.0.67 returned 249, 5.1.22 returned 256 and 6.0.6-alpha returned 295 status variables!). I have used the "SHOW STATUS LIKE" syntax to help give me the output I really want, particularly when I forget the exact names of the status variables I am looking for.But I did not know of a way to perform "SHOW  []