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Displaying posts with tag: show variables (reset)

Changes in Configuration of Global Variables between MySQL 5.6.20 and MySQL 5.7.4 “Milestone 14″
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While doing some testing (that I published later here) on the still-in-development MySQL 5.7 I wanted to do some analysis on the configuration to see if the changes in performance were due to the code changes or just to the new MySQL defaults (something that is very common in the migration from 5.5 to 5.6 due to the default transaction log size and other InnoDB parameters). …

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Understanding SHOW VARIABLES: DISABLED and NO values
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When you use SHOW VARIABLES LIKE “have_%” to see whether a particular feature is enabled, you will note the value of NO for some, and DISABLED for others. These values are not intrinsically clear for the casual onlooker, and often cause confusion. Typically, this happens with SSL and InnoDB. So, here is a quick clarification!

  • NO means that the feature was not enabled (or was actively disabled) in the build. This means the code and any required libraries are not present in the binary.
  • DISABLED means that the feature is built in and capable of …
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SHOW STATUS WHERE….
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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 …

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