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Displaying posts with tag: mysql manual (reset)
Is 80% of RAM how you should tune your innodb_buffer_pool_size?

It seems these days if anyone knows anything about tuning InnoDB, it’s that you MUST tune your innodb_buffer_pool_size to 80% of your physical memory. This is such prolific tuning advice, it seems engrained in many a DBA’s mind.  The MySQL manual to this day refers to this rule, so who can blame the DBA?  The question is: does it makes sense?

What uses the memory on your server?

Before we question such advice, let’s consider what can take up RAM in a typical MySQL server in their broad categories.  This list isn’t necessarily complete, but I think it outlines the large areas a MySQL server could consume memory.

  • OS Usage: Kernel, running processes, filesystem cache, etc.
  • MySQL fixed usage: query cache, InnoDB …
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Tracking Server Variables, Documentation, Manuals, Changelogs for MySQL, InnoDB, MariaDB, and XtraDB

I find myself constantly looking up server variables (and manuals and changelogs) for MySQL, MariaDB, and XtraDB, which versions they are in, and so forth. So I finally created a couple pages which contain the links to all of these various bits of information across the various flavors of MySQL.

I’ve been using them every day, so I thought some others might want to bookmark these as well.

I’ve created the following:

o Changelogs
o Documentation
o Server Variables
o InnoDB Plugin Versions

The Changelogs page contains links for MySQL 3.23 up through 5.6, MariaDB 5.1 – 5.3, XtraDB 5.1 – 5.5, Xtrabackup 1.3 – …

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