MySQL 5.5 and MySQL 5.6 default variable values differences
As the part of analyzing surprising MySQL 5.5 vs MySQL 5.6 performance results I’ve been looking at changes to default variable values. To do that I’ve loaded the values from MySQL 5.5.30 and MySQL...
View ArticleClik here to view.
Virident vCache vs. FlashCache: Part 2
This is the second part in a two-part series comparing Virident’s vCache to FlashCache. The first part was focused on usability and feature comparison; in this post, we’ll look at some sysbench test...
View ArticleClik here to view.
MySQL and the SSB – Part 2 – MyISAM vs InnoDB low concurrency
This blog post is part two in what is now a continuing series on the Star Schema Benchmark.In my previous blog post I compared MySQL 5.5.30 to MySQL 5.6.10, both with default settings using only the...
View ArticleClik here to view.
InnoDB performance optimization basics (redux)
I recently stumbled upon a post that Peter Zaitsev published back in 2007 titled “Innodb Performance Optimization Basics.” It’s a great post and reading it inspired me to examine what’s changed in the...
View ArticleHow to reclaim space in InnoDB when innodb_file_per_table is ON
When innodb_file_per_table is OFF and all data is going to be stored in ibdata files. If you drop some tables of delete some data then there is no any other way to reclaim that unused disk space except...
View ArticleA closer look at the MySQL ibdata1 disk space issue and big tables
A recurring and very common customer issue seen here at the Percona Support team involves how to make the ibdata1 file “shrink” within MySQL. I can only imagine there’s a degree of regret by some of...
View ArticleWhen (and how) to move an InnoDB table outside the shared tablespace
In my last post, “A closer look at the MySQL ibdata1 disk space issue and big tables,” I looked at the growing ibdata1 problem under the perspective of having big tables residing inside the so-called...
View ArticleClik here to view.
MySQL 5.6 Transportable Tablespaces best practices
In MySQL 5.6 Oracle introduced a Transportable Tablespace feature (copying tablespaces to another server) and Percona Server adopted it for partial backups which means you can now take individual...
View ArticleClik here to view.
Deep dive into MySQL’s innochecksum tool
One of our Percona Support customers recently reported that Percona XtraBackup failed with a page corruption error on an InnoDB table. The customer thought it was a problem or bug in the Percona...
View ArticleClik here to view.
Illustrating Primary Key models in InnoDB and their impact on disk usage
On a recent engagement I worked with a customer who makes extensive use of UUID() values for their Primary Key and stores it as char(36), and their row count on this example table has grown to over 1...
View Article