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Identifying Resource Bottlenecks – Disk
With a discussion on identifying CPU and Memory bottlenecks achieved, let us now look at how Disk can affect MySQL performance. One of the first steps when addressing a MySQL performance tuning problem is to perform a system audit of the physical hardware resources (CPU,Memory,Disk,Network), then identify any obvious bottlenecks in these resources.
Read moreMy favorite MySQL data type – DECIMAL(31,0)
It may seem hard to believe, but I have seen DECIMAL(31,0) in action on a production server. Not just in one column, but in 15 columns just in the largest 4 tables of one schema.
Read moreMySQL SHOW PRIVILEGES
Some days you learn about MySQL commands even without knowing about them. Today I wanted to check the privileges a user had because they did not have permissions to drop a view.
Read moreMore woes with java version on Ubuntu
Armed with more information on Drizzle JDBC being a JDBC 4.0 implementation (helps to explain my issues in Getting started with Drizzle JDBC ) I took the time to read about some other new JDBC 4.
Read moreGetting started with Drizzle JDBC
In preparation for some Java work I wanted to configure and test the Drizzle JDBC Driver. Any chance to swing Drizzle into a MySQL discussion is worth the research. What I found was an issue compiling and an issue running on Ubuntu 9.
Read moreEngine agnostic MySQL test cases
Mark writes Now we all need the storage-engine independent test suite . I could not agree more. I have made comments about this probably as early as 4 years ago, and both before and while working for MySQL Inc.
Read moreHow do I create a simple MySQL database
I was asked this question recently “I am wanting to create a simple MySQL database consisting of 5 tables”? While it’s easy to tell people to RTFM, the question does warrant an answer for the MySQL beginner to provide a more specific guidance as to where to start, and what to do.
Read moreHow do I find the storage engine of a MySQL table
This seems quite a trivial question, but developers don’t often know what a MySQL storage engine is and how to determine what storage engine is used for a table. The first choice is to describe the table with the DESC[RIBE] command.
Read moreMonitoring MySQL – The error log
It is important that you monitor the MySQL error log. There are a few different options available for defining the details of the log. If not specified the default is [datadir]/[hostname].
Read moreExplain this
The EXPLAIN command is an important tool to review how a SQL query is executed and in this example includes what indexes are used. By adding a covering index I ended up with the following EXPLAIN plan I was unable to explain.
Read moreMySQL Replication 102
One of the most asked questions is how to setup MySQL replication. The MySQL Reference Manual provides a good Replication How To as a starting guide on MySQL Replication 101.
Read moreWhere can you find MySQL Events?
As a frequent traveler for my MySQL consulting (last 4 weeks were Sydney, San Francisco, New York and Vancouver), I like to keep abreast of any local tech event that includes MySQL that I may be able to attend.
Read moreInnoDB I_S.tables.table_rows out by a factor of 100x
I’ve always believed that the MySQL Information_schema.tables.table_rows figure for Innodb tables to be while approximate, approximately accurate. Today I found that the figures varied on one table from 10x to 100x wrong.
Read moreMySQL DML stats per table
MySQL provides a level of statistics for your INSERT, UPDATE, DELETE, REPLACE Data Manipulation Language (DML) commands using the STATUS output of various Com_ variables, however it is per server stats.
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