MySQL

Nagios Check Calculated on Mysql Server Variables

Nagios Check For Calculating Based on Mysql Server Variables Recently we needed to make a change for a client to one of our mysql monitoring tools so I thought it would be a good opportunity to highlight the tool and discuss some of the changes that I made. You can access the tool on Github…

Log Buffer #253, A Carnival of the Vanities for DBAs

A very very Happy New Year 2012 to all of you. These are the festive and jubilant times when people look back on previous years and make plans for their new year and beyond. Well, this Log Buffer Edition is no different. This week covers the new year posts of the bloggers across the database arena in Log Buffer #253.

Log Buffer #252, A Carnival of the Vanities for DBAs

As we all look forward eagerly to 2012, bloggers around the gblobe are writing about their insightful reflections on 2011. You’re also welcome to write your’s regarding to database arena in the comments, if you like. This Log Buffer Edition welcomes you to the new year with festive posts from Oracle, SQL Server and MySQL bloggers in Log Buffer #252.

Log Buffer #251, A Carnival of the Vanities for DBAs

ew Year is the time to bid farewell to the old year and welcome the coming year. It is the time to remember the golden olden blog posts. It is the time for new beginnings and new starts in life, and of course for new blog posts. Bloggers in the database arena are also enjoying the festivities with full zeal and zest and this Log Buffer Edition, which is Log Buffer #251 covers just that. Happy Holidays.

Once again about innodb-concurrency-tickets

I had to refresh my knowledge on how InnoDB threads queue works the other day when debugging activity spikes on one of the customer’s production system and while I had general idea about InnoDB kernel and queue, thread concurrency and queue join delays I didn’t have a complete model of how InnoDB concurrency control works. So I started from manual…

Hashing Algorithm in MySQL PASSWORD()

Recently we had a question from a customer: what is the hashing algorithm implemented in PASSWORD() ? The manual doesn’t give a straight answer in any of these two pages: http://dev.mysql.com/doc/refman/5.1/en/encryption-functions.html#function_password http://dev.mysql.com/doc/refman/5.1/en/password-hashing.html   It is enough to dig a bit more to find the solution in http://forge.mysql.com/wiki/MySQL_Internals_ClientServer_Protocol#4.1_and_later that specifies “mysql.user.Password stores SHA1(SHA1(password))” .   Instead of blindly…

Building libMemcached RPMs

A client running CentOS 5.4 Amazon EC2 instances needed the latest libMemcachedversion installed. With the inclusion of the “make rpm” target, libMemcached makes it easy to build the libMemcached RPMs by doing the following: Spin up a new CentOS Amazon EC2 instance, As root on the new instance: yum install @development-tools yum install fedora-packager /usr/sbin/useradd…

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