Tag: MySQL

Log Buffer #181: A Carnival of the Vanities for DBAs

The 181st edition of Log Buffer has been published by Gary Myers on his Sydney Oracle Lab.

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Database tuning: ratio vs. rate

If I told you that your database had a ratio of temporary tables written to disk of 20%, you might think “aha, my database is slow because of a lot of file I/O caused by writing temporary tables to disk!”. However, that 20% ratio may actually mean a rate of 2 per hour — which is most likely not causing excessive I/O. To get a sense of this concept, and also how mysqltuner works, I will show the lines from the mysqltuner default configuration that deal with temporary tables written to disk.

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When the ALTER TABLE privilege is not enough to run ALTER TABLE

I recently granted ALTER access in MySQL so a user could run the ALTER TABLE command . However after I granted the necessary privileges, the user was still not able to perform the tasks needed. Then I realized what the issue was and how to fix it.

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Log Buffer #180: A Carnival of the Vanities for DBAs

Hello and welcome to Log Buffer #180. Time’s a-wastin’, so let’s go!

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Applying binary logs without adding to the binary log

Applying binary logs to a MySQL instance is not particularly difficult, using the mysqlbinlog command line utility. Turning off binary logging for a session is not difficult, from the MySQL commandline, if you authenticate as a user with the SUPER privilege.sometimes you want to apply binary logs to a MySQL instance, without having those changes applied to the binary logs themselves. One option is to restart the server binary logging disabled, and after the load is finished, restart the server with binary logging re-enabled. This is not always possible nor desirable, so there’s a better way, that works in at least versions 4.1 and up

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Product management, effective developers, and the future of MySQL

Here’s the future of MySQL, Drizzle, Monty Program, the Percona fork, etc. The best product management strategies… should we be lightweight for the web, plug-in oriented like Drizzle? Should we follow Monty’s giant-killing roadmap? Should we focus on performance-oriented patches? The best product management strategies will win. They can’t win alone. Will they be backed by appropriate investments from effective developers? Effective developers are the ones who convert winning product management strategies into working products. You can’t get there without them and I’ve seen lots of great strategies fail that test (including my own actually). And there can be more than one winner.

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Community dinner at Pedro’s during the O’Reilly MySQL Conference

I was sad that last year there was no community dinner, and I missed the one the year before when Jonathan Schwartz and Rich Green made an appearance. This year I am determined not to miss it, and so I am calling for a community (pay-your-own-way) dinner on Monday, April 12th, at Pedro’s

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Log Buffer #179: A Carnival of the Vanities for DBAs

You have found the 179th edition of Log Buffer, the weekly review of database blogs. Welcome. Enjoy your stay. We begin with . . .

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How to tell when using INFORMATION_SCHEMA might crash your database

There are those that are very adamant about letting people know that using INFORMATION_SCHEMA can crash your database. Of course they leave out one extremely important piece of information: you can actually figure out how dangerous your INFORMATION_SCHEMA query will be, ahead of time, using EXPLAIN. Here’s how.

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Pythian Launches ISV Partner Program

Pythian has launched a Partner Program to assist Independent Software Vendors (ISVs), whose applications have intensive database requirements. We assist their client base by helping them correctly plan, deploy, and manage the underlying database infrastructure, be it MySQL, Oracle or SQL Server, to ensure the ISV customers’ software environment is sound, and performs well over time.

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