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10 Newer Entries Showing entries 91 to 100 of 1175 10 Older Entries

Displaying posts with tag: Databases (reset)

MySQL Puppet Module and Slides
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During yesterday’s MySQL Connect conference, Brandon Johnson and I gave a joint talk about how Mozilla uses puppet to manage hundreds of MySQL servers efficiently. We also released our mysql puppet module on github, so that all can benefit. The slides for the talk are at http://bit.ly/puppet-mysql-slides.

Upgrading to MySQL 5.6 Slides
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I am about to give a talk at MySQL Connect about what you need to know before upgrading to MySQL 5.6.

The PDF slides are online at http://bit.ly/upgrade56. I will be posting a video in the next few weeks!

A Brief Introduction to MySQL Fabric
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As you saw on the keynote, we are introducing an integrated framework for managing farms of MySQL servers with support for both high-availability and sharding. It should be noted that this is a very early alpha and that it at this point is not ready for production use.

MySQL Fabric is an integrated system for managing a collection of MySQL servers and is the framework on which high-availability and sharding is built. MySQL Fabric is open-source and is intended to be extensible, easy to use, and support procedure execution even in the presence of failure, an execution model we call resilient execution.

To …



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Second Madrid MySQL Users Group taking place tomorrow Thursday, 12th September
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If you happen to have some free time tomorrow and are in Madrid please come along to the second Madrid MySQL Users Group.

Details can be found here. The meeting will be in Spanish. I look forward to seeing you.

Video: Getting Started with Performance Schema
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Recently I gave a new talk to both the Tokyo and Boston MySQL User Groups about how to get started using performance schema. I have put some resources online for those interested:

Performance Schema talk video

PDF slides

The feedback has been excellent, so I hope that you find this video useful when trying to learn how to use performance schema and dive into the depth of the information it provides you.

Measuring MySQL Query Performance
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Measuring how well a MySQL is doing can be tough – most metrics are simply proxies for actual performance. Thankfully, the Percona build of MySQL allows you to see exactly how long your queries are taking. It provides a diagnostic view that shows how long queries take, allowing you to gauge its real-world performance. I’ll get to that in a little bit. Before we do that, I want to talk about some other tools you can use.

You can dump the …

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Additional DB objects in AWS RDS
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To expand on Jervin’s Default RDS Account Privileges, RDS for MySQL provides a number of routines and triggers defined the the ‘mysql’ meta schema. These help in various tasks because the SUPER privilege is not provided.

SELECT routine_schema,routine_name
FROM information_schema.routines;
+----------------+-----------------------------------+
| routine_schema | routine_name                      |
+----------------+-----------------------------------+
| mysql          | rds_collect_global_status_history |
| mysql          | rds_disable_gsh_collector …
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MySQL MHA and Perl pathing
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I am certainly not a knowledgeable Perl person, however I recently ran into the error Can’t locate MHA/MasterMonitor.pm on Red Hat 6.x. I have installed MySQL MHA on various systems before without any issues.

$ masterha_manager -version
Can't locate MHA/MasterMonitor.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .) at /usr/bin/masterha_manager line 26.
BEGIN failed--compilation aborted at /usr/bin/masterha_manager line 26.

The issue was that MySQL …

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Cloning MySQL 5.6 instances
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A tip for all those cloud users that like cloning database servers (as reported in my book Effective MySQL – Replication Techniques in Depth).

Starting with MySQL 5.6, MySQL instances have a UUID. Cloning servers to quickly create slaves will result in the following error message.

mysql> SHOW SLAVE STATUSG
...
  Last_IO_Error: Fatal error: The slave I/O thread stops because master and slave have equal MySQL server UUIDs; these UUIDs must be different for …
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Unnecessary 3am (emergency) call
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Help, the database is on fire. Well, it probably is but the solution may also be easy. Here are a few steps for the part-time MySQL DBA/sysadmin/developer. Total time to address this solution was 2 minutes, the inability to not go back to sleep, not priceless.

First, access to the DB server is possible, and also the mysql command line client. If you are getting “Too Many Connections” read Why GRANT ALL is bad.

Given the message “the database is on fire”, the likely cause is rogue SQL.

mysql> show global variables like …
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10 Newer Entries Showing entries 91 to 100 of 1175 10 Older Entries

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