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Showing entries 1 to 10 of 16964 10 Older Entries

Displaying posts with tag: mysql (reset)

MySQL Query Profiling with Performance Schema
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One of my favorite tools for query optimization is profiling. But recently I noticed this warning:

mysql> set profiling=1;
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> show warnings;
+---------+------+----------------------------------------------------------------------+
| Level   | Code | Message                                                              |
+---------+------+----------------------------------------------------------------------+
| Warning | 1287 | '@@profiling' is deprecated and will be removed in a future release. |
+---------+------+----------------------------------------------------------------------+

After looking through …

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Introducing MySQL Performance Analyzer
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At Yahoo, we manage a massive number of MySQL databases spread across multiple data centers. 

In order to identify and respond to performance issues, we rely on an extremely lightweight and robust web based tool to proactively investigate the issues in them.

The tool has real time tracking features and continually gathers the most important performance metrics, provides visualization and statistical analysis for quickly identifying performance patterns, bottlenecks and possible tuning opportunities.

Features

  • Lightweight Agentless Java Web Application
  • Rich User Interface
  • Gather and Store …


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Decrypt .mylogin.cnf
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General-purpose MySQL applications should read MySQL option files like /etc/my.cnf, ~/.my.cnf, ... and ~/.mylogin.cnf. But ~/.mylogin.cnf is encrypted. That's a problem for our ocelotgui GUI application, and I suppose other writers of Linux applications could face the same problem, so I'll share the code we'll use to solve it.

First some words of defence. I think that encryption (or more correctly obfuscation) is okay as an option: a customer asked for it, …

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Creating and Restoring Database Backups With mysqldump and MySQL Enterprise Backup – Part 2 of 2
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In part one of this post, I gave you a couple examples of how to backup your MySQL databases using mysqldump. In part two, I will show you how to use the MySQL Enterprise Backup (MEB) to create a full and partial backup.



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Percona XtraBackup 2.3.1-beta1 is now available
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Percona is glad to announce the release of Percona XtraBackup 2.3.1-beta1 on May 20th 2015. Downloads are available from our download site here. This BETA release, will be available in Debian

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More Cores or Higher Clock Speed?
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This is a little quiz (could be a discussion). I know what we tend to prefer (and why), but we’re interested in hearing additional and other opinions!

Given the way MySQL/MariaDB is architected, what would you prefer to see in a new server, more cores or higher clock speed? (presuming other factors such as CPU caches and memory access speed are identical).

For example, you might have a choice between

  • 2x 2.4GHz 6 core, or
  • 2x 3.0GHz 4 core

which option would you pick for a (dedicated) MySQL/MariaDB server, and why?

And, do you regard the “total speed” (N cores * GHz) as relevant in the decision process? If so, when and to what degree?

Creating and Restoring Database Backups With mysqldump and MySQL Enterprise Backup – Part 1 of 2
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Part 1 of 2: (part two)
If you have used MySQL for a while, you have probably used mysqldump to backup your database. In part one of this blog, I am going to show you how to create a simple full and partial backup using mysqldump. In …

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MariaDB Galera Cluster 10.0.19 and 5.5.43 now available
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Download MariaDB Galera Cluster 10.0.19

Release Notes Changelog What is MariaDB Galera Cluster?

Download MariaDB Galera Cluster 5.5.43

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Bash Arrays & MySQL
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Student questions are always interesting! They get me to think and to write. The question this time is: “How do I write a Bash Shell script to process multiple MySQL script files?” This post builds the following model (courtesy of MySQL Workbench) by using a bash shell script and MySQL script files, but there’s a disclaimer on this post. It shows both insecure and secure approaches and you should avoid the insecure ones.

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My thoughts on Architecture and Software Development with MySQL
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Yesterday I was able to present to the Portland MySQL Users Group two presentations that are important foundations for effective development with MySQL.


Download Architecture Presentation


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Showing entries 1 to 10 of 16964 10 Older Entries

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