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10 Newer Entries Showing entries 31 to 40 of 72 10 Older Entries

Displaying posts with tag: Percona Toolkit (reset)

Percona Software in Ubuntu 14.04 LTS (Trusty Tahr) release
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I’d like to congratulate Canonical with the new Ubuntu 14.04 LTS (Trusty Tahr) Release, it really looks like a great release, and I say it having my own agenda It looks even more great because it comes with a full line of Percona Software.
If you install Ubuntu 14.04 and run aptitude search you will find:


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How to log slow queries on Slave in MySQL 5.0 with pt-query-digest
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Working as a Percona Support Engineer, every day we are seeing lots of issues related to MySQL replication. One very common issue is slave lagging. There are many reasons for slave lag but one common reason is that queries are taking more time on slave then master. How to check and log those long-running queries?  From MySQL 5.1, log-slow-slave-statements variable was introduced, which you can …

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Tools and tips for analysis of MySQL’s Slow Query Log
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MySQL has a nice feature, slow query log, which allows you to log all queries that exceed a predefined about of time to execute. Peter Zaitsev first wrote about this back in 2006 – there have been a few other posts here on the MySQL Performance Blog since then (check …

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Percona Toolkit 2.1.11 is now available
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Percona is glad to announce the release of Percona Toolkit 2.1.11 on March 4th, 2013 (Downloads are available here).

Bugs Fixed:
Fixed bug 1279502: –version-check behaves like spyware

The configuration for what information Percona Toolkit should retrieve is not hard-coded in the …


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How to monitor ALTER TABLE progress in MySQL
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While working on a recent support issue as a Percona Support Engineer,  I got one question from a customer asking how to monitor ALTER TABLE progress. Actually, for MySQL 5.5 and prior versions, it’s quite difficult to ALTER the table in a running production environment especially for large tables (with millions records). Because it will rebuild and lock the table affecting the performance as well as our users. Therefore even if we start ALTER it’s really important to know when it will …

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Abdel-Mawla Gharieb: Online DDL vs pt-online-schema-change
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One of the most expensive database operations is performing Data Definition Language (DDL, e.g. CREATE, DROP, ALTER, etc.) statements, specially, the ALTER statements because MySQL blocks the entire table for both reads and writes while modifying the table.

For the huge tables, this might take hours to get the table changed which affects the application, so that, a good planning is required for such operations in order to avoid doing these changes during the peak times. For those people who have 24/7 services or limited maintenance window, DDL on huge tables is a really nightmare.

Percona developed a very good tool called …

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Percona Toolkit collection: pt-visual-explain
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This is the first in a series of posts highlighting a few of the seldom-used but still handy Percona Toolkit tools.

Have you ever had a problem understanding the EXPLAIN statement output? And are you the type of person who would rather use the command line than a GUI application? Then I would recommend that you use Percona’s pt-visual-explain toolkit. This is one of many Percona Toolkit tools that is useful for those who want to have a different view and an easier time understanding the EXPLAIN output aside from the usual table and vertical …

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Percona Toolkit 2.2.6 is now available
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Percona is glad to announce the release of Percona Toolkit 2.2.6 on December 20th, 2013 (Downloads are available here and from the Percona Software Repositories). This release is the current GA (Generally Available) …

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Integrating pt-online-schema-change with a Scripted Deployment
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Recently, I helped a client that was having issues with deployments causing locking in their production databases.  At a high level, the two key components used in the environment were:

  • Capistrano (scripted deployments) [website]
  • Liquibase (database version control) [website]

At a high level, they currently used a CLI call to Liquibase as a sub-task within a larger deployment task.  The goal of this engagement was to modify that sub-task to run Liquibase in a …

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Quick link to Percona Toolkit bugs
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In this post I wanted to highlight

percona.com/bugs/<tool>

 , for example: percona.com/bugs/pt-stalk.  This only works for Percona Toolkit.  We often advise people to check a tool’s current bugs, but we don’t always say how.

The official link for Percona Toolkit bugs on Launchpad is  …

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10 Newer Entries Showing entries 31 to 40 of 72 10 Older Entries

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