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10 Newer Entries Showing entries 31 to 40 of 67 10 Older Entries

Displaying posts with tag: Percona Toolkit (reset)

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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How to reclaim space in InnoDB when innodb_file_per_table is ON
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When innodb_file_per_table is OFF and all data is going to be stored in ibdata files. If you drop some tables of delete some data then there is no any other way to reclaim that unused disk space except dump/reload method.

When Innodb_file_per_table is ON, each table stores data and indexes in it’s own tablespace file. However, the shared tablespace-ibdata1 can still grow and you can check more information here about why it grows and what are the solutions.

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How InnoDB promotes UNIQUE constraints
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The other day I was running pt-duplicate-key-checker on behalf of a customer and noticed some peculiar recommendations on an InnoDB table with an odd structure (no PRIMARY key, but multiple UNIQUE constraints). This got me thinking about how InnoDB promotes UNIQUE constraints to the role of PRIMARY KEYs. The documentation is pretty clear:

[DOCS]
When you define a PRIMARY KEY on your table, InnoDB uses it as the clustered index. …

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Converting an OLAP database to TokuDB, part 2: the process of migration
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This is a second in a series of posts describing our experience in migrating a large DWH server to TokuDB. This post discusses the process of migration itself.

As a quick recap (read part 1 here), we have a 2TB compressed InnoDB (4TB uncompressed) based DWH server. Space is running low, and we're looking at TokuDB for answers. Early experiments show that TokuDB's compression could make a good impact on disk space usage. I'm still not discussing performance -- keeping this …

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Want to archive tables? Use Percona Toolkit’s pt-archiver
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Percona Toolkit’s pt-archiver is one of the best utilities to archive the records from large tables to another tables or files. One interesting thing is that pt-archiver is a read-write tool. It deletes data from the source by default, so after archiving you don’t need to delete it separately.

As it is done by default, you should take care before actually running it on then production …

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The top 5 proactive measures to minimize MySQL downtime
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I’m happy to announce that the recording for my recent webinar “5 Proactive Measures to Minimize MySQL Downtime” is now available, along with the slides. They can both be found …

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10 Newer Entries Showing entries 31 to 40 of 67 10 Older Entries

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