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10 Newer Entries Showing entries 61 to 70 of 16519 10 Older Entries

Displaying posts with tag: mysql (reset)

Get a handle on your HA at Percona Live London 2014
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From left: Liz van Dijk, Frédéric Descamps and Kenny Gryp

If you’re following this blog, it’s quite likely you’re already aware of the Percona Live London 2014 conference coming up in just a few days. Just in case, though (you know, if you’re still looking for an excuse to sign up), I wanted to put a spotlight on  …

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The Perfect Server – CentOS 7 (Apache2, Dovecot, ISPConfig 3)
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The Perfect Server – CentOS 7 (Apache2, Dovecot, ISPConfig 3)

This tutorial shows how to prepare a CentOS 7 x86_64 server for the installation of ISPConfig 3 and how to install ISPConfig 3. ISPConfig 3 is a webhosting control panel that allows you to configure the following services through a web browser: Apache web server, Postfix mail server, MySQL, BIND nameserver, PureFTPd, SpamAssassin, ClamAV, Mailman, and many more.

Geohash Functions
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In MySQL 5.7.5, we introduced new functions for encoding and decoding Geohash data. Geohash is a system for encoding and decoding longitude and latitude coordinates in the WGS 84 coordinate system, into a text string. In this blog post we will take a brief look at a simple example to explain just how geohash works.

Where on earth is “u5r2vty0″?

Imagine you get a email from your friend, telling you that there is free food at “u5r2vty0″. But where on earth is “u5r2vty0″?

The …

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How to deal with MySQL deadlocks
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A deadlock in MySQL happens when two or more transactions mutually hold and request for locks, creating a cycle of dependencies. In a transaction system, deadlocks are a fact of life and not completely avoidable. InnoDB automatically detects transaction deadlocks, rollbacks a transaction immediately and returns an error. It uses a metric to pick the easiest transaction to rollback. Though an occasional deadlock is not something to worry about, frequent occurrences call for attention.

Before MySQL 5.6, only the latest deadlock can be reviewed using SHOW ENGINE INNODB STATUS command. But with Percona Toolkit’s …

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Resolving page corruption in compressed InnoDB tables
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Sometimes corruption is not the true corruption. Corruption in compressed InnoDB tables may be a false positive.

Compressed InnoDB table may hit false checksum verification failure. The bug (http://bugs.mysql.com/bug.php?id=73689) reveals itself in the error log as follows:

2014-10-18 08:26:31 7fb114254700 InnoDB: Compressed page type (17855); stored checksum in field1 0; calculated checksums for field1: crc32 4289414559, innodb 0, none 3735928559; page LSN 24332465308430; page number (if stored to page already) 60727; space id (if stored to page already) 448
InnoDB: Page …
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Data Warehouse in the Cloud - How to Upload MySQL data into Amazon Redshift for reporting and analytics
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October 27, 2014 By Severalnines

The term data warehousing often brings to mind things like large complex projects, big businesses, proprietary hardware and expensive software licenses. With Hadoop came open source data analysis software that ran on commodity hardware, this helped address at least some of the cost aspects. We had previously blogged about MongoDB and …

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Refactoring replication topologies with Pseudo GTID: a visual tour
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Orchestrator 1.2.1-beta supports Pseudo GTID (read announcement): a means to refactor the replication topology and connect slaves even without direct relationship; even across failed servers. This post illustrates two such scenarios and shows the visual way of mathcing/re-synching slaves.

Of course, orchestrator is not just a GUI tool; anything done with drag-and-drop …

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Orchestrator 1.2.1 BETA: Pseudo GTID support, reconnect slaves even after master failure
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orchestrator 1.2.1 BETA is released. This version supports Pseudo GTID, and provides one with powerful refactoring of one's replication topologies, even across failed instances.

Depicted: moving a slave up the topology even though …

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When your query is blocked, but there is no blocking query - Part 3
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In the previous blog posts I've talked about transactions which block other transactions but don't do anything and about some possible solutions.

In this post I will show you how to get even more information about what is locked by a transaction.

As you might have noticed the information_schema.innodb_locks table doesn't show all locks. This is what the …



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MariaDB 10.1.1 Overview and Highlights
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MariaDB 10.1.1 was recently released, and is available for download here:

https://downloads.mariadb.org/mariadb/10.1.1/

This is the second alpha release of MariaDB 10.1, so there are a lot of new changes and functionalities added, and many, many bugs fixed (I counted 637). Since it’s alpha, I’ll only cover the major changes and additions, as there are a lot of great new features, and omit covering any of the bug fixes (feel free to browse them all here).

To me, these are …

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10 Newer Entries Showing entries 61 to 70 of 16519 10 Older Entries

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