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10 Newer Entries Showing entries 11 to 20 of 33483 10 Older Entries
MySQL Workbench 6.2
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MySQL Workbench 6.2 (6.2.4 GA, published on Thursday, 20 Nov 2014)

How a set of queries can be killed in MySQL using Percona Toolkit’s pt-kill
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You might have encountered situations where you had to kill some specific select queries that were running for long periods and choking the database. This post will go into more detail with an example of report query offloading.

Report query (select) offloading to a slave server is a common practice to reduce the workload of the master DB server. The long running selects will be executed in the slave for report generation. I have observed in many cases where the slave used to get delayed or the slave DB encounters a slowdown due to some heavy long-running orphaned selects from some wrong reports.

There are two …

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New ClusterControl User Guide for MySQL based Clusters
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November 19, 2014 By Severalnines

Following the release of ClusterControl 1.2.8 with a range of cool new features, we have now also published a new ClusterControl User Guide that provides all the steps, tips & tricks to follow in order to successfully deploy, monitor, manage and scale database clusters.  

This user guide predominantly covers ClusterControl with MySQL-based clusters, namely:

  • Percona XtraDB Cluster
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New XAMPP with PHP 5.5.19 & 5.6.3 versions
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Hi Apache Friends!

We just released new versions of XAMPP for all platforms with latest PHP versions: 5.5.19 and 5.6.3. We simplified the versioning for XAMPP releases and we now base the version number on the bundled PHP version, so you can more easily tell what is in the stack.

In addition to the component upgrades below, we also included a new beta Welcome page, which includes new tutorials. We will continue to add more and would love to get your feedback!

The following guides are available for Windows and Linux in the current versions:

  • Backup and Restore MySQL Databases
  • Configure FTP Access
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Analyzing Prepared Statement Performance With VividCortex
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Optimizing MySQL performance requires the ability to inspect production query traffic. If you’re not seeing your application’s production workload, you’re missing a vital part of the picture. In particular, there are lots of performance optimizations your systems might be doing that you’re not aware of. One of these is using prepared statements for queries.

What Are Prepared Statements?

A prepared statement is a SQL statement with parameter placeholders which is sent to the database server and prepared for repeated execution. It’s a performance optimization as well as a security measure; it protects …

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Avoiding MySQL ALTER table downtime
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MySQL table alterations can interrupt production traffic causing bad customer experience or in worst cases, loss of revenue. Not all DBAs, developers, syadmins know MySQL well enough to avoid this pitfall. DBAs usually encounter these kinds of production interruptions when working with upgrade scripts that touch both application and database or if an inexperienced admin/dev engineer perform the schema change without knowing how MySQL operates internally.

Truths
* Direct MySQL ALTER table locks for duration of change (pre-5.6)
* Online DDL in MySQL 5.6 is not always online and may incurr locks
* Even with …


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MySQL’s INNODB_METRICS table: How much is the overhead?
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Starting with MySQL 5.6 there is an INNODB_METRICS table available in INFORMATION_SCHEMA which contains some additional information than provided in the SHOW GLOBAL STATUS output – yet might be more lightweight than PERFORMANCE_SCHEMA.

Too bad INNODB_METRICS was designed during the Oracle-Sun split under MySQL leadership and so it covers only InnoDB counters. I think this would be a great replacement to all counters that are currently provided though SHOW STATUS – it captures more information such as providing MIN/MAX counts for …

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GDB Tips: Inspecting MySQL Plugin Variables in Core File
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Recently I had a need to determine the session value of a MySQL plugin variable in a core file.  Here I use the word plugin variable to refer to MySQL system variables provided by plugins.  While this is not a very difficult task, it is not as straight forward as printing a global variable. It took some time to figure out the layout of the plugin variables and get the needed information. This short article is to share this gdb tip with other interested MySQL developers and support engineers.

In this article, let us inspect the …

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Optimising multi-threaded replication
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Multi-threaded replication is a new feature introduced in MySQL 5.6 and MariaDB 10.0. In traditional single-threaded replication, the slaves have a disadvantage as they have to process in sequence what a master executed in parallel. This, plus the fact that slaves usually have a lot of read-only connections to deal with as well, can easily create performance problems. That is, a single-threaded slave …

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Percona Toolkit 2.2.12 is now available
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Percona is pleased to announce the availability of Percona Toolkit 2.2.12.  Released on November 14, Percona Toolkit is a collection of advanced command-line tools to perform a variety of MySQL server and system tasks that are too difficult or complex for DBAs to perform manually. Percona Toolkit, like all Percona software, is free and open source.

This release is the current GA (Generally Available) stable …

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10 Newer Entries Showing entries 11 to 20 of 33483 10 Older Entries

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