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Virident vCache vs. FlashCache: Part 2

May 17, 2013 By Ernie Souhrada 3 Comments

This is the second part in a two-part series comparing Virident’s vCache to FlashCache. The first part was focused on usability and feature comparison; in this post, we’ll look at some sysbench test results. Disclosure: The research and testing conducted for this post were sponsored by Virident. First, some background information. All tests were conducted [...]

Filed Under: Benchmarks, Hardware and Storage, MySQL Tagged With: Benchmarks, Ernie Souhrada, FlashCache, MLC, PCIe, sysbench, vCache, Virident

Is Synchronous Replication right for your app?

May 14, 2013 By Jay Janssen 16 Comments

I talk with lot of people who are really interested in Percona XtraDB Cluster (PXC) and mostly they are interested in PXC as a high-availability solution. But, what they tend not to think too much about is if moving from async to synchronous replication is right for their application or not. Facts about Galera replication [...]

Filed Under: MySQL, Percona Software, XtraDB Cluster Tagged With: async, Galera replication, hotspots, Jay Janssen, Percona XtraDB Cluster, pxc, Synchronous Replication

Percona XtraBackup 2.1.0 ‘release candidate’ for MySQL available for download

May 7, 2013 By Hrvoje Matijakovic Leave a Comment

Percona is glad to announce the release of Percona XtraBackup 2.1.0-rc1 on May 7, 2013. Downloads are available from our download site here. For this RC release, we will not be making APT and YUM repositories available, just base deb and RPM packages This is an Release Candidate quality release and is not intended for [...]

Filed Under: MySQL, Percona Software Tagged With: InnoDB, MySQL hot backup software, Percona XtraBackup, XtraDB

Rotating MySQL slow logs safely

April 18, 2013 By Peter Boros 7 Comments

This blog post is part two of two. Like part one, published Wednesday, this is a cross-post from Groupon’s engineering blog. Thanks again to Kyle Oppenheim at Groupon. And one more reminder that I’ll be at the Percona Live MySQL Conference and Expo next week in Santa Clara, California so look for me there. You [...]

Filed Under: Insight for DBAs, MySQL Tagged With: copytruncate, FLUSH LOGS, Groupon, Kyle Oppenheim, Logrotate, MySQL slow logs, no copytruncate, Peter Boros

InnoDB Full-text Search in MySQL 5.6: Part 2, The Queries!

March 4, 2013 By Ernie Souhrada 7 Comments

This is part 2 in a 3 part series. In part 1, we took a quick look at some initial configuration of InnoDB full-text search and discovered a little bit of quirky behavior; here, we are going to run some queries and compare the result sets. Our hope is that the one of two things [...]

Filed Under: Insight for DBAs, Insight for Developers, MySQL Tagged With: Ernie Souhrada, FTS, FullText Search, InnoDB, MyISAM, MySQL 5.6

Sphinx search performance optimization: multi-threaded search

January 16, 2013 By Aurimas Mikalauskas 6 Comments

Queries in MySQL, Sphinx and many other database or search engines are typically single-threaded. That is when you issue a single query on your brand new r910 with 32 CPU cores and 16 disks, the maximum that is going to be used to process this query at any given point is 1 CPU core and [...]

Filed Under: MySQL Tagged With: FullText Search, Performance, Sphinx, Tips

Announcing Percona Server 5.1.66-14.2

January 15, 2013 By Hrvoje Matijakovic Leave a Comment

Percona is glad to announce the release of Percona Server 5.1.66-14.2 on January 15th, 2013 (Downloads are available here and from the Percona Software Repositories). Based on MySQL 5.1.66, including all the bug fixes in it, Percona Server 5.1.66-14.2 is now the current stable release in the 5.1 series. All of Percona‘s software is open-source and free, all the details of the release can [...]

Filed Under: Events and Announcements, MySQL, Percona Software Tagged With: Percona Server 5.1.66-14.2

The Optimization That (Often) Isn’t: Index Merge Intersection

December 14, 2012 By Ernie Souhrada 6 Comments

Prior to version 5.0, MySQL could only use one index per table in a given query without any exceptions; folks that didn’t understand this limitation would often have tables with lots of single-column indexes on columns which commonly appeared in their WHERE clauses, and they’d wonder why the EXPLAIN plan for a given SELECT would [...]

Filed Under: Insight for DBAs, Insight for Developers, MySQL

Recovery after DROP & CREATE

August 22, 2012 By Aleksandr Kuzminsky 1 Comment

In a very popular data loss scenario a table is dropped and empty one is created with the same name. This is because mysqldump in many cases generates the “DROP TABLE” instruction before the “CREATE TABLE”:

DROP TABLE IF EXISTS `actor`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `actor` (
  `actor_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `first_name` varchar(45) NOT NULL,
  `last_name` varchar(45) NOT NULL,
  `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`actor_id`),
  KEY `idx_actor_last_name` (`last_name`)
) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8;
/*!40101 SET character_set_client = @saved_cs_client */;

DROP TABLE IF EXISTS `actor`;

/*!40101 SET @saved_cs_client = @@character_set_client */;

/*!40101 SET character_set_client = utf8 */;

CREATE TABLE `actor` (

`actor_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,

`first_name` varchar(45) NOT NULL,

`last_name` varchar(45) NOT NULL,

`last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

PRIMARY KEY (`actor_id`),

KEY `idx_actor_last_name` (`last_name`)

) ENGINE=InnoDB AUTO_INCREMENT=201 DEFAULT CHARSET=utf8;

/*!40101 SET character_set_client = @saved_cs_client */;

If there were no subsequent CREATE TABLE the recovery would be trivial. Index_id of the PRIMARY index of [...]

Filed Under: MySQL Tagged With: drop table, InnoDB, Recovery

Percona XtraDB Cluster: Multi-node writing and Unexpected deadlocks

August 17, 2012 By Jay Janssen 17 Comments

Percona XtraDB Cluster (PXC) and the technology it uses (Galera) is an exciting alternative to traditional MySQL replication. For those who don’t know, it gives you: Fully Synchronous replication with a write latency increase equivalent to a ping RTT to the furthest node Automatic cluster synchronization, both incremental and full restores The ability to read [...]

Filed Under: MySQL, XtraDB Cluster

Virident vCache vs. FlashCache: Part 2

Is Synchronous Replication right for your app?

Percona XtraBackup 2.1.0 ‘release candidate’ for MySQL available for download

Rotating MySQL slow logs safely

InnoDB Full-text Search in MySQL 5.6: Part 2, The Queries!

Sphinx search performance optimization: multi-threaded search

Announcing Percona Server 5.1.66-14.2

The Optimization That (Often) Isn’t: Index Merge Intersection

Recovery after DROP & CREATE

Percona XtraDB Cluster: Multi-node writing and Unexpected deadlocks

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