You searched for search index - Page 2 of 9

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

Tools and Techniques for Index Design Webinar Questions Followup

October 4, 2012 By Bill Karwin 5 Comments

I presented a webinar this week to give an overview of Tools and Techniques for Index Design. Even if you missed the webinar, you can register for it, and you’ll be emailed a link to the recording. I’d like to invite folks who are interested in tools for query optimization to attend the new Percona [...]

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

Visualization tools for pt-query-digest tables

August 31, 2012 By Roman Vynar 6 Comments

When you process MySQL slow query logs using pt-query-digest you can store samples of each query into query_review table and historical values for review trend analysis into query_review_history table. But it could be difficult to easily browse those tables without a good GUI tool. For the visual browsing of tables created by pt-query-digest you may [...]

Filed Under: Insight for DBAs, MySQL Tagged With: pt-query-digest

Sell-an-Elephant-to-your-Boss-HOWTO

August 28, 2012 By Aurimas Mikalauskas 3 Comments

Spoiler alert: If your boss does not need an elephant, he is definitely NOT going to buy one from you. If he will, he will regret it and eventually you will too. I must appologize to the reader who was expecting to find an advice on selling useless goods to his boss. While I do [...]

Filed Under: Insight for DBAs, Insight for Developers Tagged With: Ideas, Performance

Full Text Search Webinar Questions Followup

August 24, 2012 By Bill Karwin 5 Comments

I presented a webinar this week to give an overview of several Full Text Search solutions and compare their performance. Even if you missed the webinar, you can register for it, and you’ll be emailed a link to the recording. During my webinar, a number of attendees asked some good questions. Here are their questions and my [...]

Filed Under: Events and Announcements, 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

Webinar for Full Text Search Throwdown

August 21, 2012 By Bill Karwin 1 Comment

Tomorrow, August 22 at 10:00am PDT, I’ll present a webinar called Full Text Search Throwdown. This is a no-nonsense performance comparison of solutions for full text indexing for MySQL applications, including: LIKE predicates and regular expressions MyISAM FULLTEXT indexes InnoDB FULLTEXT indexes Apache Solr Sphinx Search Trigraphs I’ll compare the performance for building indexes and querying [...]

Filed Under: Events and Announcements, Insight for Developers, MySQL Tagged With: FullText Search, Performance, Sphinx

MySQL Indexing Best Practices: Webinar Questions Followup

August 16, 2012 By Peter Zaitsev 4 Comments

I had a lot of questions on my MySQL Indexing: Best Practices Webinar (both recording and slides are available now) We had lots of questions. I did not have time to answer some and others are better answered in writing anyway. Q: One developer on our team wants to replace longish (25-30) indexed varchars with [...]

Filed Under: Insight for DBAs, MySQL

Index Condition Pushdown in MySQL 5.6 and MariaDB 5.5 and its performance impact

March 12, 2012 By Ovais Tariq 12 Comments

I have been working with Peter in preparation for the talk comparing the optimizer enhancements in MySQL 5.6 and MariaDB 5.5. We are taking a look at and benchmarking optimizer enhancements one by one. So in the same way this blog post is aimed at a new optimizer enhancement Index Condition Pushdown (ICP). Its available [...]

Filed Under: Benchmarks, Insight for DBAs, MySQL Tagged With: Benchmarks, InnoDB, IO Performance, MariaDB, MySQL, MySQL Indexes, MySQL Performance, Optimizer

Sphinx 2.0.2 Beta is released, Sphinx Users Conference in December

November 17, 2011 By Peter Zaitsev 6 Comments

My friends at Sphinx Technologies have finally released new beta of Sphinx – Sphinx 2.0.2. It includes about 6 months of development and includes over 30 new features and tons of bug fixes. I’m happy to see how Sphinx 2.0 is shaping up a lot of rough corners are being polished and I’m hopeful we [...]

Filed Under: Cloud and NoSQL, MySQL

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

Tools and Techniques for Index Design Webinar Questions Followup

Visualization tools for pt-query-digest tables

Sell-an-Elephant-to-your-Boss-HOWTO

Full Text Search Webinar Questions Followup

Recovery after DROP & CREATE

Webinar for Full Text Search Throwdown

MySQL Indexing Best Practices: Webinar Questions Followup

Index Condition Pushdown in MySQL 5.6 and MariaDB 5.5 and its performance impact

Sphinx 2.0.2 Beta is released, Sphinx Users Conference in December

Search

Top Searches

Percona Webinars

ABOUT PERCONA

Percona MySQL Training

Percona Careers

SOFTWARE FROM PERCONA

SERVICES FOR MYSQL USERS

ABOUT THIS BLOG AND PERCONA