×
  • Share
  • Email
  • Embed
  • Like
  • Save
  • Private Content
 

Mysql Explain Explained

by MD at Magma Digital Ltd on Feb 19, 2009

  • 49,277 views

Adrian Hardy's slides from PHPNW08 ...

Adrian Hardy's slides from PHPNW08

Once you have your query returning the correct results, speed becomes an important factor. Speed can either be an issue from the outset, or can creep in as your dataset grows. Understanding the EXPLAIN command is essential to helping you solve and even anticipate slow queries.

Associated video: http://blip.tv/file/1791781

Statistics

Views

Total Views
49,277
Views on SlideShare
48,140
Embed Views
1,137

Actions

Likes
40
Downloads
697
Comments
6

59 Embeds 1,137

http://phpepe.com 239
http://phapalegaurav.blogspot.com 179
http://phapalegaurav.blogspot.in 171
http://learnmysql.blogspot.com 159
http://www.techiegyan.com 88
http://www.phpepe.com 53
http://www.slideshare.net 51
http://flavors.me 19
http://www.myxplain.net 13
http://phapalegaurav.blogspot.de 10
http://phapalegaurav.blogspot.com.au 10
http://phapalegaurav.blogspot.ru 10
http://paper.li 8
http://phapalegaurav.blogspot.com.es 8
https://twitter.com 8
http://feeds.feedburner.com 7
http://phapalegaurav.blogspot.nl 7
http://learnmysql.blogspot.in 7
http://phapalegaurav.blogspot.se 6
http://learnmysql.blogspot.co.uk 6
http://phapalegaurav.blogspot.co.uk 5
http://phapalegaurav.blogspot.ie 5
http://phapalegaurav.blogspot.fr 5
http://www.linkedin.com 4
http://phapalegaurav.blogspot.co.il 4
http://phapalegaurav.blogspot.ro 4
http://myxplain.net 4
http://learnmysql.blogspot.ro 3
http://iresponse.se 3
http://learnmysql.blogspot.nl 3
http://learnmysql.blogspot.se 2
http://2584047685327478499_3fe89dc5b89d726727283da989b7fe581600858e.blogspot.com 2
https://www.linkedin.com 2
http://learnmysql.blogspot.ie 2
http://phapalegaurav.blogspot.hk 2
http://a0.twimg.com 2
http://learnmysql.blogspot.jp 2
http://learnmysql.blogspot.com.au 2
http://phapalegaurav.blogspot.be 2
http://phapalegaurav.blogspot.jp 1
http://www.dbunix.com 1
http://translate.googleusercontent.com 1
http://learnmysql.blogspot.fr 1
http://learnmysql.blogspot.fi 1
http://www.slashdocs.com 1
http://plus.url.google.com 1
http://phapalegaurav.blogspot.co.at 1
http://phapalegaurav.blogspot.ch 1
http://phapalegaurav.blogspot.mx 1
http://learnmysql.blogspot.be 1
More...

Accessibility

Categories

Upload Details

Uploaded via SlideShare as Adobe PDF

Usage Rights

CC Attribution-NonCommercial-NoDerivs LicenseCC Attribution-NonCommercial-NoDerivs LicenseCC Attribution-NonCommercial-NoDerivs License

Report content

Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel

16 of 6 previous next Post a comment

  • aladinbouzerd Aladin Bouzerd Thank you! 7 months ago
    Are you sure you want to
    Your message goes here
    Processing…
  • geehock Gary Hockin As a PHPNW attendee last year, it's amazing that everywhere I look for answers PHPNW is always there!

    Gary
    1 year ago
    Are you sure you want to
    Your message goes here
    Processing…
  • danielalvarezarribas Daniel Arribas ’MySQL won’t actually execute the query, just analyse it’.

    It would be great, if it didn't. Actually, it *does* execute the query in some situations, like when subqueries are present. See http://bugs.mysql.com/bug.php?id=44802. That’s why some explain runs of slow queries take ages.
    3 years ago
    Are you sure you want to
    Your message goes here
    Processing…
  • confik Alexey Shein, Magento Developer at Blue Fountain Media Shouldn't it be ALTER TABLE ADD INDEX reg_conf_index (conference_id, registration_status); on slide 9? The order in index and in a query matters 3 years ago
    Are you sure you want to
    Your message goes here
    Processing…
  • guest4d68d4f guest4d68d4f Very useful! 4 years ago
    Are you sure you want to
    Your message goes here
    Processing…
  • phpcodemonkey Jeremy Coates, MD at Magma Digital Ltd Associated video: http://blip.tv/file/1791781 5 years ago
    Are you sure you want to
    Your message goes here
    Processing…
Post Comment
Edit your comment

Mysql Explain Explained Mysql Explain Explained Presentation Transcript