… performance. Solution for this problem was to use set optimizer_search_depth=0, rarely used option which as per manual will chose… picks value of min(number of tables, 7) essentially limiting search depth to no more than 7 at which complexity is reasonable… many tables as optimizer heuristics are improved so much higher search depths are feasible now.
Comment: Joining many tables in MySQL - optimizer_search_depth
April 23, 2012 By 8 Comments
… experiments to determine what is a reasonable limit for the search depth (and the total number of tables) that can be optimized… go arbitrarily bad, that’s why the choice of higher search depth was left to the user who knows what they are…, the server should analyze the query and should determine the search depth based on some syntactic properties and knowledge of indexes. The…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…_definitionsblogpercona.commanual Opened_tablesblogpercona.commanual optimizer_prune_levelblogpercona.commanual optimizer_search_depthblogpercona.commanual optimizer_switchblogpercona.commanual partitionblogpercona.commanual performance_schemablogpercona.commanual…
Comment: Joining many tables in MySQL - optimizer_search_depth
April 23, 2012 By 8 Comments
… of my blog post is what default value of optimizer_search_depth is impractical as 62! which is potential number of combinations…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… has 4091 buffer(s) 2208.17 hash searches/s, 175.05 non-hash searches/s This section shows insert buffer and adaptive… some pages to speed up row lookup replacing btree search with hash search. This section shows hash table size, number of used…. Note: our book has an updated, more complete, more in-depth explanation of SHOW INNODB OUTPUT.
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… readahead. PZ: Would be interesting to play with read-ahead depth here. These settings mean there can be quite significant stall…(s) 0.00 hash searches/s, 15979.01 non-hash searches/s HT: Strange, primary key equality searches should work through the adaptive…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… a lot of customers who do click analysis, site analytics, search engine marketing, online advertising, user behavior analysis, and many similar… easy and familiar for me to use the example of search engine marketing. I’ll do that throughout this article. Requirements… Infobright. While I have not evaluated their technology in depth, I think it merits a good look. I had…
Post: Percona Welcomes MySQL 5.6!
February 25, 2013 By Leave a Comment
… before that – for example, work on the Innodb Full Text Search project was started over 6 years ago, in addition with… advantage of MySQL 5.6′s features; create an in-depth upgrade plan; help design and deploy new applications to bring…
Post: An update on Percona Live MySQL Conference & Expo 2012
November 30, 2011 By 2 Comments
… assumption explicit: we need full coverage of the breadth and depth of topics, not just the mad scientist topics. So, please…, security, using MySQL with NoSQL, geospatial functionality, cloud computing, Cluster, search, sharding, memcached, high availability, DevOps, Big Data, SSD storage, data…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
… lot of the same components. Tagging, friends, queues, click tracking, search, paginated displays — we’ve seen these and dozens of other…’s guidance is our first rule. The customer determines the depth and complexity of the analysis we do. A lot of…
