…MySQL 4.0. This even applies to Innodb tables which were already on par with general MySQL level of stability in MySQL…merging a lot these days). From my standpoint the question is when or how to use MySQL… In very many cases the problem of MySQL use is not problem of the product but problem of state …
Post: A workaround for the performance problems of TEMPTABLE views
May 19, 2010 By 7 Comments
… contents requires a temporary table and many more rows may be accessed than otherwise would had the filter been merged into the view… table such that a scan of all rows takes a second or two. mysql> show create table t2\G *************************** 1. row *************************** Table: t2 Create Table: CREATE TABLE…) When you try to restrict the second view using a filter on c1, performance is not good. MySQL is scanning the entire table…
Post: MySQL Users Conference - Innodb
May 9, 2007 By 6 Comments
…problem is table locks which are taken for statement duration for Inserts with auto-increment column. This starts giving you problems…many of them come from MySQL limits at the time when Innodb was first implemented. Many other transactional Storage Engines do not have the problems…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… expensive. If MySQL supported sort-merge or hash joins, …in a VARCHAR(36)? When tables get big, every byte matters…star schemas. The problem is that MySQL doesn’t tend …tables in a complex query with many joins. I have never seen this approach scale well. Use The Best Technologies You Can MySQL…
Post: Recovering Innodb table Corruption
July 4, 2008 By 19 Comments
…The problem is there is some buffering taking place and as MySQL crashes …table but fetch data to the script instead make sure to use LIMIT or PK Rangers when MySQL…search you can find out how many rows do you need to … block purging activity, insert buffer merge or recovery from transactional logs all…
Post: 10+ Ways to Crash or Overload MySQL
November 13, 2007 By 20 Comments
…table though complex tables can require larger sizes, so this is mainly the problem for smaller servers. Table Cache Merge Tables – Table…Merge tables for example – creating and accessing few merge tables with 1000 of subtables will likely cause your MySQL…
Post: Why MySQL could be slow with large tables ?
June 9, 2006 By 139 Comments
…when data fits in memory and when…tables, which is completely disk bound can be very slow. One of the reasons elevating this problem in MySQL…MySQL can’t do hash join or sort merge…
Post: Impact of the sort buffer size in MySQL
October 25, 2010 By 8 Comments
… it is needed. The problem with the sort buffer …when no index are available to help the sorting so I created a MyISAM table…NUMROW” -gt “$COUNT” ] do UUID=`uuidgen` mysql test -e “insert into sorttest …merge passes. For the small values of the sort buffer size, below 440KB, there are many sort merge…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…problem…mysql tables in use 1, locked 0 is number of tables used by transaction in question (meaning it was accessed) and number of tables…many inserts were done in insert buffer, how many recs were merged and how many merges did it took. Ratio of number of merges…
Post: Distributed Set Processing with Shard-Query
May 14, 2011 By 27 Comments
…conclusion, splitting a problem up into many small problems and then putting the… into the coordination node when maintaining the “materialized view” of …SQL, but right now only MySQL storage nodes are supported. …the base table: `origin_airport_id` * storage node result set merge optimization enabled:…
