… is a lot larger problems with MySQL 5.5 with addition of user variables, stored procedures, prepared statements etc which can be a memory hog. My intent with this post is dual. I would encourage MySQL Team at… at how it uses MySQL to identify potential causes. Is it working with large blobs ? Using user variables ? Prepared Statements ? memory tables ? In…
Post: MySQL Prepared Statements
August 2, 2006 By 19 Comments
… and client. So in MySQL 4.1 Prepared statement came. Do not mix these native Server Side Prepared Statements with emulated prepared statements which JDBC, ODBC and… MySQL Prepared statements – many of the problems such as extra round trip, non working query cache or non working prepared statements for some of the statements…
Post: MySQL Query Cache and prepared statements - support comming ?
March 15, 2007 By Leave a Comment
… with prepared statements in MySQL 5.1 The interesting thing Konstantin notes it just took few days to fix it – I believe MySQL Support… help MySQL getting even better results in SpecJAppServer benchmarks as previously it was hard choice – if you want to have fast prepared statements…
Post: DBD::mysql 4.014 breaks pt-table-checksum 2.0
February 21, 2012 By Leave a Comment
… in DBD::mysql. This bug affects pt-table-checksum 2.0 but not 1.0 because the newer version uses prepared statements with parameter values, whereas the older version does not. It seems, although I have not verified this, that DBD::mysql 4.014 has some sort of caching mechanism which causes it to use the wrong prepared statement.
Post: 10+ Ways to Crash or Overload MySQL
November 13, 2007 By 20 Comments
… consumed by single prepared statement you can create statement with thousands of placeholders and send data for each of them using mysql_stmt_send_long_data call – Server buffers such data until you have executed prepared statement. Innodb Table Cache…
Post: Wishes for new "Pure PHP" MySQL driver
October 28, 2006 By 17 Comments
… of statements which can’t be prepared – I would like library to take care of emulating these for me. Arrays in Prepared Statements Dealing with certain types of queries, ie queries with IN is so painful with prepared statements – I would like… like to be able to run multiple queries for multiple MySQL connections at once. For scale out applications data to generate…
Post: MySQL Query Cache
July 27, 2006 By 69 Comments
… great feature called “Query Cache” which is quite helpful for MySQL Performance optimization tasks but there are number of things you… not support prepared statements and cursors Query Cache works with query text and want full result set at once. In prepared statements there is…_hits/Qcache_inserts Other portion of overhead comes from modification statements which you can calculate by (Com_insert+Com_delete+Com…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…constantly referring to the amazing MySQL manual, especially the option and variable reference table. But… port_open_timeoutblogpercona.commanual preload_buffer_sizeblogpercona.commanual Prepared_stmt_countblogpercona.commanual print_defaultsblogpercona.commanual profilingblogpercona.commanual …
Post: New SpecJAppServer results at MySQL and Sun.
November 12, 2008 By Leave a Comment
… can also see Server prepared statements were disabled for the run (same as we had few years ago). Prepared statements generally should have helped this benchmark because it has a lot of same queries an Prepared Statements can be more… it better to disable them. The MySQL Settings are probably what is the most interesting: MySQL 5.0 Tuning in /etc/my…
Post: Top 5 Wishes for MySQL
June 29, 2007 By 10 Comments
… saying about Prepared Statements in MySQL 4.1 which came without query cache support but even worse not all of statements could be prepared not to mention other issues. I’m saying about SubSelects which were added in MySQL 4.1… long time. For example Query Cache support for Prepared Statements is only fixed in MySQL 5.1 and Most of other items are…
