… query. (See part two for handling massive slow log volume.) The slow logs are served, via HTTP, by… will need version 0.6 or later to get these features. Be aware that playback output is…-line option, we set the option innodb_fake_changes to prevent INSERTs, UPDATEs, and DELETEs from corrupting the…
Post: Some little known facts about Innodb Insert Buffer
January 13, 2009 By 12 Comments
…insert buffer the merge is performed before page is made available. This means insert buffer can slow down read operations. The other way insert…Innodb Insert Merge Buffer are available in SHOW INNODB STATUS output: ————————————- INSERT…
Post: InnoDB: look after fragmentation
November 5, 2009 By 12 Comments
…: 38530 InnoDB_IO_r_bytes: 631275520 InnoDB_IO_r_wait: 0.204893 # InnoDB_rec_lock_wait: 0.000000 InnoDB_queue_wait: 0.000000 # InnoDB_pages… happens now with Q2 ? yes, it’s getting slow now, as we made key “block_id” inserted not in order. +—————————+ | count(distinct username…
Comment: Why MySQL could be slow with large tables ?
October 17, 2011 By 141 Comments
… SELECT and inserts get slowed . I have the below solutions in mind : 1. Move to innodb engine ( but i fear my selects would get slowed , as…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… will be free already. OS Waits are relatively slow, and if you get tens of thousands of OS waits per second it… sec, process no 3946, OS thread id 1151088992 inserting, thread declared inside InnoDB 500 mysql tables in use 1, locked 1 3… of merges to number of inserts is pretty much insert buffer efficiency. Adaptive hash index is hash index Innodb builds for some pages…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… when self tuning gets it wrong. Q10: When Innodb decides to schedule sequential read-ahead, random read ahead ? HT: InnoDB schedules a sequential… which slows down throughput. If we could control the checkpointing rate we could use an 8G write ahead log and tell innodb… possible to get the same benefit if you’re performing INSERT with multiple values? We build up INSERTS on our clients and insert values…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 2 Comments
…Innodb Tablespace. Insert Buffer size is also restricted to half of the buffer pool size (can be changed via innodb…and which is the most likely cause of getting extremely large system tablespace) The records can … you can use innodb_max_purge_lag to make a threads doing modifications slow down if …
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
…or can a bit slow it down. Plus there were bunch of micro optimizations in Innodb in 5.0 …that cause data corruption, crashes, or wrong query results get the highest priority. We are slowly working on…! If you have inserted in an ascending order of the PRIMARY KEY, then InnoDB should have placed the …
Post: Thinking about running OPTIMIZE on your Innodb Table ? Stop!
December 9, 2010 By 18 Comments
… sort instead of via insertion. This process can be a lot faster, especially for large indexes which would get inserts in very random… fill factor. The problem is…. OPTIMIZE TABLE for Innodb tables does not get advantage of it for whatever reason. Lets take a… level commands or tools (like mysqldump) do not get advantage of it and will use old slow method of building indexes by insertion.
Post: The perils of InnoDB with Debian and startup scripts
January 28, 2009 By 13 Comments
…’s pretty easy to get into a “perfect storm”…which would be extremely slow on this machine,… | 6318 | user | Sending data | insert into tableB… | 6322 | user | update | insert into | 6327 | user | | NULL |… SHOW INNODB STATUS: ===================================== 090128 8:29:03 INNODB MONITOR OUTPUT…
