…InnoDB contain primary key columns) Buffer each pk_column value fetched from step 1, and when the buffer is full…for Innodb_buffer_pool_read_ahead which shows that the access pattern was sequential and hence InnoDB… seen by the numbers reported for the status counter Innodb_rows_read. While MySQL 5.6…
Post: A quest for the full InnoDB status
October 31, 2008 By 4 Comments
…you can have innodb-status-file option set in your my.cnf. This will make InnoDB to write the full status output into innodb_status.
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… asked me to publish a walk through SHOW INNODB STATUS output, showing what you can learn from SHOW INNODB STATUS output and how to use this info… is left by Innodb developers so SHOW INNODB STATUS can also be used as debugging tool. Next section you will find in SHOW INNODB STATUS is information… bytes/read” shows average size of read requests. For random IO these should be 16K – page size, for full table scan or…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…innodb_status_fileblogpercona.commanual innodb_strict_modeblogpercona.commanual innodb_support_xablogpercona.commanual innodb_sync_spin_loopsblogpercona.commanual innodb_table_locksblogpercona.commanual innodb_thread_concurrencyblogpercona.commanual innodb…
Post: When Does InnoDB Update Table Statistics? (And When It Can Bite)
October 6, 2011 By 5 Comments
… are documented from the MySQL and InnoDB plugin’s manual: Metadata commands like SHOW INDEX, SHOW TABLE STATUS and SHOW [FULL] TABLES (or their corresponding queries…_if_needed If you or an application constantly executes SHOW [FULL] TABLES or SHOW TABLE STATUS on many a large tables, this can affect…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
… could use an 8G write ahead log and tell innodb to do a full write of the database (basically dump memory to… modified. Q21: What’s the status of INNODB in 5.1.x? Specifically: What’s the current status of innodb_thread_concurrency ? Is it… seeing ‘thread thrashing’ (lots of threads waiting for semaphores in SHOW INNODB STATUS), you can try to disable thread throttling completely by setting…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… brands. Q37: We have a fairly large Innodb table (150GB) that is showing poor performance for full table scans. using O_DIRECT, we… KEY, then InnoDB should have placed the rows in contiguous blocks of 64 pages == 1 MB. Then a full table scan would… primary key lookups or not showed up in “show innodb statusâ€. select * from table where id=5 show innodb status: Hash table size 10624987…
Post: Understand InnoDB spin waits, win a Percona Live ticket
September 2, 2011 By Leave a Comment
… from SHOW INNODB STATUS mean? Mutex spin waits 5870888, rounds 19812448, OS waits 375285 To understand this text, you have to understand how InnoDB… to sleep right away. So, back to the output from SHOW INNODB STATUS. Here’s what it means. Mutex spin waits 5870888 is… this time, and the session schedule has two full tracks already with the full schedule to be announced very shortly now that…
Post: XtraDB: The Top 10 enhancements
August 13, 2009 By 5 Comments
… – The SHOW ENGINE INNODB STATUS command in XtraDB shows a lot more information than the standard InnoDB status (see docs). Â The built-in InnoDB status also has… entries (a full buffer provides no use) or reduce its size (see docs). Data dictionary control – Once an InnoDB table is opened…
Post: MySQL 5.5.8 - in search of stability
January 3, 2011 By 11 Comments
…-term trend, but we will see the effects anyway. The full command line to run the test is: tpcc_start localhost… from SHOW ENGINE INNODB STATUS. Here are the InnoDB settings for the initial run. Later I will change them in searching for optimal values. innodb… me show the result I got running Percona Server in optimized mode: innodb_buffer_pool_size = 26G innodb_buffer_pool_instances=1 innodb_log…
