… loaded by the cold test already. The buffer pool and adaptive hash index are cold for the cold test. All tests were done… believe the adaptive hash index is improving performance of InnoDB significantly during the hot run, as hash indexes are faster than a b-tree index. Also accessing…
Post: MySQL and Percona Server in LinkBench benchmark
May 8, 2013 By 18 Comments
…_locks_hash_instances=256 innodb_buffer_pool_instances=16 # MySQL 5.5 and 5.6 loose-innodb_io_capacity_max = 15000 #Percona only innodb_adaptive_hash_index_partitions=8 innodb_buffer_pool_instances=1 innodb_adaptive_flushing_method=keep_average innodb_flush_neighbor…
Post: Is your MySQL buffer pool warm? Make it sweat!
April 16, 2013 By 6 Comments
… process query traffic except for replication. The buffer pool and adaptive hash index on the standby server will not have recently accessed pages… –session-init-query command-line option, we set the option innodb_fake_changes to prevent INSERTs, UPDATEs, and DELETEs from corrupting…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… efficiency. Adaptive hash index is hash index Innodb builds for some pages to speed up row lookup replacing btree search with hash search. This section shows hash table… lock information, adaptive hash indexes and some other system structures. Pending reads and writes are pending requests on buffer pool level. Innodb may merge…
Post: Scaling problems still exist in MySQL 5.5 and Percona Server 5.5
May 20, 2011 By 11 Comments
… P.S Disabling adaptive hash index makes things a lot worse in this workload and innodb_adaptive_hash_index_partitions=16 available for partitioning adaptive hash index does not help because everything hits the same index.
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
…. Q38: Seems that adaptive hash indexes are not used for primary key lookups or not showed up in “show innodb statusâ€. select * from…) 0.00 hash searches/s, 15979.01 non-hash searches/s HT: Strange, primary key equality searches should work through the adaptive hash index! What…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… can be performed. But InnoDB‘s adaptive hash indexes require that the prefix is stored in every record R. An adaptive hash index tries to guess where… physically sorted indexes with Innodb (with index built by sort) this is when this should be helpful the most. Q3: Does Innodb secondary Indexes trees…
Post: Choosing innodb_buffer_pool_size
November 3, 2007 By 39 Comments
… data (total size of Innodb TableSpaces) because it does not only contain data pages – it also contain adaptive hash indexes, insert buffer, locks which… what Innodb is caching already. Innodb cache is more efficient compared to OS cache because there is no copying, due to adaptive hash indexes, ability…
Post: How much memory Innodb Dictionary can take ?
May 6, 2010 By 3 Comments
… SHOW INNODB STATUS look like: Total memory allocated 1101004800; in additional pool allocated 0 Internal hash tables (constant factor + variable factor) Adaptive hash index 17721976 (17701384 + 20592) Page hash 1107208 Dictionary cache 702440032 (4427312…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
… innodb_adaptive_flushingblogpercona.commanual innodb_adaptive_hash_indexblogpercona.commanual innodb_additional_mem_pool_sizeblogpercona.commanual innodb_autoextend_incrementblogpercona.commanual innodb_autoinc_lock_modeblogpercona.commanual innodb_buffer_pool_instancesblogpercona.commanual Innodb…
