… Drizzle function HTTP JSON API (experimental) Some of the Percona InnoDB patches have been merged Since Drizzle 7.0 (which was… either, they include: authentication via PAM, authentication via HTTP, various DATA_DICTIONARY tables, the Drizzle protocol plugin, authentication from a file, MySQL…
Post: Troubleshooting MySQL Memory Usage
March 21, 2012 By 3 Comments
… allocated on server and Com_stmt_send_long_data to see whenever sending long data feature is used as it can increase… TABLE_NAME: my ENGINE: InnoDB NAME: #sql516_1c42_2 TABLE_ROWS: 0 AVG_ROW_LENGTH: 0 DATA_LENGTH: 16384 INDEX_LENGTH: 0… lines below. The most likely cause for Innodb run away memory allocation is Dictionary cache though there could be other reasons too…
Comment: Connecting orphaned .ibd files
April 6, 2012 By 12 Comments
Yuri, I think a partition appears in the dictionary as a normal table, but with name st_results#P#… please file a bug here https://bugs.launchpad.net/percona-data-recovery-tool-for-innodb
Post: Limiting InnoDB Data Dictionary
February 11, 2009 By 13 Comments
… we made patch which allows to restrict memory dedicated for data dictionary. Patch was made by request of our customer Vertical Response… it from InnoDB data dictionary. So there is the trick – if you have big enough table_cache, memory consumed by data dictionary may exceed innodb_dict…
Post: How innodb_open_files affects performance
November 18, 2009 By 4 Comments
… open or closed. Furthermore besides MySQL table_cache Innodb maintains its own (called data dictionary) which keeps all tables ever accessed since table… (so it is some 200 tables/sec) – first time Innodb actually populates data dictionary. The second time we do same operation it takes… we can see even in case table it fully in Innodb data dictionary the operation is slower than MyISAM tables. Though the difference…
Post: Innodb vs MySQL index counts
November 29, 2011 By 6 Comments
… what Innodb thinks. What Innodb thinks is in the Innodb Data dictionary. The first recommendation I got was to simply use the INFORMATION_SCHEMA.INNODB_SYS… the Innodb Table monitor instead, see my next post for how that turned out, but this basically will regurgitate the entire Innodb Data dictionary…
Post: Lost innodb tables, xfs and binary grep
November 9, 2010 By 11 Comments
… slaves followed and dropped their copy of the data The important tables were all InnoDB Having a backup, customer has first attempted… run page parser, wait and see what you get. If InnoDB Data Dictionary was not overwritten by an attempt to restore from the… identify correct PK id for specific tables by just mapping data dictionary table records to index records. Instead I had to grep…
Post: How much space does empty Innodb table take ?
December 16, 2008 By 7 Comments
… tablespace for Innodb data dictionary. But that one is pretty small. This is the good reason to avoid having very small Innodb tables – they…_innodb” \G *************************** 1. row *************************** Name: test_innodb Engine: InnoDB Version: 10 Row_format: Compact Rows: 1069 Avg_row_length: 199 Data_length: 212992 Max_data… can take a lot of space in Innodb. Tables showing as using 1MB of Innodb Data can also really be taking almost 10…
Post: InnoDB TABLE/INDEX stats
March 20, 2010 By 5 Comments
… INNODB_TABLE_STATS INNODB_INDEX_STATS These table show statistics about InnoDB tables ( taken from InnoDB data dictionary). INNODB_TABLE_STATS is | table_name | table name in InnoDB… whether statistics recalculation should be done | INNODB_INDEX_STATS is | table_name | table name in InnoDB internal style (‘database/table’) | | index_name…
Post: How much memory Innodb Dictionary can take ?
May 6, 2010 By 3 Comments
… memory Innodb will require for its data dictionary depends on amount of tables you have as well as number of fields and indexes. Innodb… + 0) Threads 408536 (406936 + 1600) Dictionary memory allocated 698012720 So considering about 700M were allocated for dictionary cache in this case we… as ballpark figure. Also note Dictionary Cache is not included in “Total Memory Allocated” in SHOW INNODB STATUS any more, as that…
