…Com_stmt_send_long_data to see whenever sending long data feature is …Internal hash tables (constant factor + variable factor) Adaptive hash index 4422068288 (2039977928 + 2382090360) Page hash 127499384 Dictionary… likely cause for Innodb run away memory allocation is Dictionary cache though there …
Post: Limiting InnoDB Data Dictionary
February 11, 2009 By 13 Comments
… memory we introduce new variable innodb_dict_size_limit (in bytes). Some internals: There is already implemented in InnoDB LRU-based algorithm to… 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: The Doom of Multiple Storage Engines
May 8, 2010 By 22 Comments
… – you can for example get .frm out of sync with internal data dictionary if you crash at wrong time. Transaction Support We have… handle Innodb specifics well. We could get rid of SQL level table locks and using Innodb internal data dictionary instead of Innodb files. We would use Innodb…
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… memory stats from SHOW INNODB STATUS look like: Total memory allocated 1101004800; in additional pool allocated 0 Internal hash tables (constant factor…
Post: Lost innodb tables, xfs and binary grep
November 9, 2010 By 11 Comments
… 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… needed a way to find pages that match it. InnoDB would internally store integers in 4-bytes rather than 10 bytes if…
Post: The perils of InnoDB with Debian and startup scripts
January 28, 2009 By 13 Comments
… they have a lot of tables, InnoDB uses over 3.5G of memory for its data dictionary (the subject for another post — we… of memory less to play with, solely due to the data dictionary. But this strategy will only reduce physical reads if the… as the other queries; it’s just touching the same internal structures. So a user working on table A can interfere…
Post: Recovering CREATE TABLE statement from .frm file
December 17, 2008 By 4 Comments
… test/test_innodb from the internal data dictionary of InnoDB though the .frm file for the table exists. Maybe you have deleted and recreated InnoDB data files… sure Innodb has something in its data dictionary so it allows MySQL to succeed displaying .frm file contents: mysql> create table test_innodb(i…
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 internal…| | modified | internal counter to judge whether statistics recalculation should be done | INNODB_INDEX_STATS is | table_name | table name in InnoDB internal style (‘database…
Post: XtraDB storage engine release 1.0.3-6
July 20, 2009 By 6 Comments
…-style-io-thread Google’s fixes to InnoDB IO threads dict-size-limit Limit of internal data dictionary Fixed bugs: MySQL Bugs: #39793: Foreign…: “main.innodb_xtradb_bug317074 internal check fails on 5.1.36†Bug #395778 in Percona-XtraDB: “main.innodb-analyze internal check failed…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 1 Comment
… in main tablespace – these are system tables, also known as data dictionary – table and index definitions and related stuff, double write buffer… it internally commits every 10000 rows. Running Very Long Transaction If you’re running very long transaction, be it even SELECT, Innodb…
