… caused your system tablespace size to explode – they will shrink to the normal size and all what you have …Percona Server the following can be helpful: mysql> select * from innodb_rseg; +———+———-+———-+———+————+———–+ | rseg_id | space_id | zip_size | page_no | …
Comment: MySQL File System Fragmentation Benchmarks
October 10, 2008 By 28 Comments
… dangerous ! Because there is a “bug” in MySQL InnoDB which don’t shrink the file ibdata1 after a DROP Database without dropping the Table – If you have the defalut setting and not innodb…://crazytoon.com/2007/04/03/mysql-ibdata-files-do-not-shrink-on-database-deletion-innodb/ best regards gregor
Post: MySQL-Memcached or NOSQL Tokyo Tyrant - part 1
October 15, 2009 By 16 Comments
… all database sizes tend to always grow and very rarely shrink. Which leads to a challenge faced by almost everyone… all database sizes tend to always grow and very rarely shrink. Which leads to a challenge faced by almost everyone how… of 1GB, 2GB, and 4GB. For these tests I left Innodb with a 256M buffer pool, or roughly with 9% of…
Post: Troubleshooting MySQL Memory Usage
March 21, 2012 By 5 Comments
… connections (or stopping related applications) and observing whenever memory usage shrinks can be very helpful in diagnostics. If you have many… *************************** SESSION_ID: 7234 TABLE_SCHEMA: test TABLE_NAME: my ENGINE: InnoDB NAME: #sql516_1c42_2 TABLE_ROWS: 0 AVG_ROW_LENGTH… *************************** SESSION_ID: 7231 TABLE_SCHEMA: test TABLE_NAME: z ENGINE: InnoDB NAME: #sql516_1c3f_0 TABLE_ROWS: 0 AVG_ROW_LENGTH…
Post: High-Performance Click Analysis with MySQL
December 22, 2008 By 13 Comments
… to my next point: Use InnoDB Assuming that you will use the stock MySQL server, InnoDB is usually your best bet. (Actually… capacity. What does this have to do with InnoDB? Data clustering. InnoDB‘s primary keys define the physical order rows are… there are indexes other than the primary key, we can shrink the primary key’s width: create table ads_by_day…
Post: 10+ Ways to Crash or Overload MySQL
November 13, 2007 By 20 Comments
… statement. Innodb Table Cache Leak – Innodb never shrinks its internal table cache (data dictionary) so by creating and accessing large amount of Innodb tables… also use similar technique with innodb_file_per_table. However you can’t control growth of Innodb system tablespace which is used…
Comment: Choosing innodb_buffer_pool_size
January 20, 2011 By 39 Comments
… used for the mysql-system-tables(small-sized). the production-innodb-database allocates now of about 50GB of filesystem-space, the dump is about 19GB big. i know that innodb – ibdata – files will never shrink, so i have to drop and import the… learned(thanx to your blog!) i definitely want to increase innodb_puffer_pool_size(which is set to just 386MB). my…
Post: MySQL Blob Compression performance benefits
January 11, 2008 By 17 Comments
… with true data size and performance gains, especially for Innodb tables. With Innodb tables BLOB gets its own page (allocated outside of… think about how many rows you will be able to shrink down so they fit back to the page or at…
Comment: Learning about MySQL Table Fragmentation
August 21, 2009 By 20 Comments
Yes. This is the option you configure in my.cnf Note however you will need to recreate tables to start using it. And you main tablespace ibdata1 will never shrink – typically you would reload database when you start using innodb_file_per_table.
