… you delete a lot of scattered rows you may not see a “free space” in Innodb tablespace to grow significantly. Q6: Does Innodb… Inaam. Q19: INNODB uses it’s own internal buffer pool but it’s in conflict with the Linux kernel’s buffer pool. In… tablespace when an InnoDB instance is created. PZ: Sequential “dump” of buffer pool would need more optimizations to work – Innodb would also need…
Post: MySQL Server Variables - SQL layer or Storage Engine specific.
June 8, 2006 By 14 Comments
… replication/binlogging related options – when to delete binary logs from master. It does not affect Innodb and other storage engines transaction logs… as Innodb Buffer Pool, Key Buffer etc. It works for certain storage engines which support large pages in general. Currently MyISAM and Innodb. Some…
Post: Performance gotcha of MySQL memory tables
February 1, 2008 By 5 Comments
… 80 deletes per second while converting table to MyISAM I get about 600 deletes per second and about 4000 deletes per second for Innodb… MyISAM being significantly slower than Innodb – in this case the table is small and fully fits in Innodb Buffer Pool and log flush on transaction commit was also disabled, meaning Innodb could delay writes and…
Post: Recovering Innodb table Corruption
July 4, 2008 By 22 Comments
… Running in innodb_force_recovery mode Innodb becomes read only for data operations and so you can’t insert or delete any data (though you can create or drop Innodb tables): mysql> optimize table test; +———–+———-+———-+———————————-+ | Table… Innodb Table Corruption. In more complex cases you may need to use higher innodb_force_recovery modes to block purging activity, insert buffer…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 2 Comments
… Write Buffer is fixed size (2MB = 128 of 16KB pages) and so will not affect growth of your main Innodb Tablespace. Insert Buffer size is also restricted to half of the buffer pool size (can be changed via innodb_ibuf_max… rows. In many cases doing such processes in chunks, updating/deleting may be thousands of rows per transaction may be better…
Post: How to recover a single InnoDB table from a Full Backup
January 25, 2012 By 10 Comments
…recovery process on the backup with innodb_fast_shutdown=0 and therefore merging all the insert buffers. # innobackupex –defaults-file=/etc/my…10 | | 10008 | 52668 | 2000-03-10 | 2000-07-31 | +——–+——–+————+————+ mysql> DELETE FROM salaries WHERE emp_no=10008; The next step …
Post: Can Innodb Read-Ahead reduce read performance ?
June 26, 2007 By 2 Comments
…s Buffer pool hit rate 933 / 1000 ————– ROW OPERATIONS ————– 8 queries inside InnoDB, 3 queries in queue 12 read views open inside InnoDB Main thread process no. 3956, id 1157658976, state: sleeping Number of rows inserted 60790248, updated 11571576, deleted 0, …
Post: My Innodb Feature wishes
May 4, 2006 By 30 Comments
… buffer for delete. For Insert operation Innodb uses nice tecnique called Insert Buffer which speeds up inserts for non-unique indexes a lot. However deletes… (expecially together with ability to create index without table rebuilding) Buffer pool improvements. I would like to see couple of things… per tablespace would be great. This will complicate buffer management a bit but Innodb is already to deal with 2 page sizes…
Comment: Database problems in MySQL/PHP Applications
November 6, 2006 By 13 Comments
… the master.info file, unless you shutdown # the slave server, delete master.info and restart the slaver server. # For that reason… .._buffer_pool_size up to 50 – 80 % # of RAM but beware of setting memory usage too high innodb_buffer_pool_size = 8000M #innodb_additional_mem_pool_size = 80M # Set .._log_file_size to 25 % of buffer pool size innodb_log…
Comment: How to calculate a good InnoDB log file size
June 1, 2010 By 38 Comments
…innodb_buffer_pool_size = 2048M innodb_additional_mem_pool_size = 20M innodb_log_file_size = 512M innodb_log_files_in_group = 2 innodb_log_buffer_size = 8M innodb…
