… log every query. (See part two for handling massive slow log volume.) The slow logs are served, via HTTP, by mysql_slowlogd…-query command-line option, we set the option innodb_fake_changes to prevent INSERTs, UPDATEs, and DELETEs from corrupting the data on the standby server. You will need Percona Server in order to use innodb…
Post: InnoDB: look after fragmentation
November 5, 2009 By 12 Comments
…query that scans data by primary key was slow. How slow ? Let me show. The query in …inserted not in order. +—————————+ | count(distinct username) | +—————————+ | 5903053 | +—————————+ 1 row in set (2 min 8.92 sec) mysql> SHOW STATUS LIKE ‘Innodb…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… time object will be free already. OS Waits are relatively slow, and if you get tens of thousands of OS waits… sec, process no 3946, OS thread id 1151088992 inserting, thread declared inside InnoDB 500 mysql tables in use 1, locked 1 3… of merges to number of inserts is pretty much insert buffer efficiency. Adaptive hash index is hash index Innodb builds for some pages…
Post: Some little known facts about Innodb Insert Buffer
January 13, 2009 By 12 Comments
…insert buffer the merge is performed before page is made available. This means insert buffer can slow down read operations. The other way insert…. Stats about Innodb Insert Merge Buffer are available in SHOW INNODB STATUS output: ————————————- INSERT BUFFER AND ADAPTIVE …
Post: Improved InnoDB fast index creation
November 6, 2011 By 4 Comments
…_INCREMENT PRIMARY KEY, c FLOAT) ENGINE=InnoDB; Query OK, 0 rows affected (0.00 sec) mysql> INSERT INTO t(c) VALUES (RAND… to tmp table” part will not be affected by a slow tmpdir, but rebuilding the indexes will obviously take longer. Another… TABLE OPTIMIZE TABLE is mapped to ALTER TABLE … ENGINE=InnoDB for InnoDB tables and thus, is just a special case of the…
Post: Innodb Recovery Update - The tricks what failed.
May 24, 2007 By 3 Comments
… Innodb avoid touching it. Even when we dropped all Innodb tables (for test purposes) Innodb still was crashing if we attempted to enable insert buffer. I think it would be nice for Innodb… reason. In fact dump and reload process can be so slow restoring even week old backup and running roll forward recovery…
Post: My Innodb Feature wishes
May 4, 2006 By 30 Comments
… times space compression. Insert buffer for delete. For Insert operation Innodb uses nice tecnique called Insert Buffer which speeds up inserts for non-unique indexes… times+ slower, which is especially bad for rollback of failed inserts which may take too long to complete Index build by… many blobs in the same row is going to be slow. For medium sized blobs it would be much better to…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 2 Comments
… your main Innodb Tablespace. Insert Buffer size is also restricted to half of the buffer pool size (can be changed via innodb_ibuf… need. If you’re looking at SHOW INNODB STATUS this is how you can see Insert Buffer Size: Ibuf: size 108931, free… this problem first you can use innodb_max_purge_lag to make a threads doing modifications slow down if purge thread can…
Post: Detailed review of Tokutek storage engine
April 28, 2009 By 21 Comments
… number of inserts/sec is almost linear even when table size bigger than available memory. For the last 10M rows inserted, InnoDB averaged… binary form and mysqld binary does not contain InnoDB. Tokutek tells me that InnoDB will be included in a future release. With… the problem of random IO, waste of RAM memory and slow inserts. This is where I think Tokutek appears to be positioned…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… may not see a “free space” in Innodb tablespace to grow significantly. Q6: Does Innodb policy replacement algorithm takes into account page… which slows down throughput. If we could control the checkpointing rate we could use an 8G write ahead log and tell innodb… benefit if you’re performing INSERT with multiple values? We build up INSERTS on our clients and insert values 50 or so at…
