… with Innodb crash recovery on box with large amount of memory (64GB) with Innodb Buffer pool configured to be just a bit over 20GB. Innodb recovery was taking long hours with reasonably sized Innodb log files… one CPU 100% busy. I took oprofile to see what exactly CPU is being spent for and saw the following picture: samples…
Post: What is stored InnoDB buffer pool
September 28, 2008 By 8 Comments
Ever wonder what is stored in InnoDB buffer pool at the moment ? It is not so hard actually – we made a short patch for MySQL 5.0 which show innodb buffer pool content mysql> select * from information_schema.INNODB_BUFFER_POOL_CONTENT; +———–+——-+——–+———+———-+————+———–+————–+————–+—————-+—————–+————–+——————+ | BLOCK_NUM…
Post: XtraDB feature: save / restore buffer pool
January 20, 2010 By 20 Comments
… in announcement, the release-making feature is ability to save and restore InnoDB buffer pool. The idea is not new and was originally developed by… of buffer pool ? There are several reasons. First, it’s not rate on modern servers to have 32GB+ of RAM, with allocated InnoDB buffer_pool… see what results we have. Details about patch you can get there http://www.percona.com/docs/wiki/percona-xtradb:patch:innodb…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…buffer pool. Finally you can see buffer pool hit ratio which measures buffer pool efficiency. 1000/1000 corresponds to 100% hit rate. It is hard to tell what buffer pool…
Post: The relationship between Innodb Log checkpointing and dirty Buffer pool pages
February 17, 2012 By 10 Comments
…, and that (in this case) is a very small percentage of the total buffer pool. A page in Innodb contains rows, indexes, etc., while… that are not flushed. This, in essence, is what fuzzy checkpointing is. The checkpoint process is really a logical operation. It occasionally (as chunks…
Post: InnoDB memory allocation, ulimit, and OpenSUSE
August 23, 2010 By 7 Comments
… not worry about it. What shall we call that friend? It is used for storing some meta information about buffer pool pages. The most… is the blocks array. Thus we can see that we are allocating another chunk that is in proportion to the setting of innodb_buffer_pool… proper innodb_buffer_pool_size estimations when the system has a lot of RAM and you want to have the largest possible innodb_buffer_pool_size…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
… server is: set innodb_flush_method=O_DIRECT in my.cnf, to prevent double buffering. Configure as much memory as possible to InnoDB‘s buffer pool… the post on this this matter the other day – choosing innodb_buffer_pool_size Q36: There have been several MySQL bugs opened about… work through the adaptive hash index! What is your database like? Do you have a big enough buffer pool? PZ: I guess it may…
Post: Different flavors of InnoDB flushing
January 13, 2011 By 9 Comments
… you can’t really detect what kind of flushing is used. There is a variable in SHOW STATUS, innodb_buffer_pool_pages_flushed, but it shows… STATUS variable innodb_buffer_pool_pages_LRU_flushed, which shows only pages flushed by the LRU list. So, let’s see what flushing we have using 13GB and 52GB for innodb_buffer_pool_size settings in Percona Server 5…
Post: What to tune in MySQL Server after installation
September 29, 2006 By 118 Comments
… or be involved with MySQL Performance in some way is to ask them what should be tuned in MySQL Server straight after… disk. innodb_buffer_pool_size This is very important variable to tune if you’re using Innodb tables. Innodb tables are much more sensitive to buffer size… it is not going to grow dramatically do not oversize innodb_buffer_pool_size you might find better use for memory available. innodb_additional_mem_pool…
Post: Is there room for more MySQL IO Optimization?
January 3, 2013 By 11 Comments
… with 6GB allocated for innodb_buffer_pool which with other memory needs leaves roughly 1GB for OS Cache. Here is pt-summary snippet: # Percona… sec) The table is approximately 30GB in size including indexes which is way more than buffer pool size and OS cache which is available. I… it remained much better in buffered mode. Take a look at the graph: What this tells me is there is a lot of untapped…
