…_malloc_low() in ut/ut0mem.c inside InnoDB source code. InnoDB wraps the majority of its memory allocations in ut_malloc_low(), so…. Apparenly OpenSUSE defaults are set in proportion to physical memory to keep the memory-hungry applications from taking the system down. On… physical memory, 2 GB swap it decided to set the virtual memory ulimit (-v) to 77.27 GB, and the physical memory (-m…
Post: How to Monitor MySQL with Percona's Nagios Plugins
February 22, 2012 By 11 Comments
… its data directory. InnoDB is getting stuck, has long-running transactions, or other problems. The pmp-check-mysql-innodb plugin checks for several indicators of severe internal problems within InnoDB, such as contention that crosses… pmp-check-unix-memory plugin checks for a single process consuming too much memory and/or for too little free memory in general…
Post: Choosing innodb_buffer_pool_size
November 3, 2007 By 39 Comments
… if you have dedicated MySQL Box and you’re only using Innodb tables you will want to give all memory you do not…_buffer, mysql threads, temporary tables, per thread sort buffer which can be allocated. There are also things like innodb additional memory pool (which… to do different VM memory adjustments. You may want to make MySQL to use Large Pages for allocating Innodb Buffer Pool and few…
Post: Different flavors of InnoDB flushing
January 13, 2011 By 9 Comments
… flushing, because that defines what MySQL InnoDB tuning should apply. The LRU list is used when InnoDB tries to read data from disk… your MySQL InnoDB tuning. Now I am about to make a strong statement: If your workload is LRU list bound, then InnoDB and MySQL… mostly defined by available memory and the I/O subsystem. Also, it seems MySQL 5.1 with the InnoDB-plugin, MySQL 5.5, and…
Post: How InnoDB handles REDO logging
February 3, 2011 By 19 Comments
… InnoDB tries to keep the working set in memory (InnoDB Buffer Pool), therefore the changes made by transactions will occur in volatile memory and later be flushed to disk. So in the event of volatile memory failure or during a system restart InnoDB can…. Both the MySQL configuration and hardware will affect the speed at which InnoDB can log. You can request that InnoDB force its REDO…
Post: Limiting InnoDB Data Dictionary
February 11, 2009 By 13 Comments
…+ tables InnoDB is consuming gigabytes of memory, keeping definition in memory all time after table was once opened. Only way to cleanup memory is…. To limit memory we introduce new variable innodb_dict_size_limit (in bytes). Some internals: There is already implemented in InnoDB LRU-based… long time and is not going to be solved by MySQL / InnoDB – contact us regarding Custom MySQL Development.
Post: Helgrinding MySQL with InnoDB for Synchronisation Errors, Fun and Profit
November 24, 2011 By 2 Comments
… on MySQL server. Let’s take a recent 5.1 bzr version (pre-5.1.61) and a single test, innodb_plugin.innodb…: innobase_start_or_create_for_mysql (srv0start.c:1514) ==9090== by 0x6B48855: innobase_init(void*) (ha_innodb.cc:2284) ==9090== by 0x712F17…, I’d consider backporting and using MySQL 5.5 atomic operation primitives with proper memory barriers, so that there is no need…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…MySQL manual…innodb_change_bufferingblogpercona.commanual innodb_checksumsblogpercona.commanual innodb_commit_concurrencyblogpercona.commanual innodb_concurrency_ticketsblogpercona.commanual innodb_data_file_pathblogpercona.commanual Innodb_data_fsyncsblogpercona.commanual innodb… shared_memory_base_…
Post: Innodb Performance Optimization Basics
November 1, 2007 By 75 Comments
… depend on the workload. Hardware If you have large Innodb database size Memory is paramount. 16G-32G is the cost efficient value… not swap out MySQL out of memory. MySQL Innodb Settings The most important ones are: innodb_buffer_pool_size 70-80% of memory is a safe…). With these basic innodb performance tunings you will be better of when majority of Innodb users which take MySQL with defaults run it…
Post: Modeling MySQL Capacity by Measuring Resource Consumptions
March 8, 2011 By 1 Comment
… our estimates. If we’re running Innodb with MySQL we can use Innodb_data_reads , Innodb_data_writes, Innodb_os_log_fsyncs for your disk… to use this information is to compare systems with different memory amount having same workload. You will often see increasing amount… 0 0 0 0 0 0 # String: # Databases # Hosts localhost # InnoDB trxID 3BBF3B55 (1/0%), 3BBF3B5A (1/0%)… 1753695 more # Last…
