… whatever limit of open files was, which is not surprising as logical operation of opening file is rather fast on local file system – one can open/close file… the same, taking 1sec (on the second time) . Whenever innodb_open_files_limit was 64 (virtually all misses ) or 16384 (all hits) performance… with innodb_open_files=16384 I got about same crash recovery speed though with no warnings. So it looks like innodb_open_files_limit=300…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
….commanual Open_filesblogpercona.commanual open_files_limitblogpercona.commanual Open_streamsblogpercona.commanual Open_table_definitionsblogpercona.commanual Open_tablesblogpercona.commanual Opened_filesblogpercona.commanual Opened_table_definitionsblogpercona.commanual Opened_tablesblogpercona…
Comment: table_cache negative scalability
April 14, 2010 By 23 Comments
…, 31014 + 27426 = 58440 os file descriptors. So – 1) Do I get errno: 24 becuase I have the open_files_limit set to 40000? 2… thread_cache_size = 100 max_connections = 400 table_cache = 20000 open_files_limit = 40000 max_binlog_size = 500M max_allowed_packet = 20M tmp…_size = 8M innodb_log_file_size = 256M innodb_log_files_in_group = 2 innodb_thread_concurrency = 16 innodb_open_files = 20000 innodb_flush_method…
Comment: table_cache negative scalability
April 14, 2010 By 23 Comments
…, 31014 + 27426 = 58440 os file descriptors. So – 1) Do I get errno: 24 becuase I have the open_files_limit set to 40000? 2… thread_cache_size = 100 max_connections = 400 table_cache = 20000 open_files_limit = 40000 max_binlog_size = 500M max_allowed_packet = 20M tmp…_size = 8M innodb_log_file_size = 256M innodb_log_files_in_group = 2 innodb_thread_concurrency = 16 innodb_open_files = 20000 innodb_flush_method…
Comment: How innodb_open_files affects performance
April 14, 2010 By 4 Comments
…/ asking about open_file_limit. One thing I see that is not talked about is how the os ulimit of “open files“, mysql setting “open_file_limit” affects the OS/MySQL and I believe is non-biased to MyISAM and InnoDB table types. If the max open_file_limit is 65535, does this mean a linux 64bit server could never have more than that opened at a given…
Comment: MySQL Server Memory Usage
September 1, 2006 By 18 Comments
…_used_connections’, ’651′ ‘Not_flushed_delayed_rows’, ’0′ ‘Open_files‘, ’95′ ‘Open_streams’, ’0′ ‘Open_tables’, ’512′ ‘Opened_tables’, ’183240′ ‘Qcache_free_blocks’, ’136′ ‘Qcache…-queries=/var/log/mysql/slow-queries.log max_connections=650 open_files_limit=6144 max_connect_errors=10000 interactive_timeout=3600 wait_timeout…
Comment: Why MySQL could be slow with large tables ?
June 21, 2006 By 139 Comments
… you will run out of file descriptors. “table_cache” is what defines how many tables will be opened and you can configure… kept open permanently which can waste a lot of memory but it is other problem. Speaking about “open_file_limit” which limits number of files MySQL… high values. I used MySQL with other 100.000 of files opened at the same time with no problems. Shutdown can be…
Comment: Database problems in MySQL/PHP Applications
November 6, 2006 By 12 Comments
… = 2000M max_allowed_packet = 32M # table_cache=20M # open-files-limit=20000 table_cache = 3072 open_files_limit = 9216 tmp_table_size=1000M sort_buffer_size…), the slave will create a master.info file, and any later # change in this file to the variables’ values below will be… #innodb_data_home_dir = /usr/local/mysql/data/ #innodb_data_file_path = ibdata1:2000M;ibdata2:10M:autoextend #innodb_log_group_home…
Comment: How fast is FLUSH TABLES WITH READ LOCK?
February 24, 2012 By 28 Comments
FLUSH TABLES WITH READ LOCK; also tries to close open files that obviously takes time too. I did not double check …/tutorials/database_management_systems/mysql/installation/mysql_tablecache_informationschema_and_open_files_limit.php says so. However, the things I do not understand…
Post: Impact of the number of idle connections in MySQL
December 17, 2010 By 20 Comments
… to work with many customers having large number of connections opened in MySQL and although I told them this was not… following Innodb settings: innodb_buffer_pool_size=1G innodb_log_file_size=64M innodb_log_buffer_size=8M innodb_flush_method… innodb_flush_log_at_trx_commit=0 max_connections = 10000 open_files_limit = 32768 The desktop is running Ubuntu 10.04, has 8GB…
