…but there are limitations which MyISAM imposes…mysql socket=/var/lib/mysql/mysql.sock user=justin innodb_buffer_pool_size=64G innodb_log_file_size=4G innodb_file_per_table…file_format=barracuda innodb_log_buffer_size=32M innodb_buffer_pool_instances=16 metadata_locks_hash_instances=32 table_open_cache…
Post: More on MySQL transaction descriptors optimization
April 26, 2013 By Leave a Comment
… optimization in MySQL 5.6 virtually eliminates contention on the mutex protecting the list of transactions, its applicability is quite limited. Namely… innodb_file_per_table = true innodb_read_io_threads = 8 innodb_write_io_threads = 8 innodb_io_capacity = 2000 max_connections=5000 table_open_cache…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…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…
Post: How innodb_open_files affects performance
November 18, 2009 By 4 Comments
…keep open file descriptor when table is open – open table is purely logical state and appropriate .ibd file may be open or closed. Furthermore besides MySQL table_cache Innodb…_open_files=16384 I got about same crash recovery speed though with no warnings. So it looks like innodb_open_files_limit…
Post: MySQL 5.5 and MySQL 5.6 default variable values differences
February 21, 2013 By 8 Comments
…among variables values. I do not expect large impact here. table_open_cache is increased from 400 to 2000 by default. Good change… considering open_files_limit was also raised. Unlikely to cause significant gains unless opening and closing files is expensive operation (such as using MySQL on NFS file…
Post: Review of MySQL 5.6 Defaults Changes
October 8, 2012 By 10 Comments
… which would mean limit disabled. Very few users actually need DOS prevention this variable strives to provide as MySQL is typically protected by Firewall to begin with. open_files_limit = 5000 strangely enough this is where… 5000 tables. There is also little “savings” in keeping this value low – 64K or even more would be good default. query_cache…
Post: MySQL opening .frm even when table is in table definition cache
November 21, 2011 By 8 Comments
… MySQL with 100 tables and the table_definition_cache set to 1000. My understanding of this is that MySQL won’t revert to opening the FRM files to read the table… it is. We can ignore the upper limit on number of storage engines for MySQL and understanding the relationship between the range…
Comment: New Forum Categories: Help Wanted, For Hire
March 5, 2013 By 1 Comment
…lower_case_table_names=1 general_log = ON max_heap_table_size=128M event_scheduler=ON query_cache_limit = 10M open_files_limit = 8088 …_file_size = 512M innodb_open_files=2048 #Replication-skip replicate-ignore-table=mysql.gsd_runs replicate-ignore-table=mysql.gsd_monitor ======== ==> max_heap_table_…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
…clients | 205174 | | Aborted_connects | 29 | | Binlog_cache_disk_use | 0 | | Binlog_cache_use | 9630066 | | Bytes_received | … there are InnoDB tables whose .frm files exist but have…output. The stock MySQL server’s limitation of one-… knowing openings in chess — the great chess players study openings…
Comment: MySQL Server Memory Usage
September 1, 2006 By 21 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_free_memory…=/db/disk2/mysql/data log-bin=/var/log/mysql/log log-slow-queries=/var/log/mysql/slow-queries.log max_connections=650 open_files_limit=6144… used. sort_buffer_size=2M query_cache_size=10M # Might be increased thread_cache_size=40 table_cache=512 # Default 64 was used before…
