… so it would not swap out MySQL out of memory. MySQL Innodb Settings The most important ones are: innodb_buffer_pool_size 70-80… here or read one of our MySQL Presentations. Application tuning for Innodb Especially when coming from MyISAM background there would be some changes…). With these basic innodb performance tunings you will be better of when majority of Innodb users which take MySQL with defaults run it…
Post: Fix of InnoDB/XtraDB scalability of rollback segment
January 18, 2009 By 9 Comments
…. For reference MySQL parameters: [mysqld] #mysqld options in alphabetical order user=root default_table_type=MYISAM innodb_buffer_pool_size=6G innodb_data_file… auto –mysql-host localhost –mysql-port 3306 –mysql-socket /data/vadim/benchwork/var/mysql_benchwork.sock –mysql-user user –mysql-password –mysql-db sbtest –mysql-table-engine innodb –myisam-max…
Post: How to recover a single InnoDB table from a Full Backup
January 25, 2012 By 10 Comments
… easy with MyISAM but if your tables are InnoDB the process is a little bit different story. With Oracle’s stock MySQL you… all the InnoDB data we are going to recover only the “salaries” table: Discard the tablespace of the salaries table: mysql> set…: As we learned , you can also recover single InnoDB table as with MyISAM but knowing in advance that there are some prerequisites…
Post: MySQL 5.5 and MySQL 5.6 default variable values differences
February 21, 2013 By 8 Comments
… | | INNODB_PURGE_BATCH_SIZE | 20 | 300 | | PERFORMANCE_SCHEMA_MAX_THREAD_INSTANCES | 1000 | 224 | | SOCKET | /tmp/mysql_sandbox5530.sock | /tmp/mysql_sandbox5610.sock | | INNODB_FILE… Innodb table but getting MyISAM because Innodb was disabled for some reason was very error prone gotcha. Note this is as far as MySQL…
Post: Is there room for more MySQL IO Optimization?
January 3, 2013 By 11 Comments
…files, binary log, FRM files, MySQL MyISAM system tables etc. Starting MySQL 5.5 MySQL uses asynchronous IO …Innodb_data_reads | 54561 | | Innodb_data_reads | 38277 | | Innodb_data_reads | 25895 | | Innodb_data_reads | 31363 | | Innodb_data_reads | 170816 | | Innodb_data_reads | 207432 | | Innodb…
Post: How FLUSH TABLES WITH READ LOCK works with Innodb Tables
March 23, 2012 By 20 Comments
…: mysql> show processlist; +——-+——+———–+———-+———+——+————————-+—————————–+———–+—————+———–+ | Id | User | …Innodb tables and you’re not actively changing users, stored procedures etc (which are stored in MyISAM…
Post: Troubleshooting MySQL Upgrade Performance Regressions
February 15, 2012 By Leave a Comment
… MySQL Version to get slower plan instead of new one getting faster. Check stats sampling settings such as innodb-stats-method and myisam-stats-method. For Innodb storage engines it is possible for stats… disabling innodb_stats_on_metadata and increasing innodb-stats-sample-pages to get more accurate results. In recent Percona Server versions and MySQL…
Post: MySQL Indexing Best Practices: Webinar Questions Followup
August 16, 2012 By 4 Comments
… Innodb Table id2 is not needed pas part of second key as PRIMARY key is appended to it internally anyway. For MyISAM… key significantly fragmented. I also would note there are some MySQL optimizer restrictions in how well it can deal with primary… index for “order by desc” indicates a double linked list. Innodb has double linked list – each leaf page contains pointers to…
Post: Two Types of MySQL Users
May 10, 2010 By 5 Comments
… and write them, they may even hack on MySQL. So this fraction of MySQL Community looks a lot larger than it is… this – you might think most relevant players in MySQL community participated in MySQL Users Conference over the years. This is about 2000… you can copy MyISAM tables on file basics but not Innodb ? By the fact you can have transactions with MyISAM tables but they…
Post: When would you use SAN with MySQL ?
March 9, 2009 By 18 Comments
… managing a lot of relatively small MySQL installations or managed hosting provider. For large MySQL web MySQL installations using Sharding or replication IO… are very latency critical. Now what is about MySQL/Innodb specifics ? First, in MySQL if you’re looking for durable transactions the log… queries executed having only one IO at the time if Innodb or MyISAM tables are used. There is read-ahead functionality but…
