… our primary key. After identifying the Primary Key don’t forget to remove the innodb_… normally the primary key will be larger on disk because it stores also … Skipped: 0 Warnings: 0 mysql (employees) > select * from salaries where emp_no=10008; +——–+——–+————+————+ | emp_…
Post: Flexviews - part 3 - improving query performance using materialized views
April 4, 2011 By 12 Comments
…, Flexviews includes a MySQL stored procedure API, called the SQL_API which is used to define the view. These stored procedures maintain the… used by the above view, as stored in the data dictionary: mysql> select * from flexviews.mview_table where mview_id= flexviews.get_id…. In cases where this is not useful, simply ignore this column. It is used to prevent wide innodb primary keys on the MV. mysql> select…
Post: Should we give a MySQL Query Cache a second chance ?
April 10, 2011 By 63 Comments
…as MySQL 5.5 uses for Innodb Buffer Pool and have multiple MySQL …diagnosing the application, such as where this query comes from …MySQL have very large number of queries doing updates through primary key and use primary key… Query Cache Storage Engines MySQL Query Cache now stores queries in local…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 17 Comments
…Innodb secondary Indexes trees are allocated in two extents same as primary key tree or stored in the same extent ? HT: An InnoDB…in MySQL 5.1 Q15: How frequently does Innodb fuzzy checkpointing is activated HT: InnoDB…where it would be useful to have a foreign key not reference an entire primary key …
Post: InnoDB vs MyISAM vs Falcon benchmarks - part 1
January 8, 2007 By 117 Comments
…MySQL version We used MySQL 5.1.14-beta sources for MyISAM / InnoDB and MySQL 5.1.14-falcon bitkeeper tree bk://mysql.bkbits.net/mysql…primary key. InnoDB is faster than MyISAM by 6-9%. Falcon shows very bad scalabilty. READ_KEY_POINT Query: SELECT name FROM $tableName WHERE…
Post: Connecting orphaned .ibd files
May 13, 2011 By 12 Comments
…, PRIMARY KEY (`TABLE_ID`,`ID`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 Please note field SPACE. For table actor it is equal to 15: mysql> select…. As you can see secondary indexes are stored in actor.ibd as well. But where is space_id in actor.ibd? Like… CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (actor_id), KEY idx_actor_last_name (last_name) )ENGINE=InnoDB DEFAULT CHARSET=utf8; This command…
Post: Shard-Query EC2 images available
May 11, 2011 By 2 Comments
…PRIMARY KEY (`date_id`), KEY `FlightDate` (`FlightDate`), KEY `Year` (`Year`,`Quarter`,`Month`,`DayOfWeek`), KEY `Quarter` (`Quarter`,`Month`,`DayOfWeek`), KEY `Month` (`Month`,`DayOfWeek`), KEY `DayOfWeek` (`DayOfWeek`) ) ENGINE=InnoDB…
Post: MySQL-Memcached or NOSQL Tokyo Tyrant - part 1
October 15, 2009 By 16 Comments
…based on an integer based primary key B.) Update data from that row and replace the stored contents on disk C…, 2GB, and 4GB. For these tests I left Innodb with a 256M buffer pool, or roughly with 9… of writes in MySQL coupled with the still large # of reads takes its toll. Another place where I have …
Post: Recovering Innodb table Corruption
July 4, 2008 By 19 Comments
… with >= MySQL-4.1.1 and stored already) 6353 InnoDB: Page may be an index page where index id is 0 25556 InnoDB: (index “PRIMARY” of… NOT NULL AUTO_INCREMENT, -> PRIMARY KEY (`id`) -> ) ENGINE=MYISAM; Query OK, 0 rows affected (0.03 sec) mysql> insert into test2 select * from…
Post: Heikki Tuuri answers to Innodb questions, Part II
November 4, 2007 By 13 Comments
…writes to about 6 tables, what version of Innodb/MySQL would you recommend? I’ve been staying … using solid state disks for storing ib_log* files; I know that innodb writes files in the …for primary key lookups or not showed up in “show innodb statusâ€. select * from table where id=5 show innodb …
