… SEQUENTIAL inserts into Primary Key, that this is quite suitable for InnoDB, and in it we have random inserts into SECONDARY KEYS (k), which…) ON DUPLICATE KEY UPDATE k=VALUES(k)+k; COMMIT; That is, our PRIMARY KEY is not sequential anymore, which is bad for InnoDB, but… –rand-type=pareto run and InnoDB options are: [mysqld_safe] numa-interleave malloc-lib=/usr/local/Percona-Server-5.5.30-rel30…
Post: Is Synchronous Replication right for your app?
May 14, 2013 By 18 Comments
… standalone Innodb instance Let’s break it down a bit. Our unit of locking in Innodb is a single row (well, the PRIMARY KEY index entry for that row). This means typically on a single Innodb node… the first and while the first is still in the local apply queue on their nodes will get a deadlock error…
Post: Long PRIMARY KEY for Innodb tables
October 3, 2006 By 8 Comments
… PRIMARY KEYs with Innodb tables due to the fact all other key will refer to the rows by primary key. I also recommended to use sequential primary keys… update CURRENT_TIMESTAMP, PRIMARY KEY (`url`,`thumb_width`,`thumb_height`) ) ENGINE=InnoDB; Why did I use this solution compared to others: Innodb Tables – This… a key – it is often many images from one domain/album are inserted at about same time which makes access locality much…
Post: InnoDB vs MyISAM vs Falcon benchmarks - part 1
January 8, 2007 By 117 Comments
… parameters: For MyISAM / InnoDB ./configure –prefix=/usr/local/mysqltest/mysql- –with-innodb For Falcon ./configure –prefix=/usr/local/mysqltest/mysql- –with-falcon… with access by primary key. InnoDB is faster than MyISAM by 6-9%. Falcon shows very bad scalabilty. READ_KEY_POINT Query:…
Post: Heikki Tuuri Innodb answers - Part I
October 26, 2007 By 19 Comments
… Innodb secondary Indexes trees are allocated in two extents same as primary key tree or stored in the same extent ? HT: An InnoDB extent… of the 768 byte local storage in the record. In that source code tree, InnoDB only needs to store locally a prefix of… different CPUs. Q25: In InnoDB, the referenced columns of a foreign key constraint need not form a primary key or a unique constraint: it…
Post: MyISAM Scalability and Innodb, Falcon Benchmarks
October 12, 2007 By 10 Comments
… select_type: SIMPLE table: t1 type: eq_ref possible_keys: PRIMARY,id key: PRIMARY key_len: 4 ref: scale.t2.t1_id rows: 1 Extra… still held when key block is copied to processing thread local storage on Key Read Request. This lock is per key cache so if… 493 16 498 InnoDB both performs much better in this case (not surprisingly as there is a lot of primary key lookups) but…
Post: Innodb row size limitation
April 7, 2011 By 12 Comments
… TEXT, fdisclaimer TEXT, fcopyright TEXT, fstylesheet TEXT, fterms TEXT, PRIMARY KEY (id) ) Engine=InnoDB; Now you insert some test data into it: mysql… http://www.mysqlperformanceblog.com/2010/02/09/blob-storage-in-innodb/ for further reference). It’s worth mentioning that this limit… bytes, then you’ll have at least 8448 bytes for local storage, not counting other fixed length columns. This exceeds the…
Comment: How to find wrong indexing with glance view
March 8, 2010 By 27 Comments
Here’s to hoping that eventually MySQL’s InnoDB becomes close to on par with the competition – in particular … that this is not the case. Updates and deletes of primary key values are instead restricted – that is not permitted. So the…_id int unsigned not null auto_increment primary key, item_type_id tinyint unsigned not null, locale_id smallint unsigned not null, currency…
Post: PBXT benchmarks
April 8, 2007 By 14 Comments
… MyISAM / InnoDB and pbxt-0.9.85-beta.tar.gz Compilation parameters: For MyISAM / InnoDB ./configure –prefix=/usr/local/mysqltest/mysql- –with-innodb Method… PK values. PBXT is much worse here because of InnoDB clustering by primary key. InnoDB does not need an extra lookup to access to…
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…
