… locked tables reported in SHOW ENGINE INNODB STATUS you might be confused and rightfully so as Innodb table locking is a bit… unlocking it straight after. Not so for Innodb. Unless table is being locked explicitly Innodb “converts” table lock to “no lock” hence eliminating…. You almost never will run into problems with Innodb table level locks because innodb will only set intentional level locks for everything…
Post: How to recover deleted rows from an InnoDB Tablespace
February 20, 2012 By 4 Comments
…) > select i.INDEX_ID, i.NAME FROM INNODB_SYS_INDEXES as i INNER JOIN INNODB_SYS_TABLES as t USING(TABLE_ID… the error log. mysql (employees) > CREATE TABLE innodb_table_monitor (id int) ENGINE=InnoDB; TABLE: name employees/salaries, id 18, flags 1… recompile the tool. To help us in the task of converting the schema definition to a C header file there is…
Post: Innodb row size limitation
April 7, 2011 By 12 Comments
…, fcopyright TEXT, fstylesheet TEXT, fterms TEXT, PRIMARY KEY (id) ) Engine=InnoDB; Now you insert some test data into it: mysql> INSERT… http://www.mysqlperformanceblog.com/2010/02/09/blob-storage-in-innodb/ for further reference). It’s worth mentioning that this limit… means it is possible that you hit this error after converting from a native language character set to utf8, as it…
Post: MyISAM Scalability and Innodb, Falcon Benchmarks
October 12, 2007 By 10 Comments
… was converting table t1 into InnoDB, and results: Threads Queries/sec 1 296 2 341 4 544 8 493 16 498 InnoDB both… executed being 1/3rd of MyISAM and 1/6th of Innodb. On other hand it scales quite nicely as number of… on system with 4 Cores. Here is comparison of MyISAM Innodb and Falcon results in the graphical form: I’ve created…
Post: InnoDB in self-compiled MySQL 5.1
September 13, 2007 By 9 Comments
… | NO | +————+———+———————————————————–+————–+—-+————+ 4 rows in set (0.00 sec) By default InnoDB is not compiled as storage engines. Perhaps it is related… want to see is BIG Warning or even Error that InnoDB table can’t be created instead of calm converting to MyISAM
Post: What to do with MySQL Full Text Search while migrating to Innodb ?
September 10, 2009 By 12 Comments
… is Full Text Search indexes which are not supported for Innodb tables. So what can you do ? Leave Tables as MyISAM… of MySQL storage engines is you do not have to convert all tables at once. In some cases full text search…. Use “Shadow” MyISAM Table You can keep main data in Innodb but build a “shadow” MyISAM table which is used for…
Post: MySQL Indexing Best Practices: Webinar Questions Followup
August 16, 2012 By 4 Comments
… case you can use trick mentioned in the presentation to convert sort to the union for small ranges. Q: In the… and performance? A: Recent MySQL versions are smart enough to convert id IN (5) to ID=5 (for single item in… benefit to convert BETWEEN into IN-ranges in some cases for better index usage. Q: Is the b+ tree innodb index a…
Post: Flexviews - part 3 - improving query performance using materialized views
April 4, 2011 By 20 Comments
… not supported. ***There is a script to convert SQL to the Flexviews API (see convert.php below) Refresh methods The incremental refresh… working with the Flexviews easier, it includes a script called ‘convert.php’. This script makes it easy to create incrementally refreshable…, simply ignore this column. It is used to prevent wide innodb primary keys on the MV. mysql> select mview$pk as…
Post: JOIN Performance & Charsets
October 21, 2008 By 2 Comments
… performance of your queries. Take the following example, using the InnoDB storage engine: CREATE TABLE `t1` ( `char_id` char(6) NOT… `test`.`t1` join `test`.`t2` where (`test`.`t1`.`char_id` = convert(`test`.`t2`.`char_id` using utf8)) 1 row in set… to execute with t1 as utf8 and t2 as latin1. Converting both tables to utf8 resulted in an average execution time…
Post: Multi Range Read (MRR) in MySQL 5.6 and MariaDB 5.5
March 21, 2012 By 10 Comments
… sorting the secondary key tuples by pk_column, we have converted a lot of point primary key lookups to one or more range primary key lookup. Thereby, converting Random access to one or more sequential access. There is….89G 1.53G Innodb_data_reads 120552 123872 100551 103011 77213 Innodb_pages_read 120548 123868 100551 123592 100566 Innodb_rows_read 799239…
