….24 Configuration innodb_file_per_table=1 innodb_file_format=barracuda innodb_log_file_size=512M innodb_log_files_in_group=2 innodb_flush_log…’ join_buffer_size=32M MariaDB 5.5.20 Configuration innodb_file_per_table=1 innodb_file_format=barracuda innodb_log_file_size=512M innodb_log…`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 Test Cases Now let’s see the test cases and then see how the joins perform for…
Post: Join Optimizations in MySQL 5.6 and MariaDB 5.5
April 4, 2012 By 4 Comments
… are the join optimizations when the workload fits entirely in memory. For the purpose of benchmarking in-memory workload, the InnoDB buffer… are the join optimizations when the workload is IO bound. For the purpose of benchmarking IO bound workload, the InnoDB buffer pool… 2.2G Innodb_data_reads 329115 355323 143808 335526 16164 15506 Innodb_pages_read 329115 355323 143808 358308 144798 144881 Innodb_rows_read…
Post: Using CHAR keys for joins, how much is the overhead ?
June 18, 2007 By 18 Comments
….1.18 using MyISAM and Innodb tables. This time unlike other benchmarks I decided to do Join not on primary key and… as default ? Joining on Char columns completes in 4.5 seconds on Innodb which is about 50% slower compared to Joining on Int….5 seconds which is just 20% slower than integer based join for Innodb. Finally I decided to check if using longer strings…
Post: Avoiding auto-increment holes on InnoDB with INSERT IGNORE
November 29, 2011 By 8 Comments
… configurable and you can select from different algorithms using the innodb_autoinc_lock_mode. By default the value is 1, which…`) ) ENGINE=InnoDB; Insert a value using a LEFT OUTER JOIN: insert into foo(name) select 1 from mutex left outer join foo on…) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `uniqname` (`name`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1 No gaps at all…
Post: Enum Fields VS Varchar VS Int + Joined table: What is Faster?
January 24, 2008 By 30 Comments
….085637 3) Results for INT + join: select SQL_NO_CACHE c.city from cities_join c JOIN states s ON (s.id = c… be larger. It is also interesting to note performance of Innodb tables in this case: for VARCHAR it takes about 0… when Innodb is much faster than MyISAM for Read load. The other surprise could be almost zero cost of the join, which…
Post: Join performance of MyISAM and Innodb
May 29, 2006 By 6 Comments
We had discussion today which involved benchmarks of Join speed for MyISAM and Innodb storage engines for CPU bound workload, this is… Innodb is actually faster than MyISAM in 2 cases out of 3. I guess the reasons are the following: Innodb primary key joins are very fast as data is clustered together with index and generally highly optimized Innodb builds hash…
Post: JOIN Performance & Charsets
October 21, 2008 By 2 Comments
… on joined columns can have a significant impact on the performance of your queries. Take the following example, using the InnoDB storage…, `v` varchar(128) NOT NULL, PRIMARY KEY (`char_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE `t2` ( `id` int unsigned NOT…(128) NOT NULL, PRIMARY KEY (`id`), KEY (`char_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; t1 has been populated with 100,000…
Post: Helgrinding MySQL with InnoDB for Synchronisation Errors, Fun and Profit
November 24, 2011 By 2 Comments
… version (pre-5.1.61) and a single test, innodb_plugin.innodb_bug53674. The test is chosen for no particular reason except… (srv0start.c:1514) ==9090== by 0x6B48855: innobase_init(void*) (ha_innodb.cc:2284) ==9090== by 0x712F17: ha_initialize_handlerton(st_plugin…_schema_table_state) (sql_show.cc:6238) ==9090== by 0x6A5E0C: JOIN::exec() (sql_select.cc:1863) ==9090== by 0x6A7D72: mysql_select…
Comment: How well does your table fits in innodb buffer pool ?
December 9, 2010 By 12 Comments
…_id = innodb_sys_indexes.index_id JOIN innodb_sys_tables ON innodb_sys_indexes.table_id = innodb_sys_tables.table_id JOIN innodb_index_stats ON innodb_index_stats.table_name = innodb_sys…
Post: Side load may massively impact your MySQL Performance
November 13, 2011 By 7 Comments
…=oltp –db-driver=mysql –mysql-host=localhost –mysql-table-engine=innodb –mysql-db=test –oltp-table-name=md_cache_test_small… data_size_mb from innodb_sys_tables as t inner join innodb_sys_indexes as i using(table_id) inner join innodb_buffer_pool_pages… be concentrated within very small period of time so setting innodb_old_blocks_time variable to some value will prevent important…
