June 18, 2013

Post: MySQL 5.6 vs MySQL 5.5 and the Star Schema Benchmark

…PERFORMANCE_SCHEMA, and paths are unique for basedir and datadir I… mysql> select * from information_schema.global_status where variable_name like ‘%innodb%read%’; …1. row ************************************************ 1. row ******* POOL_ID: 0 * POOL_ID: 0 POOL_SIZE: 8192 *…

Post: How much overhead is caused by on disk temporary tables

unique “c” column. mysql> explain select count(*) cnt,c from gt group by c order by null limit 10; +—-+————-+——-+——+—————+——+———+——+———+—————–+ | id…(0.00 sec) Ahh… I alway forget GLOBAL only sets global value but it does not affect current…

Post: InnoDB Full-text Search in MySQL 5.6: Part 2, The Queries!

… what comes back: mysql: SET GLOBAL innodb_ft_server_stopword_table=’…BY 3 DESC LIMIT 1; +——-+—————-+——————–+ | id | full_name | score | +——-+—————-+——————–+ | 62633 | Thomas B Smith |… although Japanese poses its own unique problems for FTS of any…

Post: How Percona does a MySQL Performance Audit

… money your application is not as unique as you think, and we … /proc/cpuinfo power management: processor : 7 vendor_id : GenuineIntel cpu family : 6 model : 15 … I’ll paste in mysql> show global variables like ‘%table_size%’; +———————+———–+ | Variable_name | Value | …

Post: The new cool MySQL patch has landed! Check your queries performance!

…the queries coming from a single connection. # Thread_id: 4 MICROTIME RESOLUTION QUERY TIMING This is …not include those of InnoDB, which are always global and shared by all the threads. The patch…execution. InnoDB_pages_distinct tells the number of unique pages accessed by the query. This is actually…

Post: mk-query-digest, query comments and the query cache

…includes important information, such as the PHP session ID, and the application user name. This allows … will become very frequent when every query is unique and the query cache will use additional …stripping in Percona Server at runtime: mysql> set global query_cache_strip_comments=’ON’; Query OK, 0…

Post: Paul McCullagh answers your questions about PBXT

…O in the engine. The Sweeper is a thread unique to the PBXT architecture. It’s job is to…RAM. The format is quite compact (especially when row IDs are consecutive) but this can become an issue if…. One of the main problems has been running into global locks when calling back into MySQL to do things…

Post: Figuring out what limits MySQL Replication

…changing it via set global long_query_time… 4032446 total queries, 72740 unique Sorting by ‘c’ __ 001 _______________________________________________________________________ Count…,imagedownload=N WHERE id=N; __ 003 _______________________________________________________________________ Count : 113731…