MySQL provides this feature; you can use the FORM or IN clause in the query:mysql> SHOW TABLES FROM schema_name; ORmysql> SHOW TABLES IN schema_name; These are the basic queries that help you to fetch basic details from a schema. However, you also modify this query more, which will...
While working, the customer raised two interesting questions: how can he make complete use of the performance schema, and how can he find what he requires? I realized that it is important to understand the insights of the MySQL performance schema and how we can make effective use of it. ...
Begin reviewing the top queries in times of resource usage Note – you can also use the performance schema to identify queries, but setting that up is outside the scope of this post. Here is a good reference on how to use P_S to find suboptimal queries. When looking for bad queries, ...
MySQL is adding more tools to monitor its internals with every new release, but one thing it still lacks is a way to find out who is locking what, and therefore which transactions block which other ones. This is such a vital feature that I’m considering writing my own patch to the sou...
How tofind out and change thestorageengine of tables inMySQLdatabases? Find out thestorageengine of a table in adatabase: SELECTENGINEFROMinformation_schema.TABLESWHERETABLE_SCHEMA ='database'ANDTABLE_NAME ='table' Change the storage engine of a table: ...
Command to export a database in MySQL You can create a dump file from the command line. For this, you can use themysqldumpcommand. mysqldump -u‹username› –p‹password› database_name table_name > dumpfile_name.sql In this command: ...
select table_schema, sum(data_length) Z from information_schema.tables where table_schema not in ('information_schema','performance_schema') group by table_schema having z=0; Sorry, you can't reply to this topic. It has been closed. ...
What it cannot find is corruption that involves only the data file (which is very unusual). If you want to check a table, you should normally run myisamchk without options or with the -s (silent) option. myisamchk -m tbl_name This finds 99.999% of all errors. It first checks ...
Begin reviewing the top queries in times of resource usage Note – you can also use the performance schema to identify queries, but setting that up is outside the scope of this post. Here is a good reference on how to use P_S to find suboptimal queries. When looking for bad queries, ...
At first, i have to mention the architecture in Figure1which is used all the time when you search the keywords 'Nosql' && 'MySQL'. Figure Figure 1: Memcached with InnoDB Architecture 3 Get MySQL source code MySQL with memcached was just in MySQL Labs before, now it's contained in trunk...