To rename a table in MySQL you just need to run a command named RENAME TABLE, the syntax is very easy to use. RENAME TABLE table1 TO table2; The RENAME TABLE command will rename the table atomically, which means your table will be locked during the command. You can also rename more than one … Read more
The myisamchk utility gets information about your database tables or checks, repairs, or optimizes them. myisamchk works with MyISAM tables (tables that have .MYD and .MYI files for storing data and indexes). The use of myisamchk with partitioned tables is not supported. How to run this Utility – myisamchk myisamchk [options] tbl_name The options specify … Read more
In this post we will see how can we optimize where clause. Where clause restrict the result set to a range. Basically this is used to access the range of a table/view. The range access method uses a single index to retrieve a subset of table rows that are contained within one or several index … Read more
The busiest file in the InnoDB infrastructure is /var/lib/mysql/ibdata1 This file normally houses many classes of information (when innodb_file_per_table is 0) Table Data Table Indexes MVCC (Multiversioning Concurrency Control) Data Rollbacks Segments Undo Tablespace Table Metadata Many people create multiple ibdata files hoping for better diskspace management and performance. It does not help. Unfortunately, OPTIMIZE TABLE against … Read more