select count(1) from performance_schema.setup_instruments; +----------+ | count(1) | +----------+ | 1269 | +----------+ For easy understanding, instruments can be divided into seven different parts as shown belo
1. Navigate toDatabase>Backup and Restore>Backup Database. 2. Configure the options in theDatabase Backup Wizardwindow and clickNext. 3. Select database objects to back up and clickNext. 4. Set the backup options. To immediately export a MySQL database to a SQL file, clickBackup. To co...
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2. Select adatabase serverin theMySQL Connectionssection. When prompted, type the account password. 3. Click the database icon in the Workbench toolbar to start creating adatabase schema. Alternatively, select theSchemastab in the window pane on the left side. Right-click anywhere in the bla...
Data_free. Shows the unused space allocated to the table. Tip 2: Show Unused Space for All Tables Theinformation schemastores metadata about adatabase schema. To check the allocated unused data for all tables in a schema, run: SELECT table_name, data_length, data_free ...
If your report includes long query output lines from test cases that you run with themysqlcommand-line tool, you can make the output more readable by using the--verticaloption or the\Gstatement terminator. TheEXPLAIN SELECTexample later in this section demonstrates the use of\G. ...
secure enough. Would you like to set up the VALIDATE PASSWORD plugin? Press y|Y for Yes, any other key for No: If you answer “yes”, you’ll be asked to select a level of password validation. Keep in mind that if you enter2for the strongest level, you will receive err...
Before you attempt to perform any schema changes on your production databases, you should make sure that you have a rock solid rollback plan; and that your change procedure has been successfully tested and validated in a separate environment. At the same time, it’s your responsibility to make...
SELECTMIN(key_part2),MAX(key_part2)FROMtbl_nameWHEREkey_part1=10; To sort or group a table if the sorting or grouping is done on a leftmost prefix of a usable index (for example,ORDER BYkey_part1,key_part2). If all key parts are followed byDESC, the key is read in reverse ord...
I want to grant select on DB in formation_schema to an user, but got the below error. How to grant select privilege on all tables of information_schema to an user ? mysql> grant select on information_schema.* to 'mytest'@'%' identified by 'test1234'; ...