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MySQL Database Administrator

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Wednesday, 26 June 2019

After change the user privileges, When Changes Take Effect ?

You can modify the user privileges with two methods ...

Changes Take Effect- Immediately

If you modify the grant tables indirectly using an account-management statement (Examples include GRANT, REVOKE, SET PASSWORD, and RENAME USER), the server notices these changes and loads the grant tables into memory again immediately. 

Changes Take Effect - After issuing FLUSH PRIVILEGES or restart MySQL

If you modify the grant tables directly using statements such as INSERT, UPDATE, or DELETE , the changes have no effect on privilege checking until you either tell the server to reload the tables or restart it.

To tell the server to reload the grant tables, perform a flush-privileges operation. This can be done by issuing a FLUSH PRIVILEGES statement or by executing a mysqladmin flush-privileges or mysqladmin reload command.

A grant table reload affects privileges for each existing client session as follows:

Table and column privilege changes take effect with the client's next request.

Database privilege changes take effect the next time the client executes a USE db_name statement.

Client applications may cache the database name; thus, this effect may not be visible to them without actually changing to a different database.

Global privileges and passwords are unaffected for a connected client. These changes take effect only in sessions for subsequent connections.

Reference and Copyright to Reference Manual

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