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The full form of DCL is Data Control Language. Statements in the (DCL) Data Control Language regulate security & concurrent access to data tables. For the users in the database, access control & permission management are handled using DCL commands. We can simply permit or prohibit certain user operations on tables or records with them.
Features Of Data Control Language
One uses the Data Control Language (DCL) to access the saved data.
- It primarily serves to revoke access and provide the user with the necessary access to databases. This language lacks the rollback mechanism in the database.
- The (SQL) structured query language includes DCL.
- It aids in restricting access to data kept in databases. It is an addition to the (DDL) data definition language and the (DML) data manipulation language.
- The easiest of the three instructions is this one.
- It allows administrators to change and remove users’ database rights as necessary.
- These commands provide, take away, and refuse rights to users so they may access and modify databases.
Data Control Language commands
REVOKE:
The primary goal of the REVOKE command is to revoke any permissions that have previously been refused or given. The ability to access the granted privileges can be removed using the revoke command. Simply said, this operation allows the user to revoke their access. This command revokes or cancels previously granted or refused rights or permissions to users.
Syntax: REVOKE privilege_name ON object_name FROM user_name|PUBLIC|role_name;
GRANT:
The Provide Command grants users access to or rights over database items. The users can access the rights in the database with this command. This command grants users access or permissions to database objects.
Syntax: GRANT privilege_name ON object_name TO user_name|PUBLIC|role_name [WITH GRANT OPTION];
Need For DCL instructions
- Not all database users have permission to do all database activities; for instance, not all users may have the authority to execute all DDL or DML instructions
- The database owner’s or administrator’s obligation is to assign rights to various users based on their responsibilities or business requirements
- It’s being used to manage the rights granted to database users
- It stops other individuals from making modifications or changes to the database by granting or deleting access
- As a result, the DCL offers the essential methods to successfully manage the database, ensuring no other users make modifications that are irrelevant to their function or might jeopardise the database’s security
Benefits of Data Control Language
- It primarily serves to revoke access and provide the user with the necessary access to databases
- Whenever the data is made available to different users, DCL can guarantee security
- DCL is completely safe. It prevents unauthorised individuals from accessing the database
- Administrators can protect data from harm by using the GRANT & REVOKE commands
DCL offers the tools to efficiently manage the database, preventing other users from making alterations that might conflict with their roles or jeopardise the database’s security. DCL manages user access to databases. It permits or prevents the user from obtaining data in the database schema via a DCL command. Any database user’s access rights can be granted or revoked using it. DCL has several benefits and must be employed in the database for security.
