How to set read-only permissions on a table in Oracle database?

In the Oracle database, setting read-only permissions on tables is a very important operation, which can protect data security and prevent misoperations. The following will introduce how to set read-only permissions on tables in an Oracle database and provide specific code examples.

First of all, we need to understand that in the Oracle database, users obtain permissions on tables through authorization. Table permissions include SELECT (query), INSERT (insert), UPDATE (update) and DELETE (delete) operations. Here, we will introduce how to set read-only permissions for users, which only allows users to query the data of the table and does not allow any modification to the table.

The following are the specific steps and corresponding code examples:

Step 1: Create a new read-only user

CREATE USER readonly_user IDENTIFIED BY password; 

Step 2: Grant permissions to query the table

GRANT SELECT ON table_name TO readonly_user;

Step 3: Revoke other operation permissions

REVOKE INSERT, UPDATE, DELETE ON table_name FROM readonly_user;

Step 4: Confirm that the permissions are set successfully

SELECT * FROM all_tab_privs 
WHERE grantee = 'readonly_user' 
AND table_name = 'table_name';

In this way, we have successfully granted read-only permissions to the table to the new user. Read-only users will be able to query the table's data, but will not be able to make any modifications to the table.

It should be noted that permission setting is a very important operation and needs to be performed with caution. When setting permissions for users, it is important to ensure that only necessary permissions are granted to ensure data security and integrity.

To summarize, through the above steps and code examples, we can set read-only permissions on tables in the Oracle database to protect the security of the data and ensure that the data is not maliciously tampered with or deleted.

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