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Separating Reader and Writer Roles on a Production Sales Table

I recently took on the responsibility of managing access to a critical production table in our data warehouse: production.sales.orders. This table is used by multiple teams, including data analysts and data engineers, but I noticed that the current permissions were too broad. Everyone had full access, which wasn’t ideal for security and compliance. My task was to separate the reader and writer roles so that only the right people could modify the data while others could only read it.

Granting SELECT Permissions to Sales Readers

I started by identifying the group that should have read-only access to the production.sales.orders table. This group was named sales_readers, and they needed the ability to query the table without being able to make any changes. To do this, I ran the following SQL command:

GRANT SELECT ON TABLE production.sales.orders TO `sales_readers`;

I noticed that the command executed without any errors, and the message confirmed that the grant was applied successfully. This meant that the sales_readers group now had the ability to read from the production.sales.orders table, which was exactly what I needed for the analysts who rely on this data for reporting.

Granting MODIFY Permissions to Sales Writers

Next, I needed to ensure that the data engineers, who are responsible for updating the production.sales.orders table, had the appropriate permissions. I decided to grant them the MODIFY privilege, which allows them to insert, update, and delete records in the table. I ran the following command:

GRANT MODIFY ON TABLE production.sales.orders TO `sales_writers`;

Again, the command executed successfully, and the system confirmed that the sales_writers group now had the MODIFY privilege. This ensured that the engineers could make the necessary changes to the table while maintaining data integrity and security.

Verifying the Grants

Before finalizing the changes, I wanted to double-check the permissions to ensure that everything was set up correctly. I ran the SHOW GRANTS command on the production.sales.orders table to confirm the current access settings:

SHOW GRANTS ON TABLE production.sales.orders;

<

principal	actionType	objectType
data_analysts	SELECT	TABLE
data_engineers	MODIFY	TABLE

I verified that the grants were applied correctly. The data_analysts group had the SELECT privilege, and the data_engineers group had the MODIFY privilege. This separation of roles ensured that only the right people had access to the right actions, improving both security and operational efficiency.

By carefully managing access to the production.sales.orders table, I was able to enforce a clear separation of duties, which is essential for maintaining data integrity and compliance in a production environment.