SQLCODE -551 authorization failure

SQLCODE -551: authorization failure — the auth ID lacks the privilege for this operation.

What it means

• After every EXEC SQL, DB2 returns a SQLCODE: 0 means success, +100 means no row found, and negative values mean an error.

Common causes

• New program or user without GRANTs.
• Deployed to an environment where grants were not repeated.
• Wrong plan owner.

How to diagnose

• Identify the missing privilege from SQLERRM.
• Check grants: SELECT from SYSIBM.SYSTABAUTH etc.
• Confirm the auth ID the program runs under.

How to fix it

• GRANT the required privilege.
• Repeat grants in every environment as part of deployment.

Example: Include GRANTs in deployment

Missing grants are a deployment step, not a code bug.

Interview tip

• Q: How would you troubleshoot a SQLCODE -551 authorization failure in production?
• A: I would check the SQLCODE and SQLERRM immediately after the failing statement, reproduce in SPUFI, then apply the specific fix.

Prevention checklist

• Always check SQLCODE after every EXEC SQL statement.
• Log the SQLCODE, SQLSTATE and failing statement for support.