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Database / ValKey Interview questions

What is the role of ACLs in Valkey?

ACLs let an administrator define multiple named users, each with their own password(s), rather than relying on a single shared requirepass value for everyone.

ACL SETUSER appuser on >secretpass ~app:* +get +set +del -flushall
ACL WHOAMI
ACL LIST
ACL LOG

Each user can be restricted to specific commands or command categories, specific key patterns, and specific pub/sub channels, enabling least-privilege access for multi-tenant applications; denied attempts are recorded in ACL LOG for auditing, and Valkey 9.1 extends ACLs further with database-level access scoping.

ACL SETUSER lets an admin restrict a user to...
Denied command attempts by ACL-restricted users can be reviewed via...

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