Oracle

Sessions, waits, blocking, and health checks.

AWR, ASH, SQL tuning, and plan analysis.

Cluster, CRS, and node management.

Standby, gap, and switchover checks.

RMAN, restore, and validation.

Tablespaces, segments, and growth.

Accounts, roles, and grants.

Auditing, encryption, and access control.

Opatch, datapatch, and upgrades.

Redo logs, archiving, and generation rates.

Disk groups, disks, and rebalance operations.

Blocking, locks, active sessions, and killing sessions.

Optimizer statistics: gathering, staleness, and history.

Pluggable databases: status, open, close, and create.

DBMS_SCHEDULER jobs, runs, and status.