On Exadata X11M the database half of your skills stops at the compute node — the storage cells run their own OS and their own CLI. This cellcli cheat sheet gives Oracle DBAs the 25 storage-cell commands that matter: listing physicaldisks, LUNs, celldisks and griddisks, managing flashcache and flashlog, reading cell metrics, and fanning commands across every cell with dcli.

A full tablespace and an ORA-01653 at 2 a.m. is one of the most common Oracle DBA pages. This 2026 playbook shows how to diagnose with DBA_TABLESPACE_USAGE_METRICS, then resize datafiles, add datafiles, enable autoextend, reclaim space, and use the new Oracle 26ai bigfile tablespace shrink — with copy-paste SQL for 19c and 26ai.

Oracle Data Guard Fast-Start Failover (FSFO) promotes your standby automatically when the primary dies — no DBA, no 2 a.m. phone call. This hands-on Oracle 19c & 26ai lab configures FSFO end-to-end in DGMGRL: MAXAVAILABILITY protection mode, the failover target, the Observer on a third site, auto-reinstate with Flashback, and safe Observe-Only testing.