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.

Oracle 23ai and the May 2026 26ai release make AI Vector Search a native part of the database — no separate vector store. This hands-on DBA lab shows you how to create a VECTOR column, build an HNSW vector index, size the Vector Pool, and rank results with VECTOR_DISTANCE in about 15 minutes, with copy-paste SQL for 23ai and 26ai.

The srvctl cheat sheet every working Oracle DBA needs in 2026 — 30 production-tested commands across database, instance, service, listener, SCAN, ASM, nodeapps and PDB resources, version-aware for Oracle 19c, 23ai and 26ai. Includes the three single-letter traps, 26ai PDB resourcification changes, and a hands-on muscle-memory drill for this week.

Production-grade walkthrough for adding a third node to an Oracle 19c RAC cluster using addnode.sh in silent mode. Covers OS preflight, cluvfy -pre nodeadd, Grid Infrastructure extend, root.sh on the new node, RDBMS home extend, and dbca -addInstance — plus the three post-add checks and the three failure patterns that account for 80% of broken add-nodes. Same muscle memory carries straight into 23ai and 26ai. Includes a 7-step workflow diagram and a live lab video.