RAG Explained Simply: How Retrieval-Augmented Generation Really Works
A plain-language guide to RAG, why it matters, where vector search fits, and how to think about retrieval quality before building an AI assistant.
Oracle DBA notes · Automation · Real operations
Practical DBA engineering notes. Oracle, automation, and SRE.
DBApreneur is my working notebook for Oracle Database, Exadata, GoldenGate, Cassandra, MongoDB, PostgreSQL, automation, and AI-assisted database operations.
[ORACLE] Architecture, tablespaces, users, patching, upgrades
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[GOLDENGATE] Setup, resync, migration, monitoring
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[SRE] Backup, PITR, scaleout, fleet operations
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[AUTOMATION] Bash, Python, Ansible, Terraform
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[PERFORMANCE] AWR, ASH, tuning, health checks
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[ORACLE] Architecture, tablespaces, users, patching, upgrades
◆
[GOLDENGATE] Setup, resync, migration, monitoring
◆
[SRE] Backup, PITR, scaleout, fleet operations
◆
[AUTOMATION] Bash, Python, Ansible, Terraform
◆
[PERFORMANCE] AWR, ASH, tuning, health checks
◆
DBA libraries
Start with the hands-on material.
Step-by-step tutorials and practical scripts, organized by database technology.
01
Oracle Articles
26ai, architecture, space management, users, networking, patching, upgrades, and DBA fundamentals.
02Performance Tuning
AWR, ASH, Exadata, ADB, daily DBA checks, monitoring, and incident-response scripts.
03GoldenGate
Setup, migration, resync, monitoring, patching, and troubleshooting notes.
04Database Tutorials
Cassandra, MongoDB, Couchbase, PostgreSQL, Presto, GoldenGate, and mixed database operations.
Broader themes
What else you'll find here.
Database engineering is the core. I also write about AI, product thinking, automation, and the entrepreneurship path around DBA platforms.
01
Artificial Intelligence
LLMs, RAG, agents, and AI shipped to production.
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02
Database Engineering
SQL Server, Postgres, Oracle, Cassandra, Mongo, Yugabyte — replication, performance, and surviving 3am pages.
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03
Product Management
Discovery, prioritization, and shipping what people use.
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04
Entrepreneurship
Bootstrapping, niches, pricing, and the real reality.
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Latest writing
From the notebook.
Practical DBA notes, architecture write-ups, scripts, and field lessons.
AI Agents for DBAs: What They Can Help With and Where to Be Careful
A practical look at AI agents for DBA work: monitoring, runbooks, SQL explanation, incident triage, and the guardrails needed before automation.
Oracle 26ai Tablespace and Space Management: A Practical DBA Starter Guide
A DBA-friendly introduction to Oracle tablespaces, data files, autoextend, free space, temp usage, undo, and the SQL checks every Oracle admin should know.