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Oracle to PostgreSQL SQL Conversion Guide: Real-World Examples for DBAs

Complete Syntax Mapping, Function Conversion, and PL/SQL to PL/pgSQL Migration

📅 February 06, 2026

👤 Chetan Yadav - Senior Oracle & PostgreSQL DBA

⏱️ 22-24 min read

⏱️ Estimated Reading Time: 22–24 minutes

🔄 Oracle → PostgreSQL - Real Production SQL Conversions with Before/After Examples

We had 847 stored procedures written in Oracle PL/SQL. The CTO announced we were moving to PostgreSQL to cut licensing costs by $200,000 annually. The migration deadline was three months away.

I spent the first week manually converting procedures. At that pace, I'd finish in 18 months. That's when I realized: most Oracle-to-PostgreSQL conversions follow predictable patterns. Once you know these patterns, conversion becomes systematic, not guesswork.

Oracle to PostgreSQL migration isn't about rewriting everything from scratch. 70-80% of SQL works with minor syntax adjustments. The remaining 20-30% requires understanding key differences in how each database handles data types, functions, and procedural logic.

This guide covers real production SQL conversions from Oracle to PostgreSQL. If you're an Oracle DBA planning a PostgreSQL migration, these are the patterns, gotchas, and solutions that actually work.

GCP AlloyDB Performance Tuning Guide: Oracle 19c Comparison for DBAs (2026)

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GCP AlloyDB Performance Tuning Guide: Oracle 19c DBAs' Complete Migration Handbook

What Works, What Doesn't, and What Performance Surprises to Expect

📅 February 03, 2026

👤 Chetan Yadav - Senior Oracle & Cloud DBA

⏱️ 18-20 min read

⏱️ Estimated Reading Time: 18–20 minutes

🚀 GCP AlloyDB vs Oracle 19c - Performance Tuning from a Veteran DBA's Perspective

Three months after our team moved a critical Oracle 19c OLTP system to GCP AlloyDB, the CFO asked in the quarterly review, "Are we seeing the 4x performance improvement Google promised?"

I had the AWR reports from Oracle and the performance metrics from AlloyDB. Same queries, same data volume, same transaction load. The answer was more nuanced than a simple yes or no.

Some queries ran 6x faster in AlloyDB. Others ran slower. The difference wasn't the database—it was understanding which PostgreSQL-based optimizations AlloyDB uses and how they compare to Oracle's approach.

This guide is what I learned comparing Oracle 19c performance tuning to GCP AlloyDB in production. If you're an Oracle DBA evaluating AlloyDB, this covers the performance differences that actually matter.

Azure Managed Instance Migration Checklist: Oracle DBA's Step-by-Step Guide 2026

Azure Managed Instance Migration Checklist for Oracle DBAs

Your Complete Pre-Migration, Migration, and Post-Migration Validation Guide

📅 February 02, 2026

👤 Chetan Yadav - Senior Oracle & Cloud DBA

⏱️ 16-18 min read

⏱️ Estimated Reading Time: 16–18 minutes

☁️ Azure Managed Instance Migration - Enterprise-Grade Oracle to Cloud Migration

Two weeks before our planned Azure migration cutover, the project manager asked me, "We've tested the migration three times in dev. What could possibly go wrong in production?"

I showed him my checklist. Sixty-three items. He thought I was being overcautious. Until we hit production and discovered our application connection strings were hardcoded with Oracle-specific syntax that Azure SQL Managed Instance didn't support. The migration succeeded, but the application couldn't connect.

That's when he understood: migration isn't just moving data. It's validating every assumption about how your application interacts with the database.

This checklist represents lessons from five Azure Managed Instance migrations, including two that required emergency rollbacks. If you're an Oracle DBA planning an Azure migration, this is the checklist I wish I had on my first project.