Multi-Cloud Database Architecture: Oracle, AWS, Azure, GCP Reference Guide (2026)

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Multi-Cloud Database Architecture: Oracle, AWS, Azure, GCP Reference Guide

Production-Proven Reference Architectures for Enterprise DBAs

📅 February 04, 2026

👤 Chetan Yadav - Senior Oracle & Cloud DBA

⏱️ 20-22 min read

⏱️ Estimated Reading Time: 20–22 minutes

☁️ Multi-Cloud Database Architecture - Oracle, AWS RDS, Azure SQL, GCP AlloyDB

Six months ago, our CTO announced we were moving to a "multi-cloud strategy." The board wanted vendor independence. Engineering wanted best-of-breed services. Finance wanted competitive pricing.

I was the DBA who had to make it actually work.

Designing multi-cloud database architecture isn't about running the same database everywhere. It's about knowing which workload belongs on which platform, how to synchronize data across clouds, and when vendor lock-in is actually acceptable.

This guide covers reference architectures from production systems running across Oracle on-premises, AWS RDS, Azure SQL Managed Instance, and GCP AlloyDB. If you're a DBA planning or managing multi-cloud databases, these are the patterns that 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.