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