July Recap: PostgreSQL Skills Every Oracle DBA Needs

The SQL Is the Easy Part

A month of writing about PostgreSQL platforms, performance, and operations keeps circling one point: for an Oracle DBA, the syntax is rarely what makes a migration hard. The real shift is operational — a different mental model for how the database stays fast, safe, and available. Here are the skills that carry the most weight, each mapped from the Oracle concept you already know.

1. Read pg_stat_statements Instead of AWR

Your instincts from AWR and ASH transfer directly — you just read them through pg_stat_statements and EXPLAIN (ANALYZE, BUFFERS). Learn to spot the expensive normalized statements and to read a plan tree, and you have most of the tuning workflow you relied on.

2. Think in MVCC, VACUUM, and Bloat

There is no undo/redo split. PostgreSQL keeps old row versions in the table and reclaims them with VACUUM, so understanding autovacuum, bloat, and freezing is the operational skill that most separates a smooth PostgreSQL estate from a troubled one.

3. HA and Backup, the PostgreSQL Way

• Data Guard → streaming replication, often orchestrated with Patroni for automatic failover.
• RMAN → pgBackRest or pg_basebackup for full, incremental, and point-in-time recovery.
• Logical standby → logical replication for selective, cross-version, and zero-downtime-cutover scenarios.

4. Tune the Engine, Not the SGA

Instead of SGA/PGA, you shape memory with shared_buffers, work_mem, effective_cache_size, and the autovacuum settings. A handful of parameters in postgresql.conf, matched to your hardware and workload, covers most of the tuning an Oracle instance needed from dozens.

5. Know the Ecosystem

Part of the July thread was the landscape itself — RDS and Aurora, Cloud SQL and AlloyDB, Azure’s Flexible Server, and newer platforms like Neon and Supabase. Because they all run standard PostgreSQL, learning the engine once keeps every one of these options open to you. That portability is, in the end, the strongest argument for the move.