Zero-Downtime AWS RDS / Aurora to Self-Hosted PostgreSQL 17 NVMe Migration
Stop paying 6x–10x markups for throttled 3,000-IOPS gp3 volumes and metered Aurora I/O. Native PostgreSQL Logical Replication streams live writes from AWS RDS to your new PG17 NVMe node until cutover takes <5 seconds.
PGSizer RAM, Buffer & NVMe Sizing Matrix for RDS-EXIT-TCO
| Deployment Scale | Memory Allocation | Buffer / Pool Setting | Matched Node Tier | Architecture Target |
|---|---|---|---|---|
| RDS db.t4g.large -> Hostinger KVM 4 | 8GB RDS -> 16GB DDR5 VPS | $165/mo -> $10.49/mo |
200 GB Gen4 NVMe | Save ~$1,850 / year |
| RDS db.r6i.xlarge Multi-AZ -> KVM 8 | 32GB RDS -> 32GB DDR5 VPS | $640/mo -> $19.99/mo |
400 GB Gen4 NVMe | Save ~$7,440 / year |
| RDS db.r6i.2xlarge + io2 -> UltaHost VDS | 64GB RDS -> 64GB Dedicated VDS | $1,420/mo -> $68.00/mo |
800 GB RAID-10 NVMe | Save ~$16,200 / year |
PGSizer Configuration Snippet & DBA Rules for RDS-EXIT-TCO
-- Step 1 (On AWS RDS Parameter Group: rds.logical_replication = 1)
CREATE PUBLICATION rds_exit_pub FOR ALL TABLES;
-- Step 2 (On Target PostgreSQL 17 NVMe VPS over SSL / WireGuard)
CREATE SUBSCRIPTION rds_exit_sub
CONNECTION 'host=mydb.xxxx.us-east-1.rds.amazonaws.com port=5432 user=migrator dbname=prod sslmode=require'
PUBLICATION rds_exit_pub
WITH (copy_data = true, streaming = parallel);
-- Step 3: Sync sequence values right before 5-second app DSN switch!- Logical replication copies table rows and live DML (INSERT/UPDATE/DELETE) across major versions (e.g., RDS PG 14/15 directly into self-hosted PostgreSQL 17!), making it a simultaneous upgrade + repatriation.
- Remember that PostgreSQL logical replication does NOT replicate sequence counters automatically — run a sequence sync script right after pausing writes during your 5-second cutover window.
- Export pg_dump --schema-only from RDS first and apply it onto your target PG17 server before starting CREATE SUBSCRIPTION.
Matched NVMe Providers for RDS-EXIT-TCO on PGSizer (2026-11-12 Public Rates)
Public rates retrieved 2026-11-12; promotional and renewal prices may change — verify current terms on each vendor checkout page.
UltaHost Dedicated VDS & Bare-Metal (32GB–192GB DDR5 ECC)
Zero I/O Steal Dedicated VDS & Enterprise NVMe RAID-10 for 250GB–2TB+ Postgres Clusters
Hostinger KVM NVMe VPS (AMD EPYC + PostgreSQL 17 / Docker)
Up to 67% OFF + Extra 20% Partner Discount (8GB–32GB DDR5 ECC + PCIe Gen4 NVMe)
Vultr PostgreSQL 17 & HA Replica Lab ($300 Free Credit)
$300 Free 30-Day Cloud Credit to Run pgbench, Logical Replication & PITR Drills
PGSizer DBA Questions for RDS-EXIT-TCO
How do I replace RDS automated Point-in-Time Recovery after migrating?
Pair WAL-G or pgBackRest with S3-compatible object storage (Cloudflare R2 / Backblaze B2 / AWS S3). Continuous archive_command shipping gives you identical 1-second PITR for pennies per gigabyte.
Additional PGSizer Blueprints Related to RDS-EXIT-TCO
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PG17-OLTPOpen PG17-OLTP Blueprint on PGSizer →
PostgreSQL 17 OLTP SaaS Tuning Blueprint (shared_buffers, Vectorized I/O & Autovacuum)
Out-of-the-box PostgreSQL 17 ships with a conservative 128MB shared_buffers and spinning-disk cost assumptions (random_page_cost = 4.0). Unlocking PCIe Gen4 NVMe speed requires tuning buffer residency, vectorized read-ahead, and aggressive autovacuum.
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PGBOUNCER-POOLOpen PGBOUNCER-POOL Blueprint on PGSizer →
PgBouncer Transaction Pooling for 2,000+ Serverless & Node.js Connections
Every raw PostgreSQL connection forks an OS process (~9.5MB RSS) and inflates Snapshot/LockManager contention. PgBouncer multiplexes 2,000+ ephemeral Next.js/Serverless sockets onto 80–120 warm Postgres backends at ~2KB per client.
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PGVECTOR-HNSWOpen PGVECTOR-HNSW Blueprint on PGSizer →
pgvector 0.8 + PostgreSQL 17 Hybrid Search (HNSW halfvec + BM25 / GIN)
Consolidate relational metadata, RBAC permissions, and million-scale AI embeddings inside a single ACID database. With pgvector 0.8 halfvec (16-bit floats), HNSW index memory drops by 50% with >99.2% recall.