PG17 PGSizer Tiếng Việt (VI)

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PARTMAN-LEDGER // Time-Series, Events & Fintech

High-Write Declarative Partitioning (`pg_partman`), UUIDv7 & B-Tree Bloat Control

Random UUIDv4 primary keys destroy PostgreSQL write performance once a B-Tree index outgrows RAM: every single INSERT dirties a cold 8KB page. Switching to UUIDv7 + monthly declarative partitions keeps the active B-Tree leaf window tiny and pinned in shared_buffers.

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PGSizer RAM, Buffer & NVMe Sizing Matrix for PARTMAN-LEDGER

Deployment Scale Memory Allocation Buffer / Pool Setting Matched Node Tier Architecture Target
15K INSERT/s Event Stream (250 GB) 32 GB High-Freq NVMe 8GB (Hot Month Pinned) Vultr HF 32GB / Hostinger KVM 8 UUIDv7 + LZ4 WAL
40K INSERT/s Fintech Ledger (1 TB) 64 GB Bare-Metal Ryzen 16GB + ZFS/RAID10 InterServer Ryzen 64GB (2TB) Zero Vacuum Freeze Stall
85K+ INSERT/s Telemetry (2 TB+) 128 GB Dedicated EPYC/Ryzen 32GB – 40GB UltaHost / InterServer 128GB Instant DROP TABLE Retention

PGSizer Configuration Snippet & DBA Rules for PARTMAN-LEDGER

-- Declarative Monthly Partitioning + Time-Ordered UUIDv7 Primary Keys
CREATE TABLE ledger_events (
  event_id    uuid NOT NULL,          -- Generate RFC 9562 UUIDv7 in app / pg_uuidv7!
  created_at  timestamptz NOT NULL DEFAULT now(),
  account_id  bigint NOT NULL,
  amount_minor bigint NOT NULL,
  payload     jsonb,
  PRIMARY KEY (created_at, event_id)
) PARTITION BY RANGE (created_at);

CREATE TABLE ledger_events_2026_11 PARTITION OF ledger_events
  FOR VALUES FROM ('2026-11-01') TO ('2026-12-01');

-- Tune WAL & Checkpoints for Sustained Heavy Writes
ALTER SYSTEM SET max_wal_size = '16GB';
ALTER SYSTEM SET wal_compression = 'lz4';
ALTER SYSTEM SET commit_delay = 20;   -- Microsecond group-commit batching
  • Replace gen_random_uuid() (UUIDv4) with RFC 9562 UUIDv7 immediately on tables exceeding 20 million rows: sequential right-leaning B-Tree appends cut WAL write amplification by up to 65%.
  • Size partitions so the current active partition + its indexes fit inside 50% of shared_buffers (typically weekly or monthly ranges, ~15GB–40GB per child table).
  • Expiring old retention data with ALTER TABLE ... DETACH PARTITION CONCURRENTLY followed by DROP TABLE reclaims hundreds of gigabytes instantaneously with zero dead-tuple bloat!

Matched NVMe Providers for PARTMAN-LEDGER 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.

PGSizer DBA Questions for PARTMAN-LEDGER

Should I create 1,000+ daily partitions in PostgreSQL 17?

Avoid thousands of tiny partitions unless queries strictly prune on the partition key every time — planner lock & metadata overhead rises above ~500–800 partitions. Monthly or weekly partitions keeping active child tables around 20GB–50GB is optimal.

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