Why did SQLiteEdge consolidate active single-VPS guides into DokployHub?

In real deployments, a PocketBase, Rails 8 SolidQueue, or LibSQL SQLite WAL database shares VPS RAM and disk bandwidth with Caddy/Traefik, Docker build layers, and background workers. We consolidated active multi-service PaaS sizing into DokployHub (https://dokployhub.pages.dev) and kept the SQLiteEdge PRAGMA generator online as a non-indexed technical archive.

How does SQLiteEdge calculate negative-KiB PRAGMA cache_size vs PRAGMA mmap_size?

Per official SQLite 3.46 documentation, a negative integer in PRAGMA cache_size = -N caps the internal B-tree page heap in kibibytes (25% of VPS RAM in our SQLiteEdge formula, e.g., -2097152 KiB = 2048 MiB on an 8192 MB server). PRAGMA mmap_size maps up to min(DB bytes, 50% VPS RAM, 32 GiB) directly from the Linux page cache for zero-copy reads, and resets to 0 B when LiteFS FUSE is selected.

When does SQLiteEdge set PRAGMA wal_autocheckpoint = 0 for Litestream S3 streaming?

Whenever Litestream S3 or LiteFS replication is selected in the SQLiteEdge studio, wal_autocheckpoint is set to 0 so SQLite does not prematurely overwrite -wal frames before the external replicator compresses and uploads them. Litestream then triggers controlled checkpoints every 1 minute.

Does PRAGMA synchronous = NORMAL risk database corruption in SQLite WAL mode?

According to official SQLite WAL documentation, synchronous = NORMAL preserves full ACID integrity across application crashes, OOM kills, and container restarts because committed frames land immediately in the OS kernel buffer. Only a sudden physical host power loss before a checkpoint could roll back the newest few seconds of commits without corrupting the .sqlite3 file.

Why does SQLiteEdge enforce a 2.3x local NVMe disk capacity rule over raw SQLite DB size?

A 40 GB production .sqlite3 database needs headroom for bursty -wal segments (64 MiB to 128 MiB+), an online VACUUM INTO compaction copy (up to 1.0x DB size temporarily), and Linux OS packages—so our SQLiteEdge formula requires at least 2.3x DB size plus 15 GB on local PCIe NVMe.

SQLITEEDGE // SPLIT-PANE PRAGMA & LITESTREAM STUDIO

SQLiteEdge Split-Pane SQLite 3.46 WAL PRAGMA & Litestream Configurator

We built the SQLiteEdge configuration studio from official SQLite 3.46 Write-Ahead Logging (WAL) documentation and Litestream/LiteFS framing rules so engineers can compute negative-KiB PRAGMA cache_size heaps, 32 GiB-capped mmap_size windows, 5000 ms busy_timeout guards, and 2.3x local NVMe disk margins for 1 GB to 250 GB .sqlite3 datasets.

Every SQLiteEdge init-pragmas.sql download is generated locally in your browser with zero external requests.

1. SQLiteEdge Concurrent Write QPS & Dataset Size

Concurrent Write QPS (5 – 15,000 Write QPS) SQLite DB Size GB (1 – 250 GB)

2. SQLiteEdge Sync Durability & VPS RAM Budget

Sync Durability Mode (PRAGMA synchronous) VPS RAM Allocation (MB)

3. SQLiteEdge Litestream S3 vs LiteFS Replication Strategy

Replication & Checkpoint Strategy

Branch 1 (if synchronous == NORMAL && writeQps == 250): Applies PRAGMA journal_mode = WAL with synchronous = NORMAL: commits append to -wal in OS memory without per-commit disk barriers, sustaining 250 write QPS cleanly.
Branch 2 (if repMode == 'litestream' && dbSize == 25 GB / RAM == 8192 MB): Allocates PRAGMA mmap_size = 4294967296 (4 GiB, bounded by min(DB, 50% RAM, 32 GiB)) plus cache_size = -2097152 (2048 MiB) for zero-copy reads.
Branch 3 (if replication == 'litestream'): Sets wal_autocheckpoint = 0 so Litestream's shadow read lock governs checkpoint intervals (1m) without overwriting unshipped WAL frames.
Branch 4 (NVMe 2.3x Disk Guard & RAM Headroom): RAM Notice: 8192 MB VPS RAM is tight for a 25 GB SQLite file (SQLiteEdge recommends >= 10240 MB RAM and >= 73 GB local NVMe disk).

init-pragmas.sql & litestream.yml — SQLiteEdge Output

-- Generated by SQLiteEdge Archive Studio (SQLite 3.46+ WAL Profile)
-- Workload: 250 Write QPS | 25 GB DB | 8192 MB RAM | Mode: litestream
PRAGMA page_size = 4096;
PRAGMA journal_mode = WAL;
PRAGMA synchronous = NORMAL;
PRAGMA busy_timeout = 3000;
PRAGMA cache_size = -2097152; -- 2048 MiB page cache (negative = KiB)
PRAGMA mmap_size = 4294967296; -- 4 GiB zero-copy OS mmap
PRAGMA wal_autocheckpoint = 0; -- Managed by replicator daemon
PRAGMA journal_size_limit = 67108864; -- 64 MiB post-checkpoint WAL cap
PRAGMA temp_store = MEMORY;
PRAGMA foreign_keys = ON;

-- Acquire write lock upfront so busy_timeout queues writers without SQLITE_BUSY upgrades:
BEGIN IMMEDIATE TRANSACTION;
-- [application INSERT / UPDATE statements]
COMMIT;

# /etc/litestream.yml (Continuous 1s WAL Streaming)
dbs:
  - path: /var/lib/sqlite/app.sqlite3
    monitor-interval: 1s
    checkpoint-interval: 1m
    min-checkpoint-page-count: 1000
    max-checkpoint-page-count: 10000
    replicas:
      - type: s3
        bucket: sqliteedge-wal-archive
        path: prod/app.sqlite3
        endpoint: https://s3-minio.yourdomain.internal
        force-path-style: true
        sync-interval: 1s
        snapshot-interval: 6h
        retention: 168h

SQLiteEdge Memory Allocation: cache_size = 2048 MiB (-2097152 KiB) · mmap_size = 4 GiB · busy_timeout = 3000 ms.
Minimum Disk Guard: 73 GB local PCIe NVMe (2.3x multiplier on 25 GB DB + 64 MiB WAL cap & VACUUM INTO scratch).
Spec-Matched Host Profile: Hostinger — KVM 2 (2 vCPU / 8GB RAM / 100GB NVMe) ($5.99/mo public rate 2026-11-12) + $6/mo flat MinIO slice for 1s Litestream S3.

Inspect Hostinger (KVM 2 (2 vCPU / 8GB RAM / 100GB NVMe)) Specs via SQLiteEdge →

SQLiteEdge Public Local-NVMe & S3 Storage Pricing Matrix (Retrieved 2026-11-12)

Our SQLiteEdge comparison matrix cites publicly listed hardware specifications and starting rates retrieved 2026-11-12 from official vendor pricing pages; promotional and renewal prices may change — always verify on the vendor official checkout page.

Vendor & Infrastructure Tier	CPU Clock & Storage Bus Spec	SQLite WAL & Litestream Role	Public Rate (2026-11-12)	Official Pricing URL & Partner Route
Hostinger AMD EPYC Local NVMe KVM VPS Best $4.99–$10.49 AMD EPYC Gen4 NVMe KVM for PocketBase, Dokploy & Rails 8 Kamal + Extra Partner Discount	AMD EPYC Dedicated KVM Slices (1 – 8 vCPU) Local PCIe Gen4 NVMe (~0.11ms fsync, Zero Network-Block Tax)	PocketBase 100k Users, Node/Bun better-sqlite3 SaaS, Kamal Single-Box	$4.99/mo Retrieved 2026-11-12	`https://www.hostinger.com/vps-hosting` Check Hostinger SQLite WAL Plans via SQLiteEdge →
Vultr 3.5GHz+ High Frequency Local NVMe Compute 3.7GHz+ Single-Core IPC + Direct PCIe NVMe • ~0.045ms fsync for Peak SQLite Single-Writer TPS	3.5 GHz – 4.2 GHz High-Frequency Xeon / EPYC Direct-Attached Local Enterprise NVMe (~0.045ms fdatasync)	High-TPS SQLite WAL, LibSQL sqld Primary, Rails 8 SolidQueue Heavy Writes	$6/mo Retrieved 2026-11-12	`https://www.vultr.com/pricing/` Check Vultr SQLite WAL Plans via SQLiteEdge →
UltaHost Dedicated-Core RAID-10 NVMe VDS (Unmetered) Dedicated CPU Cores (Zero Noisy-Neighbor Steal) + Unmetered LiteFS / sqld Replica Sync Bandwidth	Dedicated Enterprise Cores (Zero Hypervisor Steal) Hardware RAID-10 Enterprise NVMe + Unmetered Traffic	250GB+ Large SQLite Datasets, High-Bandwidth LiteFS / sqld Multi-Node Clusters	$37.50/mo Retrieved 2026-11-12	`https://ultahost.com/vds-hosting` Check UltaHost SQLite WAL Plans via SQLiteEdge →
InterServer $6 Price-Lock S3 / MinIO Litestream Backup Slice $6/mo Lifetime Price-Lock 1TB Slice • $0 S3 PUT API Fees for 1-Second Litestream WAL Streaming	KVM Storage Slice + ZFS / RAID Redundancy 1 TB – 10 TB Bulk Storage ($0 Per-PUT API Request Surprises)	Self-Hosted MinIO / Garage S3 Endpoint for Continuous Litestream & ZSTD Snapshots	$6/mo Retrieved 2026-11-12	`https://www.interserver.net/vps/` Check InterServer SQLite WAL Plans via SQLiteEdge →
ChemiCloud LiteSpeed NVMe Static Frontend & Docs Edge Offload Marketing & Static Assets on Singapore/Tokyo NVMe Edge While PocketBase Runs Lean	LiteSpeed Enterprise HTTP/3 Edge Pure NVMe Flash + Cloudflare CDN Integration	Static Astro/Next Export Companion for Single-Binary API Backends	$2.95/mo Retrieved 2026-11-12	`https://chemicloud.com/wordpress-hosting` Check ChemiCloud SQLite WAL Plans via SQLiteEdge →

SQLiteEdge Official SQLite 3.46 PRAGMA Parameter Reference

How our SQLiteEdge equations map official sqlite.org/pragma.html directives onto 64-bit Linux NVMe virtual servers.

SQLite PRAGMA Directive	Stock Default	SQLiteEdge Formula / Target	Documented WAL & Memory Behavior
`PRAGMA journal_mode = WAL;`	DELETE (rollback journal)	`WAL (persistent database header)`	Separates concurrent SELECT readers from the single serialized writer by appending mutations to a sequential -wal file (sqlite.org/wal.html).
`PRAGMA synchronous = NORMAL;`	FULL (2)	`NORMAL in WAL (optional FULL for strict ledgers)`	Skips per-transaction disk barriers in WAL mode while syncing -wal frames prior to checkpoints; preserves consistency across process crashes.
`PRAGMA mmap_size = <bytes>;`	0 (disabled)	`min(DB bytes, 50% VPS RAM, 32 GiB) or 0 on LiteFS`	Maps database pages directly into the process address space to avoid read() syscall copies; disabled on FUSE filesystems like LiteFS.
`PRAGMA cache_size = -<KiB>;`	-2000 (~2 MiB)	`-(VPS_RAM_MiB * 0.25 * 1024)`	Negative value sets the per-connection SQLite page heap limit in kibibytes for unmapped or dirty B-tree pages.
`PRAGMA busy_timeout = 5000;`	0 ms (immediate SQLITE_BUSY)	`3000 ms – 8000 ms (scaled by Write QPS)`	Instructs contending writers using BEGIN IMMEDIATE to sleep and retry cleanly before returning SQLITE_BUSY.
`PRAGMA wal_autocheckpoint;`	1000 pages (~4 MiB)	`0 (Litestream/LiteFS) or 2000–4000 (Standalone)`	Controls automatic passive checkpoints; set to 0 when an external WAL shipping daemon coordinates checkpoint windows.
`PRAGMA journal_size_limit;`	-1 (unbounded -wal file)	`67108864 (64 MiB) or 134217728 (128 MiB)`	Truncates the on-disk -wal file back to a bounded ceiling after every completed checkpoint or reset.
`PRAGMA temp_store = MEMORY;`	DEFAULT (0 / disk temp files)	`MEMORY (2)`	Keeps transient ORDER BY, GROUP BY, and CTE B-trees in RAM rather than writing temporary scratch files to NVMe.

SQLiteEdge Archive Directory: Stack Blueprints, Cloud Audits & Methodology

Explore all 8 SQLiteEdge stack blueprints, 4 storage/BaaS cost comparisons, and our full formula methodology: /en/stacks/ · /en/compare/ · /en/methodology/.

SQLiteEdge Stack Blueprints (8 Production Guides)

BP-01 · SQLite WAL Production PRAGMAs: Zero SQLITE_BUSY at 20,000+ RPSSQLiteEdge PRAGMA reference: why default SQLite settings choke at 80 concurrent requests, and the 8 WAL + mmap_size rules for local NVMe VPS servers.
BP-02 · PocketBase for 100,000+ Active Users on a $10.49 AMD EPYC NVMe VPSSQLiteEdge PocketBase blueprint: sizing vCPU, LimitNOFILE descriptors, Realtime SSE streams, and Litestream systemd wrappers on a single NVMe VPS.
BP-03 · Litestream Continuous S3 Replication Without Surprise AWS PUT API BillsSQLiteEdge Litestream guide: how shadow read locks ship LZ4-compressed WAL frames every second and why a $6/mo MinIO slice avoids metered S3 PUT fees.
BP-04 · Rails 8 + SolidQueue, SolidCache & SolidCable on Kamal 2 NVMe VPSSQLiteEdge Rails 8 blueprint: isolating primary, queue, cache, and cable .sqlite3 WAL files on one Kamal 2 NVMe host to eliminate managed Redis.
BP-05 · Bun:sqlite & Node.js better-sqlite3: Why Synchronous Beats Async Pools at 25k RPSSQLiteEdge JS/TS concurrency blueprint: how synchronous better-sqlite3 and bun:sqlite avoid TCP N+1 round-trips using 4ms transaction micro-batching.
BP-06 · Self-Hosted LibSQL (sqld): Turso HTTP/Hrana & Embedded Replicas Without Row FeesSQLiteEdge LibSQL blueprint: running open-source Rust sqld behind serverless edge functions with embedded read replicas and bottomless S3 backups.
BP-07 · Local PCIe NVMe vs AWS EBS gp3: Why Network fsync Kills SQLite ThroughputSQLiteEdge storage architecture guide: why iodepth=1 network block latency throttles single-writer SQLite WAL commits and how to verify local PCIe NVMe with fio.
BP-08 · Multi-Tenant Database-Per-User SQLite: Unlimited Horizontal Write Scaling on One VPSSQLiteEdge multi-tenant blueprint: assigning each customer workspace an isolated .sqlite3 WAL file with an LRU handle pool and lazy PRAGMA user_version migrations.

SQLiteEdge Storage & Cloud TCO Audits (4 Comparisons)

CMP-01 · Vultr 3.5GHz+ High Frequency NVMe vs AWS EC2 + EBS gp3 for SQLite WALSQLiteEdge architecture and public pricing comparison (retrieved 2026-11-12): how direct PCIe NVMe avoids AWS EBS network storage latency on serialized SQLite WAL commits.
CMP-02 · PocketBase on $10.49 NVMe KVM vs Supabase Pro & Firebase Firestore at 100k MAUSQLiteEdge public tariff audit (retrieved 2026-11-12) comparing metered MAU auth and document-read billing against a self-hosted Go + SQLite WAL binary.
CMP-03 · Self-Hosted LibSQL (sqld) vs Managed Turso Cloud: Row-Read & Write Break-EvenSQLiteEdge FinOps model (public pricing retrieved 2026-11-12): evaluating when managed Turso fits vs when unindexed scans justify self-hosted sqld on local NVMe.
CMP-04 · SQLite 3.46 WAL vs Single-Node PostgreSQL 17: Honest Engineering TradeoffsSQLiteEdge architectural comparison: when zero-IPC in-process SQLite WAL excels on small NVMe VPS nodes—and the exact concurrency boundary where PostgreSQL 17 wins.
SQLiteEdge Deterministic PRAGMA & Cost MethodologyExact equations for negative-KiB cache_size, mmap_size bounds, 2.3x NVMe headroom, and 2026-11-12 public tariffs.

SQLiteEdge Frequently Asked Questions on SQLite WAL PRAGMAs & Litestream

Why did SQLiteEdge consolidate active single-VPS guides into DokployHub?

In real deployments, a PocketBase, Rails 8 SolidQueue, or LibSQL SQLite WAL database shares VPS RAM and disk bandwidth with Caddy/Traefik, Docker build layers, and background workers. We consolidated active multi-service PaaS sizing into DokployHub (https://dokployhub.pages.dev) and kept the SQLiteEdge PRAGMA generator online as a non-indexed technical archive.
How does SQLiteEdge calculate negative-KiB PRAGMA cache_size vs PRAGMA mmap_size?

Per official SQLite 3.46 documentation, a negative integer in PRAGMA cache_size = -N caps the internal B-tree page heap in kibibytes (25% of VPS RAM in our SQLiteEdge formula, e.g., -2097152 KiB = 2048 MiB on an 8192 MB server). PRAGMA mmap_size maps up to min(DB bytes, 50% VPS RAM, 32 GiB) directly from the Linux page cache for zero-copy reads, and resets to 0 B when LiteFS FUSE is selected.
When does SQLiteEdge set PRAGMA wal_autocheckpoint = 0 for Litestream S3 streaming?

Whenever Litestream S3 or LiteFS replication is selected in the SQLiteEdge studio, wal_autocheckpoint is set to 0 so SQLite does not prematurely overwrite -wal frames before the external replicator compresses and uploads them. Litestream then triggers controlled checkpoints every 1 minute.
Does PRAGMA synchronous = NORMAL risk database corruption in SQLite WAL mode?

According to official SQLite WAL documentation, synchronous = NORMAL preserves full ACID integrity across application crashes, OOM kills, and container restarts because committed frames land immediately in the OS kernel buffer. Only a sudden physical host power loss before a checkpoint could roll back the newest few seconds of commits without corrupting the .sqlite3 file.
Why does SQLiteEdge enforce a 2.3x local NVMe disk capacity rule over raw SQLite DB size?

A 40 GB production .sqlite3 database needs headroom for bursty -wal segments (64 MiB to 128 MiB+), an online VACUUM INTO compaction copy (up to 1.0x DB size temporarily), and Linux OS packages—so our SQLiteEdge formula requires at least 2.3x DB size plus 15 GB on local PCIe NVMe.