transaction-correctness

Explain Turso WAL, commits, and checkpointing for transactional correctness.

23.8k|1.2k|Updated Aug 26, 2023

Search Tags:#database #concurrency #checkpointing #transactions #recovery #wal #durability

Ready to run

npx skills add https://github.com/tursodatabase/turso --skill transaction-correctness

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: transaction-correctness
Source: https://github.com/tursodatabase/turso/tree/main/.claude/skills/transaction-correctness
Command: npx skills add https://github.com/tursodatabase/turso --skill transaction-correctness

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Turso's transaction correctness guide explains how WAL, checkpointing, and recovery ensure durable, consistent state across crashes and concurrent access, clarifying how writes are logged and later applied.

Core Features & Use Cases

WAL-based durability: writes are appended to a log and committed in a controlled manner.
Checkpoint variants: PASSIVE, FULL, RESTART, TRUNCATE to balance performance and consistency.
Recovery and consistency: crash recovery replays valid commits to restore a consistent snapshot.

Quick Start

Review the guide to understand how WAL-driven durability and recovery work in Turso.

Frequently Asked Questions about transaction-correctness

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How does database crash recovery work with WAL?▼

Turso ensures transactional correctness and durability by appending database writes to a write-ahead log (WAL) and committing them in a controlled manner. This WAL mechanism guarantees that logged writes are safely persisted before being applied to the main database.

What is the difference between PASSIVE, FULL, RESTART, and TRUNCATE checkpointing?▼

Checkpoint variants like PASSIVE, FULL, RESTART, and TRUNCATE differ in how aggressively they transfer WAL frames back to the main database and manage subsequent read/write access. These checkpoint types balance performance and consistency during concurrent database operations.

How do I handle read and write concurrency during database transactions?▼

You handle read and write concurrency by relying on Turso's per-connection and shared state management alongside WAL checkpointing. This ensures snapshot consistency and isolate concurrent operations without corrupting the database state during active transactions.

When should I use different checkpoint types for database durability?▼

You should use different checkpoint types like PASSIVE, FULL, or TRUNCATE based on your system's need to balance performance and consistency. PASSIVE allows active transactions to continue, while FULL, RESTART, and TRUNCATE enforce stricter WAL frame transfer rules for crash recovery.

Does Turso support snapshot consistency for concurrent database access?▼

Yes, Turso supports snapshot consistency for concurrent database access by managing per-connection and shared state through its WAL mechanism. This ensures that concurrent reads and writes maintain a consistent view of the database even during active checkpointing.