fsdb

A MySQL-compatible database server in idiomatic F#. It speaks the MySQL wire protocol, so clients such as mysql, PDO, and MySqlConnector connect without an fsdb-specific adapter. Internally, a query follows one readable pipeline: bytes → command → AST → logical plan → lazy seq.

MySQL 8.4 is the compatibility oracle; SQLite is not. Readable F# is the primary design constraint, ahead of raw performance. The default server is in-memory, with an opt-in binary WAL and snapshots for durable use. The compatibility guide explains how behavior is validated; GAPS.md is the live ledger of known differences.

Contents

• Quick start
• Configuration
• Security and deployment
• How it works
  • Parser
  • Engine
  • Collations and charsets
  • Prepared statements
• SQL surface
• Persistence format
  • Write-ahead log
  • Snapshots -…