🪶 SimpleDB

SimpleDB is a lightweight key-value database written in Python from scratch. It provides persistent storage on disk and supports common operations like SET, INCR, GET, DELETE, EXISTS, CLEAR, and DROP. The database is accessible via a simple CLI and supports optional TTL key expiry, Write-Ahead Logging (WAL), and pluggable storage formats: JSON , Binary and Txt (Default).

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🚀 Features

• ✅ Key-Value store architecture
• 💾 Persistent file storage on disk
• 🖥️ Simple CLI for executing commands
• ⚡ Fast in-memory access with file sync
• 🧾 Write-Ahead Logging (WAL) for crash recovery
• ⏳ TTL (Time-To-Live) for expiring keys
• 🧮 Storage format support:
  • json: human-readable
  • binary: compact and fast
  • txt: default
• 🔐 Commands:
  • SET <key> <value> <seconds>(optional) – Insert or update a key with optional expiry time(TTL)
  • INCR <key> – Increments value of key by one
  • GET <key> – Retrieve a value by key
  • DELETE <key> – Remove a key-value pair
  • EXISTS <key> – Check if a key exists
  • CLEAR – Remove all data
  • DROP – Delete the database file permanently
  • EXIT – Exit the CLI

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🧑‍💻 Usage

▶️ Start the CLI

python db.py

More features coming soon...