jankotek/mapdb

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

5049 stars · 877 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

MapDB is an embedded Java database engine that provides concurrent Maps, Sets, Lists and Queues backed by disk storage or off-heap memory. It combines the Java collections framework with database features like transactions, MVCC and incremental backups.

Use cases

• store large Java collections on disk instead of heap
• replace an RDBMS with an embedded database in a Java app
• build a multilevel cache with expiration and disk overflow
• create off-heap collections not affected by garbage collection
• process and filter huge quantities of data locally
• persist a ConcurrentMap between application restarts

When to choose

• you need an embedded, zero-administration database inside a JVM application
• your datasets exceed heap memory and you want off-heap or disk-backed collections
• you want a drop-in replacement for Java Maps, Sets or Queues with persistence
• you need transactions and MVCC without running a separate database server

When to avoid

• you need a client-server database with multi-application access
• your project is polyglot and needs non-JVM clients
• you require SQL queries and rich relational features
• you need a distributed or replicated database across nodes

Facets

library · maturity stable

database caching serialization concurrency databases developer-tools performance jvm cross-platform embedded-database off-heap-memory java-collections disk-storage mvcc

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