YottaDB
activeby YottaDB LLC · since 2017 · also known as YDB (YottaDB), YottaDB r2
Open-source MUMPS/M hierarchical key-value database forked from GT.M, with SQL via Octo.
Overview
YottaDB is a high-performance hierarchical key-value database descended from GT.M, which it forked in 2017 to develop in the open. Data lives in persistent sparse arrays (M globals) with ACID transactions, journaling and logical multi-site replication, and it serves core-banking and VistA electronic health record systems around the world. Beyond the M language it offers native APIs for C, Go, Rust, Python, Node.js, Perl and Lua, and Octo adds SQL over the PostgreSQL wire protocol. It is the go-to engine for keeping M applications alive on modern Linux.
Strengths & trade-offs
Strengths
- +Very fast in-process access to persistent hierarchical arrays
- +Decades of production use in banking and healthcare via its GT.M lineage
- +Native APIs in modern languages, not only M
- +SQL access through Octo for reporting tools
Trade-offs
- −M programming model and tooling are unfamiliar to most engineers
- −Linux-only with a small talent pool
- −No built-in sharding; scale-out is application-level
Great for
- +VistA and other M-based EHR systems
- +Core-banking platforms built on M
- +Migrating GT.M or Caché applications to open source
Think twice for
- −Greenfield apps without M heritage
- −Horizontally sharded internet-scale workloads
Capabilities
Native or official first-party support · 4 of 25 tracked
Scale & consistency
- Comfortable data size
- Medium · ≤ 10 TB
- Horizontal scaling
- Manual
- Multi-region
- Read replicas
- Transactions
- Full ACID
- Consistency
- Strong
- Schema
- Schemaless
- Architecture
- Single node, Primary replica, Embedded
- Query languages
- M (MUMPS), SQL (Octo)
Vertical scale plus logical multi-site replication for business continuity.
Deployment
Ecosystem
Alternatives to YottaDB
FIS's high-throughput M (MUMPS) database and compiler, behind major core-banking systems.
yottadb vs gt-m →Multi-model data platform (SQL, objects, globals, vectors) with built-in interoperability, big in healthcare.
yottadb vs intersystems-iris →InterSystems' MUMPS-lineage object/SQL database, superseded by IRIS and winding down maintenance.
yottadb vs intersystems-cache →The 1990s-era embedded key-value library, now Oracle-owned, AGPL-licensed and rarely updated.
yottadb vs berkeley-db →Tiny memory-mapped B+tree with ACID transactions and lock-free readers; reached 1.0 in 2026.
yottadb vs lmdb →IBM's 1960s hierarchical database and transaction manager, still running bank and airline cores on z/OS.
yottadb vs ibm-ims →YottaDB FAQ
What is YottaDB?
YottaDB is a hierarchical database by YottaDB LLC, first released in 2017. YottaDB is a high-performance hierarchical key-value database descended from GT.M, which it forked in 2017 to develop in the open. Data lives in persistent sparse arrays (M globals) with ACID transactions, journaling and logical multi-site replication, and it serves core-banking and VistA electronic health record systems around the world. Beyond the M language it offers native APIs for C, Go, Rust, Python, Node.js, Perl and Lua, and Octo adds SQL over the PostgreSQL wire protocol. It is the go-to engine for keeping M applications alive on modern Linux.
Is YottaDB open source?
Yes. YottaDB is open source. License: GNU AGPL v3.0.
Does YottaDB support ACID transactions?
Yes. YottaDB supports full ACID transactions, with strong consistency.
Does YottaDB scale horizontally?
YottaDB has no built-in sharding; scaling out means partitioning data in your application. It is comfortable at medium scale (≤ 10 TB). It supports cross-region read replicas.
How can I run YottaDB?
You can self-host it and embed it in your application.
What is YottaDB best for?
YottaDB is a strong fit for VistA and other M-based EHR systems; core-banking platforms built on M; and migrating GT.M or Caché applications to open source. Think twice for greenfield apps without M heritage.
What are the best alternatives to YottaDB?
Common alternatives to YottaDB include GT.M, InterSystems IRIS, InterSystems Caché, Oracle Berkeley DB and LMDB. The right choice depends on your workload, scale and hosting; WhichDB's smart match ranks them against your requirements.
How popular is YottaDB?
YottaDB ranks #333 of 844 databases on the WhichDB Score (7.9/100), and #5 among hierarchical databases. The score combines public adoption signals such as package downloads, GitHub activity, job posts and developer discussion.