Data model
Hierarchical databases
Parent–child record trees, the original mainframe database model still running critical systems. The leading options are Apache ZooKeeper, Apache Jackrabbit and GT.M.
8 active · ordered by fit for this category, then WhichDB Score
The original coordination service: hierarchical znodes, watches and ephemeral nodes for clusters.
Apache's Java Content Repository: a hierarchical, versioned node store with search, behind many Java CMSs.
FIS's high-throughput M (MUMPS) database and compiler, behind major core-banking systems.
Open-source MUMPS/M hierarchical key-value database forked from GT.M, with SQL via Octo.
IBM's 1960s hierarchical database and transaction manager, still running bank and airline cores on z/OS.
Apache time-series database for industrial IoT with tree and table models and edge-to-cloud sync.
The dominant industrial data historian: time-series storage plus asset context for plants and grids.
Genome database system born for C. elegans in 1989, with an object-tree data model; NCBI fork still updated.
deprecated, discontinued & research · 6
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