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17 lines
1.1 KiB
Markdown
17 lines
1.1 KiB
Markdown
# What is GMA graph?
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All the [entities](entity.md) and [relationships](relationship.md) are stored in a graph database, Neo4j.
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The graph always represents the current state of the world and has no direct support for versioning or history.
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However, as stated in the [Metadata Modeling](../modeling/metadata-model.md) section,
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the graph is merely a derived view of all metadata [aspects](aspect.md) thus can always be rebuilt directly from historic [MAEs](mxe.md#metadata-audit-event-mae).
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Consequently, it is possible to build a specific snapshot of the graph in time by replaying MAEs up to that point.
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In theory, the system can work with any generic [OLTP](https://en.wikipedia.org/wiki/Online_transaction_processing) graph DB that supports the following operations:
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- Dynamical creation, modification, and removal of nodes and edges
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- Dynamical attachment of key-value properties to each node and edge
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- Transactional partial updates of properties of a specific node or edge
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- Fast ID-based retrieval of nodes & edges
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- Efficient queries involving both graph traversal and properties value filtering
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- Support efficient bidirectional graph traversal
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