Maintaining versioning consistency across multiple ontology-based databases

A system for managing versioning of ontology data across multiple object databases, comprising:

• a memory;
• one or more processors coupled to the memory and configured to perform:
• managing an ontology including a definition for each ontology entity type of a plurality of ontology entity types and a plurality of ontology entities instantiated from the plurality of ontology entity types,
• a first ontology entity of the plurality of ontology entities being represented in multiple forms respectively in a first group of object databases of a plurality of object databases,
• a current version of the first ontology entity being represented in all object databases of the first group of object databases;
• starting, at a first time, representation of a first new version of the first ontology entity in each object database of the first group of object databases;
• receiving, at a second time after the first time, a first read request to read the first ontology entity;
• determining, at the second time, that the representation of the first new version of the first ontology entity is completed in a first object database of the first group of object databases but not a second object database of the first group of object databases;
• returning the current version of the first ontology entity in response to the first read request;
• receiving, at a third time after the second time, a second read request to read the first ontology entity;
• determining, at the third time, that the representation of the first new version of the first ontology entity is completed in the first object database and a difference between the third time and the second time exceeds a threshold;
• returning the first new version of the first ontology entity in response to the second read request.

A non-transitory, computer-readable storage medium storing one or more sequences of instructions which when executed cause one or more processors to perform:

• managing an ontology including a definition for each ontology entity type of a plurality of ontology entity types and a plurality of ontology entities instantiated from the plurality of ontology entity types,
• a first ontology entity of the plurality of ontology entities being represented in multiple forms respectively in a first group of object databases of a plurality of object databases,
• a current version of the first ontology entity being represented in all object databases of the first group of object databases;
• starting, at a first time, representation of a first new version of the first ontology entity in each object database of the first group of object databases;
• receiving, at a second time after the first time, a first read request to read the first ontology entity;
• determining, at the second time, that the representation of the first new version of the first ontology entity is completed in a first object database of the first group of object databases but not a second object database of the first group of object databases;
• returning the current version of the first ontology entity in response to the first read request;
• receiving, at a third time after the second time, a second read request to read the first ontology entity;
• determining, at the third time, that the representation of the first new version of the first ontology entity is completed in the first object database and a difference between the third time and the second time exceeds a threshold;
• returning the first new version of the first ontology entity in response to the second read request.