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A common scenario we come across with almost all metadata repositories we have seen is that they lack the ability to store historical information about metadata and respond to point-in-time inquiries. While Egeria's type system and APIs have been built from the beginning to support such history, we have not yet implemented a backend storage option that implements history.
Considering this comes up frequently as a common need, even to augment existing metadata repositories, providing such a historical store for metadata could be a somewhat narrow but nonetheless extremely common adoption point for Egeria.
We are currently considering implementation options for an initial approach to such a repository.
|Option 1: bi-temporal RDBMS||Option 2: bi-temporal graph||Option 3: search index|
|Using a bi-temporal relational database like DB2|
Using a bi-temporal graph store like Crux
|Using a search index like Elastic|
|Pros and cons|
Estimated cost and effort
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