Efficiently ensure that an open store's schema is a superset of a provided schema #74

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opened 2020-08-06 16:54:29 +00:00 by gburd · 0 comments

gburd commented

2020-08-06 16:54:29 +00:00

(Migrated from github.com)

A typical Datomish session looks like this:

Open the store.
Transact the entire schema.
Do some work.

Transacting the entire schema through the generic transact layer is expensive: it's an exclusive write transaction, and it does a bunch of database-level work that's redundant, because everything about the schema in the DB was just loaded into memory during opening!

Instead of <transact!, then, we'd like something more like <ensure-schema!, which will immediately return if the provided schema form is already present in the known schema, and otherwise will transact as usual.

A typical Datomish session looks like this: - Open the store. - Transact the entire schema. - Do some work. Transacting the entire schema through the generic transact layer is expensive: it's an exclusive write transaction, and it does a bunch of database-level work that's redundant, because everything about the schema in the DB was just loaded into memory during opening! Instead of `<transact!`, then, we'd like something more like `<ensure-schema!`, which will immediately return if the provided schema form is already present in the known schema, and otherwise will transact as usual.