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Comment by stickfigure | Hacker News Reader

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stickfigure·

The Google Cloud Datastore (formerly the "App Engine Datastore") has had cross-entity-group transactions since 2011:

https://googleappengine.blogspot.com/2011/10/app-engine-155-...

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The cross group transactions are a little limited - https://cloud.google.com/appengine/docs/standard/java/datast...

I don't think it's fair to compare them.

However, the more recent Google storage offerings based on Cloud Spanner do seem to offer this. I don't see how Amazon can make this statement - that doesn't stop it being an excellent enhancement to DynamoDB though.

I don't know if the overall statement is true, but Spanner is relational and the statement was limited to non-relational databases.

Cloud Firestore (the next generation of Cloud Datastore) removes those limitations. https://cloud.google.com/firestore/docs/manage-data/transact...

It also supports the Cloud Datastore API.

(I work on it!)

DynamoDB is limited to 10 items, whereas the Cloud Datastore limits are 25 different 'tables' -> The new version via Cloud Firestore doesn't even have that restriction. AWS is several years behind and several NoSQL systems behind in this area. Still, a cool addition.

The “and tables” clause is the differentiator, I think. DynamoDB tables are roughly equivalent to Datastore namespaces; I don’t believe Google Cloud Datastore supports cross-namespace transactions.

It does, and has for several years.

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