Could my embedded key/value datastore eventually exceed an App Engine limit?

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+1 Q:

Could my embedded key/value datastore eventually exceed an App Engine limit?

I have a BerkeleyDB key/value datastore embedded in my Google App Engine project, which does not use the Google Datastore.

When I upload the application to Google App Engine, the database will be less than 1MB.

But is it possible that, as it grows, over time it will eventually exceed an App Engine file-size limitation?

What would be the consequence of that to my running production application?

+2 A:

App Engine DataStore entity is limited to 1MB. You won't be able to save a larger entity.

Free quota for DataStore is 1 GB. If you exceed it with billing disabled, you won't be able to save new entities or enlarge existing entities. If you have billing enabled, you will be charged for additional storage.

App Engine static file limit is 10 MB. Static file can't be changed by your application, only re-uploaded or deleted by appcfg.py tool. You won't be able to upload a file larger than 10 MB.

Constantin 2009-06-14 17:55:42

So my app will not be able to update my embedded Berkeley datastore after I upload the app to App Engine? Your answer mentions the App Engine Datastore as well as static files - but I am not using either of these.

jbancroft 2009-06-14 18:36:23

@Constantin's answer correctly gives the current limits/quotas (and the single one which you can exceed by paying: the total datastore size). Your claim that you're using neither storage nor files to hold your bsddb file is simply false: there is nowhere else you could keep it in GAE. So please clarify!

Alex Martelli 2009-06-14 20:35:36

More than that - a BDB database is not going to work in production App Engine at all: It requires a C extension module that isn't available on GAE.

Nick Johnson 2009-06-14 23:13:13

Apologies and thank you for clarifying my misunderstanding.

jbancroft 2009-06-15 00:56:17

Perhaps if you explain your requirements, we can suggest an alternative? The App Engine datastore bears many design similarities to BDB.

Nick Johnson 2009-06-15 07:28:57

ansaurus

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Could my embedded key/value datastore eventually exceed an App Engine limit?

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