hi, what is the appropriate way to perform setup & teardown of datomic databases when using datomic cloud? I am using mount and creating a {:db-name "my-db-test"} before testing facts with midje and when it finishes I have a function call to d/delete-database which seems perfect fine for me. However, very often I got an error in the subsequent tests saying:

#error {
repl_1           |  :cause :db.error/db-deleted 463c4ecf-0733-4afd-a41a-16449265372a has been deleted
repl_1           |  :data {:datomic.client-spi/context-id cc5b3341-b4c8-40e9-8cb6-2c7b1fec2f4d, :cognitect.anomalies/category :cognitect.anomalies/fault, :cognitect.anomalies/message :db.error/db-deleted 463c4ecf-0733-4afd-a41a-16449265372a has been deleted, :dbs [{:database-id 463c4ecf-0733-4afd-a41a-16449265372a, :t 108, :next-t 109, :history false}]}

I have a retry logic for that, but it seems not alright and very often the max-retries is reached.

We are hitting the limit of the 4kb bytes per string value in datomic. What are the limitations/consequences of transacting datoms with, say an 8kb string?

By hitting the limit, I mean our users really want to store bigger text fields. I’m trying not to have to build something that splits the string it and combines it when querying. We already treat the string as opague (it’s gzipped and base64Encoded before it goes into datomic)

@dmarjenburgh since you already treat it as opaque, it wouldn't be a big stretch to store it elsewhere

[:db/add e a (content-hash text)]

then store the text somewhere else, keyed by content-hash

I'm trying to avoid that to keep latency down and the application simpler. I'm wondering why the limit exists.

If we are already subscribed to Datomic Cloud, do we need to go through the marketplace interface to create a new system? Can we just create the system directly in Cloud Formation using the appropriate templates?

Looks like yes according to the first line here https://docs.datomic.com/cloud/getting-started/start-system.html

Yes, you can absolutely get the templates directly from our releases page and launch that way @calebp https://docs.datomic.com/cloud/operation/new-system.html

Thanks @marshall. That makes life easier

do rules with multiple definitions evaluate in order?

or phrased differently, do they short circuit like ORs?

They are not ors, I don't know the internals, but it is like a logic program, both branches are taken

thanks