To build something like Google Groups, because the posts can cross the 4096 character limit Datomic strings have, how/where would you store these?

in another database

in datomic you save the reference

on-prem doesn't mention this limit but I have heard long strings make on-prem slow, maybe that's why they set a limit in cloud

like S3?

like postgres, dynamo, or some other key-value store

s3 should work too I suppose but a database seems more fit for your use case

I’m working on a thing for my writing and am thinking of using S3

it’s cheap and reasonably fast

what JDK version do Datomic cloud instances (most recent, 454-8573) use?

will datomic peers use memcached even if the transactor isn't?

I added "memcached=server:port" to a datomic pro starter cloudformation template, and based on memcached stats (bytes/cur_connections) I think it's using it correctly, but it hasn't added any new metrics to cloudwatch

yes they will

donno about metrics