id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
1433576351,I_kwDOBm6k_c5VcqOf,1880,Datasette with many and large databases > Memory use,525934,open,0,,,4,2022-11-02T18:10:27Z,2022-11-16T17:50:29Z,,NONE,,"> Datasette maintains an in-memory SQLite database with details of the the databases, tables and columns for all of the attached databases.

The above is from the docs ^. There's two problems here - the number of datasette ""instances"" in a single server/VM and the size of the database itself. We want the **opposite** of in-memory, including what happens on SQLlite - documented in https://www.sqlite.org/inmemorydb.html

From the context in https://github.com/simonw/datasette/issues/1150 - does it mean datasette is memory-bound to the size of the dataset - which might be a deal-breaker for many large-scale use cases?

In an extreme case - let's say a single server had 100 SQLlite databases, which would enable 100 ""instances"" of datasette to run, one per client (e.g. in a SaaS multi-tenant environment). How could we achieve all these goals:

1. Allow any _one_ of these 100 databases to grow to say 2Tb in size 
2. Have one datasette instance, which connects to 1 of the 100 instances, based on incoming credentials/tenant ID
3. Minimize memory use entirely - both by datasette and SQLlite, such that almost all operations are executed in real-time on-disk with little to no memory consumption per-tenant, or per-database.

Any ideas appreciated - we're looking to use this in a SaaS type of setting - many instances, single server.

@simonw great work on datasette, in general! Possibly related to https://github.com/simonw/datasette/issues/1480 but we don't want use any kind of serverless infra - this is a long-running VM/server.",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1880/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,