in the new application server configuration, there are mentioned two JCA related thread pools: short running and long running. Is there any documentation which explains which service use one or another ?
In particular, I'd like to increase the pool of threads used as inflow for database connections, however tweaking with both JCA pools seem not produce any result.
These thread pools are used for the JCA WorkManager - for short running jobs and long running jobs (see JCA 1.6 specification). If you leave out the long running thread pool those jobs will use the short running one.
You must mean the pool size for database connection - see the <pool> or <xa-pool> elements in the configuration.