Thank you again, I have another question in order to make sure I have a clear understanding: > On 4 Aug 2020, at 11:24, Ian Lawrence Barwick <barwick@xxxxxxxxx> wrote: > > The hash table is specific to each running backend so will only be > accessed by that process. > > Pre-loading a shared library just gives the library an opportunity to > set up shared memory etc. You can always try adding one of the FDW > libraries to "shared_preload_libraries" and see what happens > (theoretically nothing). > My impression was that since each client (e.g. libpq) connection results in the creation of a Postgres process in the backend (https://www.postgresql.org/developer/backend/) then this (mysql) "connection pool" hash table is not global per se and shared among the different client / users sessions. But that defeats the purpose, no? Thank you Best Stelios
