Tomas Vondra <> writes:
> why the libraries loaded using local_preload_libraries need to be placed
> in a different subdirectory than libraries loaded using
> shared_preload_libraries?

Security: it lets the DBA constrain which libraries are loadable this way.

> I do understand that leaving the users to load whatever libraries they
> want is a bad idea, but when the library is loaded from postgresql.conf
> it should be safe.

We don't have a mechanism that would allow different limitations to be
placed on a GUC variable depending on where the value came from.
To do what you're proposing would require restricting
local_preload_libraries to be superuser-only, which would be a net
decrease in functionality.

                        regards, tom lane

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