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pg_tty() will return the tty name that server side debugging output is sent to on the given postgresql connection identifier.
pg_tty() returns the tty name that server side debugging output is sent to on the given postgresql connection resource.

assertion should be used as a debugging feature only. you may use them for sanity-checks that test for conditions that should always be true and that indicate some programming errors if not or to check for the presence of certain features like extension functions or certain system limits and features.
while this information can be captured via other methods, using assertions makes it much faster and easier!

enables tracing of the postgresql frontend/backend communication to a debugging file. to fully understand the results one needs to be familiar with the internals of postgresql communication protocol. for those who are not, it can still be useful for tracing errors in queries sent to the server, you could do for example grep '^to backend' trace.log and see what query actually were sent to the postgresql server.
for those who are not, it can still be useful for tracing errors in queries sent to the server, you could do for example grep '^to backend' trace.log and see what query actually were sent to the postgresql server.