Ich hab nur ganz kurz in die Doku von DBI geschaut (10sec) und dabei folgendes gefunden. Sollte eigentlich das sein was du suchst. Vor allem sollte es dann auch unabhängig vom verwendeten DBMS sein.
Quotedata_sources
@ary = $dbh->data_sources();
@ary = $dbh->data_sources(\%attr);
Returns a list of data sources (databases) available via the $dbh driver's data_sources() method, plus any extra data sources that the driver can discover via the connected $dbh. Typically the extra data sources are other databases managed by the same server process that the $dbh is connected to.
Data sources are returned in a form suitable for passing to the "connect" method (that is, they will include the "dbi:$driver:" prefix).
The data_sources() method, for a $dbh, was added in DBI 1.38.
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