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cpu_countor 1 (one) on systems where this number is unknown. See also concurrent/3.
true, supress loading messages from rdf_attach_db/2.
true, nested log transactions are added to the journal information. By default (
false), no log-term is added for nested transactions.
The database is locked against concurrent access using a file
lock in Directory. An attempt to attach to a
locked database raises a
permission_error exception. The
error context contains a term
rdf_locked(Args), where args
is a list containing
The error can be caught by the application. Otherwise it prints:
ERROR: No permission to lock rdf_db `/home/jan/src/pl/packages/semweb/DB' ERROR: locked at Wed Jun 27 15:37:35 2007 by process id 1748