Firebird Tutorial - Monitoring
SELECT d.MON$OLDEST_TRANSACTION, d.MON$OLDEST_ACTIVE, d.MON$OLDEST_SNAPSHOT, d.MON$NEXT_TRANSACTION - 1 - d.MON$OLDEST_ACTIVE AS NB_AWAITING_GC FROM MON$DATABASE d
⇒ Renvoie le nombre de transaction “Awaiting GC”