One of the production server of the client (ingdba1) suddenly shut down. As per checking of the Ingres error log, transaction log became full and leads the Ingres to shutdown. Possible causes are long running queries that possibly were uncommited, long DB procedures that involved unoptimized table and QSF out of memory caused by these uncommited queries. Actian recommends to double the value of qef_hash_mem  on CBF and do housekepping chores regularly.