while creating a backup with pg_dump and parallel write accesses to the database following error occured: 2014-09-24 07:46:46 ... ERROR: out of shared memory 2014-09-24 07:46:46 ... HINT: You might need to increase max_pred_locks_per_transaction.
This a new parameter introduced in PostgreSQL 9.1. This issue will be resolved by increasing "max_pred_locks_per_transaction" parameter value from default of 64 to 256 in PostgreSQL.conf file.