Error writing shmem to file filename (error). Unable to create output file filename errno=mm.Error writing filename errno=nn.
Cause
The database server detected an error in an attempt to write shared memory to filename. The first message is followed by one of the next two. Either the attempt failed because the output file could not be created or because the contents of shared memory could not be written. The error refers to the operating-system error that prompted the attempted write of shared memory to a file. The value of nn is the operating-system error.
Action
See your operating-system documentation.