Attention must be paid to protecting a KSAM file's data.
Check an intrinsic's status after a call to find information about
a failed routine. The FCHECK and FERRMSG intrinsics provide error codes and messages after
an intrinsic call has failed.
Various intrinsics control file access when a file is shared
by more than one process. Locking and unlocking the file controls
access to a shared file during critical modification operations.
The item numbers 2 and 6 of the FCONTROL intrinsic ensure that data is written to the disk before
processing is allowed to continue. This protects the data from system
and software aborts that may occur between the time that data is
written to the transaction log and the time that it is actually
written to the disk. Transaction management provides automatic recovery
from system and software aborts.
Regular maintenance and file backups are needed for data protection
against hardware failures or improper processing. If index corruption
exists, files can be restored quickly through the FCOPY facility.
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