Attention must be paid to protecting a KSAM XL 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.
