In a multi-user environment, you need to ensure that only one user can update a specific record in an ISAM file at a time. How would you implement file locking for this purpose?
- Apply a system-level lock using operating system utilities
- Implement record-level locking using a separate lock file
- Use the COBOL LOCK clause for exclusive access
- Utilize COBOL SYNC clause for synchronization
To ensure exclusive access to a record in an ISAM file, using the COBOL LOCK clause for exclusive access is a common approach. It prevents other users from updating the same record simultaneously, avoiding data inconsistency.
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