MANAGING A DATA SET

摘要

A method of and system for managing a data set of a storage facility is disclosed. The data set may be a sequential-access data set. The method and system may include structuring the sequential-access data set to have a first group-of-records configured for adding a second group-of-records to the sequential-access data set. The method and system add a second group-of-records to the sequential-access data set. The method and system merge the second group-of-records with the first group-of-records in response to a triggering event. The method and system establish, in response to merging the second group-of-records with the first group-of-records, a marker configured to indicate the first and second group-of-records, as merged, is sorted.

主权项

1. A computer-implemented method for managing records of a sequential-access data set of a storage system, the method comprising:
sorting a first group-of-records of the sequential-access data set; updating a first field in a catalog entry of the sequential-access data set with a value indicating a record position of a last sorted record in the first group-of-records; adding a second group-of-records to the sequential-access data set after the record position of the last sorted record in the first group-of-records; updating a second field in the catalog entry with a value indicating the number of unsorted records in the second group-of-records; comparing the value in the second field to a threshold associated with a quantity-of-changes to the sequential-access data set performed by a processor since a previous sort; in response to determining that the value in the second field exceeds the threshold, sorting the second group-of-records and merging the sorted second group-of-records with the sorted first group-of-records such that, with respect to order, the first group-of-records and the second group-of-records appear as a single group; updating the first field in the catalog entry with a value indicating a record position of a new last sorted record in the merged first and second group-of-records; and resetting the second field in the catalog entry to zero after merging the second group-of-records with the first group-of-records.