Abstract: An automatic tuning of the assignment of data sets of an application program to the buffer pools in the main storage is provided. Buffer pool usage statistics data are generated including a performance value for each of the data sets. The performance values of the data sets are examined for the existence of a data set reassignment criteria and a data set is reassigned to another buffer pool if a reassignment criteria is found. To determine a suitable buffer pool for receiving the data sets to be reassigned, a selection value for each of the buffer pools is generated by comparing the pool size with selected ones of the usage parameters. The selection values of the buffer pools are examined for the existence of a selection criteria that determines the buffer pool to which the data set is reassigned. The performance value examination and the data set reassignment are performed at restart time of an application program and may be repeated in predetermined time intervals during its runtime.

Abstract: In accordance with the present invention, the fastest possible one-to-one copying of data files which are to be backed up is performed from a source storage medium to a target storage medium. The data files include usable data and management data. After the copying, data held on the source storage medium is accessible to users during the backup. To perform the backup, a record table or synonym list provides access to the files which have been copied. From the record table, management data is temporarily replaced in order to meet access requirements for opening the copied data files at the target storage medium. The copied management data and useful data on the target storage medium remain unchanged. Advantageously, copied data files on the target storage medium can no longer be changed after copying and apart from the authorized backup program, no application can read the copied data files from the target storage medium.

Abstract: An automatic tuning of the assignment of data sets of an application program to the buffer pools in the main storage is provided. Buffer pool usage statistics data are generated including a performance value for each of the data sets. The performance values of the data sets are examined for the existence of a data set reassignment criteria and a data set is reassigned to another buffer pool if a reassignment criteria is found. To determine a suitable buffer pool for receiving the data sets to be reassigned, a selection value for each of the buffer pools is generated by comparing the pool size with selected ones of the usage parameters. The selection values of the buffer pools are examined for the existence of a selection criteria that determines the buffer pool to which the data set is reassigned. The performance value examination and the data set reassignment are performed at restart time of an application program and may be repeated in predetermined time intervals during its runtime.