High speed sequential processing (HSSP)

Using DBCTL enables you to use high speed sequential processing (HSSP). HSSP is useful with applications that do large scale sequential updates to DEDBs, which may require an image copy after the DEDBs are updated. Using HSSP provides the following major benefits:

• DEDB processing time can be improved by using the IBM® 3990 Storage Control Model 3 Fast Write capability and the IBM 3990 Storage Control Model 3 Sequential Mode for both READs and WRITEs.
• You can take an HSSP image copy during a sequential update job. This avoids having to make a subsequent sequential pass through the DEDB areas to take an image copy.
• HSSP reduces elapsed DEDB processing time by using private buffer pools and optimizing locking.
• Only a minimum amount of log data is written to the IMS system log when you request an HSSP image copy. This reduces the large amount of logging that such large scale sequential runs usually involve.