Unit 10, Section 16: High Speed Sequential Retrieve (HSSR)

Similar to PSSR, using HSSR is not specific to databases with logical relationships.  Its purpose is to optimize sequential access of a database, including those with logical relationships, by performing anticipatory buffering. Rather than having a program need to wait for an IWAIT completion to occur for a GN call, HSSR will have already read into the buffer pool the block/CI needed by future GN calls.