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DFSDHDBK

DFSDHDBK (in source module DFSGGSP0) is a CSECT within the DL/I space management load module DFSDHDS0. It is the DL/I space management interface to the DL/I buffer handler. If the dataset is VSAM it will convert the byte address of the locate request to a VSAM RBA. If it determines that the block is beyond the end of the dataset, it bypasses going to the buffer handler altogether, otherwise it will invoke buffer handler services via module DFSDVBH0.

Hints

For performance considerations for CSECT DFSDHDBK, please refer to module DFSDHDS0.

Reference Sources

More information is available in the IMS DBSOURCE Library Data Set. See your IMS systems programmer.