DFSMMLCT
DFSMMLCT (in source module DFSMMLC0) is a CSECT within the DL/I space management load module DFSDHDS0. Given a block in an IMS database, it calculates the block number of the bit map block that corresponds to the data block. It also calculates the offset of the bit in the bitmap that corresponds to the input block, and the number of the lowest block mapped by the next bit map.
Hints
For performance considerations for CSECT DFSMMLCT, please refer to module DFSDHDS0.
Reference Sources
More information is available in the IMS DBSOURCE Library Data Set. See your IMS systems programmer.