More than DB2. An IBM FAQ list says the following about MIDAW:

"Applications that use the following may benefit [from MIDAW]: DB2, VSAM, Partitioned Data Set Extended (PDSE), Hierarchical File System (HFS), z/OS File System (zFS), and other datasets exploiting striping and compression. Applications using ESCON may also experience performance improvements."
Duh, I knew that. The MIDAW support is in Media Manager, which is used by all those access methods.

--
Bruce Black
Senior Software Developer
Innovation Data Processing

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