October 2011
Intermediate to advanced
510 pages
18h 48m
English
book
IBM IMS Version 12 Technical Overview
by Paolo Bruni, Isabelle Bruneel, Angie Greenhaw, Dougie Lawson, Jorge Alberto Luz Ribeiro, Egide Van Aershot
Content preview from IBM IMS Version 12 Technical Overview
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Chapter 2. System enhancements 47
The maximum WADS size was (OLDS block size/WADS segment size) + 1) x (number of
OLDS buffers) tracks. For example, an installation defined with 200 OLDS buffers of 24 K size
above the bar used a WADS with 1400 tracks. With IMS 12, it requires no more than enough
tracks to hold 200 x 24 K plus one track, which is approximately 101 tracks.
In previous versions of IMS, the WADS was written in segments from the OLDS buffers.
Successive writes were to different tracks. The scheme is much simpler in IMS 12. Each
WADS write is to the next block in the data set. The data written to the WADS includes the
data that was not previously written up to the last record in the buffer.
2.5.5 Considerations for IMS logger
This ...
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