1.9. Extended format data set
Extended format is a technique that affects the way count key data (CKD) is stored in a 3390/3380 logical track. Extended format was first introduced to implement data striping. It increases the performance and the reliability of an I/O operation.
It is recommended that you convert your data sets to extended format for better performance, additional function and improved reliability A good time to convert to extended format is when you reorganize your VSAM data set.
All VSAM data set organizations can be defined in extended format, this includes KSDS, ESDS, RRDS, VRRDS, and LDS. The benefits available to extended format data sets include”
Data striping
Data compression
VSAM extended addressability
Partial space release ...
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