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Subsystem and Transaction Monitoring and Tuning with DB2 11 for z/OS by Yasuhiro Ohmori, Cathy Drummond, Adrian Burke, Felipe Bortoletto, Paolo Bruni

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Data set open and close
Having the needed data sets open and available for use is important for the performance of transactions. However, the number of open data sets affects the amount of available storage, and the number of open data sets in read/write state affects restart time.
This chapter contains the following topics:
6.1 Open and close data sets
Opening needed data sets for table spaces and indexes, and keep them available for use is important for the performance ...

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