Expert Advice

KDP_DSMAX_Approach_Max_Warning

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Situation Description

The current number of data sets opened is approaching the maximum number that is allowed, as specified in DSNZPARM DSMAX. When DSMAX is reached, data sets will be opened and closed frequently.

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Suggested Actions

For best performance, leave enough margin in your specification of DSMAX, so that frequently used data sets can remain open after they are no longer referenced. If data sets are opened and closed frequently, such as every few seconds, you can improve performance by increasing DSMAX. To reduce open and close activity, you can try reducing the number of data sets by combining tables into segmented table spaces. This approach is most useful for development or end-user systems that include a lot of smaller tables that can be combined into single table spaces.

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