4.2. New Index CI size calculation algorithm

Use your automation console function to detect the message in Figure 4-4, generating an alert.

Figure 4-4. Message due to index CI size too small
Unable to split index; increase index CI size

After that, carefully read this topic.

VSAM uses a default minimum value for index CI size, if it determines that the one specified by you is not large enough. The algorithm that calculates this value was changed in z/OS V1 R3.

This change was to increase the likelihood that the index CI would be large enough to hold all the keys that can exist in a data CA. In a number of situations the default value calculated was not large enough. Because of this, there was a lot ...

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