SAP Knowledge Base Article - Preview

2555080 - update statistics with hashing generates wrong column statistics - ASE

Symptom

The "with hashing" option to update statistics can generate invalid or useless statistics.

Example (part of output from optidiag on a table that has a large number of unique values):

Step Weight Value
1 0.01127901 <= "0�����"
2 0.98871720 < "99998"
3 0.00000198 = "99998"
4 0.00000000 < "99999"
5 0.00000182 = "99999"

The result is useless as almost all values have been grouped into a single cell.


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Environment

  • SAP Adaptive Server Enterprise (ASE)
  • SAP Adaptive Server Enterprise Cluster Edition (ASE CE)
  • update statistics with hashing

Product

SAP Adaptive Server Enterprise 12.5 ; SAP Adaptive Server Enterprise 15.7 ; SAP Adaptive Server Enterprise 15.7 Cluster Edition ; SAP Adaptive Server Enterprise 16.0 ; Sybase Adaptive Server Enterprise 12.5 ; Sybase Adaptive Server Enterprise 15.0 ; Sybase Adaptive Server Enterprise 15.5 ; Sybase Adaptive Server Enterprise Cluster Edition 15.0 ; Sybase Adaptive Server Enterprise Cluster Edition 15.5 ; Sybase Adaptive Server Enterprise Cluster Edition 15.7

Keywords

 Sybase, ASEServer, SAPASE, dataserver, update statistics, hashing, optdiag, histogram   , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-SYB-ASE-CE , ASE Cluster Edition (Standalone) , Bug Filed

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