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c-treeACE V10.0 Release Notes

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Improvements for Certain Long-Running Queries

The type of query shown below was found to run slower than expected in certain situations:


SELECT (TOP k) * FROM tbl WHERE x BETWEEN a AND b ORDER BY y

The default cost estimates used in choosing an execution plan have been updated to improve general performance of this type of query. Additional options are also available to further adjust costing used in this optimization.

  • TPE_MM_COMPARE_OVHD (default value is 1)
  • TPE_MM_INSERT_OVHD (default value is 250)

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