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This is documentation for Caché & Ensemble.

For information on converting to InterSystems IRIS, see the InterSystems IRIS Adoption Guide and the InterSystems IRIS In-Place Conversion Guide, both available on the WRC Distributions page (login required).

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FastDistinct

Enable/disable SQL DISTINCT optimization.

Synopsis

[SQL]    FastDistinct=n

Description

The value n may be 1 or 0:

  • When 1 (true) SQL queries involving DISTINCT and GROUP BY run more efficiently by making better use of indices (if available).

    Caution:

    The values returned by such queries are collated in the same way they are stored within the index. This means the results of such queries may be uppercase. This may have an effect on case-sensitive applications.

  • When 0 (false) optimization of DISTINCT queries is disabled.

Examples

FastDistinct=1

Range of Values

0 or 1. The default is 1.

Management Portal

On the page System Administration > Configuration > SQL and Object Settings > General SQL Settings, for the DISTINCT optimization turned ON setting, choose Yes (true) or No (false).

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