pgroonga.match_escalation_threshold parameter

Summary

pgroonga.match_escalation_threshold parameter controls when match escalation is occurred.

Match escalation is auto loose search. If the number of matched records is equal or less than the threshold specified by pgroonga.match_escalation_threshold parameter, loose search is done automatically. It's match escalation.

The default threshold is 0. It means that no records are matched, loose search is done automatically.

You can disable match escalation by specifying -1.

Normally, you don't need to change this parameter. Auto loose search is useful for users.

Syntax

In SQL:

SET pgroonga.match_escalation_threshold = threshold;

In postgresql.conf:

pgroonga.match_escalation_threshold = threshold

threshold is a number value.

Usage

Here is an example to disable match escalation:

SET pgroonga.match_escalation_threshold = -1;