Google Search Appliance User Experience Guide - Manual (Page 19)

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Dynamic navigation We verify 30K documents for
public searches (for the purpose of
creating the facets) Works for secure searches as of
release 6.12; does not work for
secure searches in 6.10 and
previous releases.
Recommended only for secure
search when using ACLs for
Authorization.
We verify 10K documents for secure
searches (for the purpose of creating
the facets). If there is a high number
of concurrent requests this might
have a negative impact on system
performance.
Dynamic results
clusters Behaves as described. Dynamic result clusters work with
secure queries. Before displaying
dynamic result clusters for secure
queries, the search appliance
ensures that the user has permission
to view secure results by triggering
authorization checks. These
authorization checks might have a
negative impact on system
performance.