Substring search indexes are based on trigraphs aka combinations of three letters. So for
example, "search" would be broken down to:
"sea"
"ear"
"arc"
"rch"
This is because 1 and 2 letter indexes were considered "too costly" to maintain
when these were originally added.
On 27 Feb 2021, at 08:49, Chase Miller <chasejmiller(a)gmail.com>
wrote:
Why is a one letter wildcard search not hitting the index?...yet if you add two or more
letters to the wildcard, the index is used. Yes cn does have 3 indexes on it.
Example
26/Feb/2021:16:33:51.189998029 -0600] - NOTICE - ldbm_back_search - Unindexed search:
search base="cn=users,o=Xxxxxx,O=Xxxx" scope=1 filter="(cn=a*)" conn=3
op=18
Yet if the filter is ab* it uses the index
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Sincerely,
William Brown
Senior Software Engineer, 389 Directory Server
SUSE Labs, Australia