On 2/26/21 8:42 PM, William Brown wrote:
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"
Just for completeness, it is actually broken down like:
"^se
"sea"
"ear"
"arc"
"rch"
"ch$"
So "cn=a*" --> "^a", which is only two characters and is not indexed, but "cn=ab*" --> "^ab" which is indexed.
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@xxxxxxxxx> 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
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