Re: (ITS#7657) Alias dereferencing with MDB slow compared with BDB

[Mark.Cairney@ed.ac.uk]

Hi Quanah,

I've transferred one of the nodes to back-hdb and the performance 
appears to broadly match back-bdb.

Is there a simple test I can perform to confirm that it is indeed using 
back-hdb?

For completeness here's the result of my timed search:

bash-4.1$ time ldapsearch -H ldaps://rowan.authorise.is.ed.ac.uk:636 -b 
'ou=staff,ou=law,ou=hss,dc=authorise,dc=ed,dc=ac,dc=uk' -a always 
"(&(eduniSchoolCode=S26)(eduniCategory=101)(eduniIDStatus=300))"

# numResponses: 425
# numEntries: 424

real	0m0.902s
user	0m0.054s
sys	0m0.025s


On 08/08/13 16:45, Quanah Gibson-Mount wrote:
> --On August 8, 2013 4:34:32 PM +0100 Mark Cairney
> <Mark.Cairney@ed.ac.uk> wrote:
>
>
>>> back-bdb or back-hdb?  "BDB" is just the storage database for those two
>>> backends.
>>
>>
>> back-bdb.
>
> Thanks.  I would note that back-mdb is based on back-hdb, and that can
> have significant differences in performance profile for some operations
> as compared to back-bdb.  If it were possible, I'd be curious to know if
> you see the same issue with back-hdb as you do with back-mdb.
>
> --Quanah
>

-- 
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Mark Cairney
ITI UNIX Section
Information Services
University of Edinburgh

Tel: 0131 650 6565
Email: Mark.Cairney@ed.ac.uk

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