[389-users] 389-DS poor performance retrieving groups

[ghiureai]

  Mark, would be accepted to accommodate only  substring indexes
  followed by wild char than ?
  aka :cn=abc*,
  cn=efg*  .... may need couple of this indexes.

  Thank you


  [389-users] 389-DS poor performance retrieving groups

On 08/05/2015 08:24 AM, Mark Reynolds wrote:
>/
/>/
/>/  On 08/04/2015 11:57 AM, ghiureai wrote:
/>>/  <https://www.flowdock.com/app/canfar/access-control/threads/QyygOboGumgx3qw3tIO_828AMgQ>
/>>/
/>>/  We are seeing poor performance from LDAP retrieving 2500-4500 entries
/>>/  compare with one of our regular RDBMS , here is bellow the result for
/>>/  a ldapsearch.
/>>/  We are questioning if for general cn=(.*..) search string , LDAP has
/>>/  to run  a round trip for each  subset result entry ?
/>>/
/>>/  What cfg needs tuned to  see some performance improvements beside
/>>/  cache mem size ?
/>>/
/>>/  ldapsearch -x -s one -H  -b 'ou=Groups,ou=ds,dc=cxxx,dc=net' -W -D
/>>/  'uid=xx,ou=Users,ou=ds,dc=cxxxr,dc=net' 'cn=*MT*' 'cn, nsaccountlock'
/>/  Okay so this is probably unindexed, and the requested access log
/>/  snipet will confirm this. If you see notes=U or notes=A then we can
/>/  tune the id scan limit for that search:
/>/
/>/
/>/  Assuming this is the only search that is giving you issues:
/>/
/>/  Example:
/>/
/>/
/>/  # ldapmodify <fill in the required parameters>
/>/  |dn: cn=cn,cn=index,cn=userroot,cn=ldbm database,cn=plugins,cn=config
/>/  changetype: modify
/>/  add:|||nsIndexIDListScanLimit|
/>/  nsIndexIDListScanLimit: limit=-1 type=sub values=*mt,mt*
/>/
/>/
/>/
/>/  If there are other substring searches around the "cn" attribute you are having issues with, you can modify this to be:
/>/
/>/  |# ldapmodify <fill in the required parameters>
/>/
/>/  |dn: cn=cn,cn=index,cn=userroot,cn=ldbm database,cn=plugins,cn=config
/>/  changetype: modify
/>/  add:|||nsIndexIDListScanLimit|
/>/  nsIndexIDListScanLimit: limit=-1 type=sub|
/I'm on a roll today :-( sorry so this is not going to solve the issue.
There is no way to index or improve this type of search filter's
performance (cn=*mt*).  If this is a reoccurring search filter, and your
client can be adjusted to use vlv indexes, then that might be option.
See the admin guide for more info on VLV searches/indexes.

Regards,
Mark
>/
/>



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