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The following page has been changed by RossMcDonald:
http://wiki.apache.org/cocoon/configuringLDAPTips

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  Here thanks to Francesco Chicchiricco at Sourcesense are some tips and tricks 
for configuring LDAP to perform under load
  
- * compile latest openldap with berkleyDB in the core, not as module
+  * compile latest openldap with berkleyDB in the core, not as module
- * in slapd.conf, use a hash root password, not clear text (slappasswd -h)
+  * in slapd.conf, use a hash root password, not clear text (slappasswd -h)
+  * in slapd.conf, set 'sizelimit unlimited' to avoid problems while 
retrieving data; otherwise ldapsearch results are limited up to the specified 
limit or 500 by default
+  * in slapd.conf, set 'cachesize 5000' to speed up queries (up to 5000 
entries in memory, default 1000) - see 
http://www.openldap.org/faq/data/cache/1075.html for general considerations on 
OpenLDAP caching
+  * in slapd.conf, set 'checkpoint 512 720': this is a BDB directive telling 
OpenLDAP to set transactional checkpoint  (writing of changed  data to disk) to 
occur when either 512 kilobytes of data have been written to the bdb subsystem 
or 720 minutes have passed since the last checkpoint; this setting was very 
very important importing 23 GB of data!