Before the system accesses a calendar from the calendar database, it must determine which back-end machine stores that user’s calendars. To find the appropriate back-end machine, the system searches the LDAP directory for the user’s entry and picks up the icsDWPHost attribute. This search is time consuming, and it must be performed for every access to the calendar data. Every user session can result in many accesses of the database and thus many searches of the LDAP. To save time and enhance performance, enable the CLD cache by editing the ics.conf file as follows:
The LDAP data cache stores the user ID and its associated icsDWPHost attribute. Before searching the LDAP for a user’s entry, the system checks the cache for the user’s ID. If it is in the cache, it picks up the back-end host name from the icsDWPHost attribute stored there. If it is not in the cache, the system performs the LDAP search and copies the user ID and attribute into the CLD cache. Subsequently, accesses to the user’s calendar data will be faster, since it will now find the user ID in the cache.