The LDAP module supports the Extension for Simple Paged Results Manipulation (RFC2696) which allows LDAP clients to retrieve large search results in smaller portions (pages). However, to return one page to a client the Server has to find all records matching the search criteria, then optionally sort them; and only then it can return the requested page. In order to prevent the performance degradation caused by repetitive searches and sortings the Server may cache several such search results using its internal memory.
The caching parameters can be adjusted using the Domain Integration page in the Users realm of the WebAdmin Interface:
Size: The maximum number of cached search results.
Used: The number of currntly cached results.
Time-out: The time period since the last client retrieval of a subsequent page, after which the memory used by cached data will be released.