Overview#SizeLimit specifies the maximum number of entries that should be returned from the SearchRequest.
Zero (0) implies there should is no SizeLimit on the entries to be returned.
SearchRequest Setting#The SearchRequest element for SizeLimit may be more restrictive than the DSA SizeLimit setting. DSA SizeLimit is, depending on the LDAP Server Implementation a configuration option that controls the maximum number of entries that may be returned from any single SearchRequest.
Typically this is a DSA setting vs a DIT setting and depending on the LDAP Server Implementation may be overridden by a per-user configuration. That is, some LDAP Server Implementations can be configured to not enforce DSA SizeLimit limits for Administrative users.