Sun Java System Messaging Server 6.3 Administration Guide

9.3 Asynchronous LDAP Operations

Asynchronous lookups avoid the need to store an entire large LDAP result in memory, which can cause performance problems in some cases. The MTA provides the ability to perform various types of lookups done by the MTA asynchronously.

Use of asynchronous LDAP lookups is controlled by the MTA option LDAP_USE_ASYNC. This option is a bit-encoded value. Each bit, if set, enables the use of asynchronous LDAP lookups in conjunction with a specific use of LDAP within the MTA.

Table 9–11 shows the bit and value settings for the LDAP_USE_ASYNC MTA option in the option.dat file.

Table 9–11 Settings for the LDAP_USE_ASYNC MTA Option


Bit	Value	Specific Use of LDAP
0	1	`LDAP_GROUP_URL1` (`mgrpDeliverTo`) URLs
1	2	`LDAP_GROUP_URL2` (`memberURL`) URLs
2	4	`LDAP_GROUP_DN` (`UniqueMember`) DNs
3	8	`auth_list`, `moderator_list`, `sasl_auth_list`, and `sasl_moderator_list` nonpositional list parameter URLs
4	16	`cant_list`, `sasl_cant_list` nonpositional list parameter URLs
5	32	`originator_reply` nonpositional list parameter URLs
6	64	`deferred_list`, `direct_list`, `hold_list`, `nohold_list` nonpositional list parameter URLs
7	128	`username_auth_list`, `username_moderator_list`, `username_cant_list` nonpositional list parameter URLs
8	256	alias file list URLs
9	512	alias database list URLs
10	1024	`LDAP_CANT_URL` (`mgrpDisallowedBroadcaster`) outer level URLs
11	2048	`LDAP_CANT_URL` inner level URLs
12	4096	`LDAP_AUTH_URL` (`mgrpAllowedBroadcaster`) outer level URLs
13	8192	`LDAP_AUTH_URL` inner level URLs
14	16384	`LDAP_MODERATOR_URL` (`mgrpModerator`) URLs

The default value of the LDAP_USE_ASYNC MTA option is 0, which means that asynchronous LDAP lookups are disabled by default.