Creating and Maintaining Database LinksChapter 3 Configuring Directory Databases 119For the list of database link configuration attributes, refer to “Database LinkConfiguration Attributes,” on page 109.Detecting Errors During Normal ProcessingYou can help protect server performance by detecting errors during the normalchaining operation between the database link and the remote server. The databaselink has two attributes which work together to determine if the remote server is nolonger responding.The first attribute, nsMaxResponseDelay, sets a maximum duration for an LDAPoperation to complete. If the operation takes more than the amount of timespecified in this attribute, the database link’s server suspects that the remote serveris no longer online.Once the nsMaxResponseDelay period has been met, the database link pings theremote server. During the ping, the database link issues another LDAP request, asimple search request for an object that does not exist in the remote server. Theduration of the ping is set using the nsMaxTestResponseDelay.nsBindRetryLimit Number of times a database link attempts to bind to theremote server. A value of zero (0) indicates that the databaselink will try to bind only once. The default value is 3 attempts.nsConnectionLife Connection lifetime, in seconds. You can keep connectionsbetween the database link and the remote server open for anunspecified time, or you can close them after a specific periodof time.It is faster to keep the connections open, but it uses moreresources. For example, if you are using a dial-up connectionyou may want to limit the connection time.A value of 0 indicates there is no limit. By default, the value isset to 0. When the value is 0 and you provide a list of failoverservers in the nsFarmServerURL attribute, the “main”server is never contacted after failover to the alternate server.The default value is 0 seconds.nsBindTimeout Amount of time, in seconds, before the bind attempt timesout. The default value is 15 seconds.nsAbandonedSearchCheckInterval Number of seconds that pass before the server checks forabandoned operations. The default value is 2 seconds.Table 3-5 Database Link Connection Management Attributes (Continued)Attribute Name Description
