Glossary 81
PTA LDAP URL
In pass-through authentication, the URL that defines the authenticating directory server, pass-
through subtree(s), and optional parameters.
R
RAM
Random access memory. The physical semiconductor-based memory in a computer. Information
stored in RAM is lost when the computer is shut down.
rc.local
A file on UNIX machines that describes programs that are run when the machine starts. It is also
called /etc/rc.local because of its location.
RDN
Also Relative Distinguished Name. The name of the actual entry itself, before the entry’s ances-
tors have been appended to the string to form the full distinguished name.
referential integrity
Mechanism that ensures that relationships between related entries are maintained within the di-
rectory.
referral
(1) When a server receives a search or update request from an LDAP client that it cannot process,
it usually sends back to the client a pointer to the LDAP sever that can process the request.
(2) In the context of replication, when a read-only replica receives an update request, it forwards
it to the server that holds the corresponding read-write replica. This forwarding process is called
a referral.
replica
A database that participates in replication.
read-only replica
A replica that refers all update operations to read-write replicas. A server can hold any number
of read-only replicas.
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