Red Hat DIRECTORY SERVER 7.1, Руководство администратора, Страница: 629 / 652

Glossary 629
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
ancestors 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 directory.
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.
read-write replica A replica that contains a master copy of directory information and can be
updated. A server can hold any number of read-write replicas.
relative distinguished name See RDN .
replication Act of copying directory trees or subtrees from supplier servers to consumer servers.
replication agreement Set of configuration parameters that are stored on the supplier server and
identify the databases to replicate, the consumer servers to which the data is pushed, the times
during which replication can occur, the DN and credentials used by the supplier to bind to the
consumer, and how the connection is secured.
RFC Request for Comments . Procedures or standards documents submitted to the Internet
community. People can send comments on the technologies before they become accepted
standards.
role An entry grouping mechanism. Each role has members , which are the entries that possess the
role.