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PTA

Mechanism by which one Directory Server consults another to check bind credentials. Also

pass-through authentication.

PTA directory server

In pass-through authentication (PTA), the PTA Directory Server is the server that sends

(passes through) bind requests it receives to the authenticating directory server.

PTA LDAP URL

In pass-through authentication, the URL that defines the authenticating directory server, pass-

through subtree(s), and optional parameters.

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

The name of the actual entry itself, before the entry's ancestors have been appended to the

string to form the full distinguished name. Also relative distinguished name.

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.

refe rential integrity

Mechanism that ensures that relationships between related entries are maintained within the

directory.

refe rral

(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. T his forwarding process is

called a referral.

relative distinguished name

See RDN.

replica

A database that participates in replication.

replica-initiated replication

Red Hat Directory Server 8.1 Configuration and Command Reference 255

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Red-hat 8.1 Manual do Utilizador Página 255