•For ZDB methods, backup mode is required for the short period of the data replication process only (several seconds). Normal database operation can then be resumed for the rest of the backup process.

In some cases, transaction logs may also have to be backed up to allow a consistent database to be restored.

See also zero downtime backup (ZDB), and offline backup.

online redo log

(Oracle specific term) Redo logs that have not been archived,

 

but are either available to the instance for recording database

 

activity or are filled and waiting to be archived or reused.

 

See also archived redo log.

OpenSSH

A set of network connectivity tools used to access remote

 

machines securely, by using a variety of authentication and

 

encryption methods. It needs to be installed and configured on

 

the Installation Server and the client if you perform remote

 

installation using secure shell.

Oracle Data Guard

(Oracle specific term) Oracle Data Guard is Oracle’s primary

 

disaster recovery solution. Oracle Data Guard is able to

 

maintain up to nine standby databases, each of which is a

 

real-time copy of the production (primary) database, to protect

 

against corruptions, data failures, human errors, and disasters.

 

If a failure occurs on the production (primary) database, then

 

a failover to one of the standby databases which becomes the

 

new primary database is possible. In addition, planned

 

downtime for maintenance can be reduced because the

 

production processing can be moved from the current primary

 

database to a standby database and back quickly.

Oracle instance

(Oracle specific term) Each installation of an Oracle database

 

on one or more systems. One computer system can have several

 

instances of a database running.

ORACLE_SID

(Oracle specific term) A unique name for an Oracle Server

 

instance. To switch among Oracle Servers, specify the desired

 

ORACLE_SID. The ORACLE_SID is included in the CONNECT

 

DATA parts of the connect descriptor in a TNSNAMES.ORA file

 

and in the definition of the TNS listener in the LISTENER.ORA

 

file.

original system

The system configuration backed up by Data Protector before

 

a computer disaster hits the system.

380Glossary