HP B6960-96035, Руководство по концепциям

Страница: 380 / 422

• 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online redo log (Oracle specific term) Redo logs that have not been archived,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.
Glossary 380