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NN10031-111 Standard MCP 1.1 FP1 (02.02) April 2003 Copyright © 2003, Nortel Networks
Nortel Networks Confidential
while the secondary database operates in a limited write state at all
times.
Table 1 Database operational states
Database states Description
Normal
(Primary database)
Fully writable for applications. Inserts,
updates, or deletions are permitted to the
primary database. The Oracle Server
continuously transfers changed data to the
secondary database.
Limited write
(Secondary
database)
Read only for applications with the
exception of registrations (inserts, updates,
or deletions).
In the unlikely event of failure of the primary
database, applications failover to the
secondary database. During failover,
applications can read and have limited write
access to the secondary database. The
failover state continues only until the primary
database returns to service.
Note: The secondary database operates in
a limited write state for applications but is
always fully writable for Oracle replication
processes.
Quiesced
(maintenance mode)
No writes are permitted to either database.
When the database is quiesced,
applications can only query the database
and cannot insert, update, or delete
database records.
Replicated databases automatically enter
this state whenever changes are being
made to the replication environment,
including modifying replication objects and
synchronizing the two databases.