What is Data Guard protection mode?
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What is Data Guard protection mode?
This protection mode provides the highest level of data protection that is possible without affecting the performance of a primary database. This is accomplished by allowing transactions to commit as soon as all redo data generated by those transactions has been written to the online log.
What is the default mode of Data Guard?
Maximum Performance : This is default Protection mode in dataguard. Unlike Maximum Availability Protection mode, this mode allows transactions to commit as soon as all redo data generated by those transactions are written to online redo log files.
How do I change Data Guard protection mode?
Use the following command to change protection mode. SQL> ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE AVAILABILITY; Database altered. Now, open database. SQL> alter database open; Database altered.
What is the use of Data Guard?
Data Guard provides an efficient and comprehensive disaster recovery and high availability solution. Easy-to-manage switchover and failover capabilities allow role reversals between primary and standby databases, minimizing the downtime of the primary database for planned and unplanned outages.
How do I know if my Active Data Guard is enabled?
If you start a database in SQL*Plus using the STARTUP command and then invoke managed recovery, the Active Data Guard will be enabled. However, if the database is started in SQL*Plus using the STARTUP MOUNT command and then managed recovery is invoked, Active Data Guard will not be enabled.
What are the background processes involved in Data Guard?
In this post let us understand the Oracle dataguard Architecture and processes with the help of diagrams. LNS process of primary database captures redo from redo log buffer. Send it to RFS process of standby database through oracle net. RFS process then writes that redo information to standby redo log files.
What is sync and async in Data Guard?
The synchronous log transport mode is required for the Maximum Protection and Maximum Availability data protection modes. LogXptMode = (‘ASYNC’): Conversely, asynchronous mode (ASYNC) allows updates (DML) to be committed on the primary server before the log file arrives on the standby servers.
What is the difference between Data Guard and Active Data Guard?
Data Guard is a feature of the Oracle Database Enterprise Edition itself and does not require separate licensing. On the other hand, Active Data Guard is a so-called Oracle Database Enterprise Edition Option and as such requires separate licensing.
How does Active Data Guard work?
Active Data Guard enables read-only access to a physical standby database while Redo Apply is active. Queries and reports can be offloaded from the production system to a synchronized physical standby database – all queries at the standby database return up-to-date results.
How do I turn off Active Data Guard?
How To Disable Active Data Guard?
- SQL> shutdown immediate;
- Database closed.
- Database dismounted.
- ORACLE instance shut down.
- SQL> startup mount;
- ORACLE instance started.
- Total System Global Area 6480490496 bytes.
- Fixed Size 2265384 bytes.
What is affirm and Noaffirm in dataguard?
AFFIRM —specifies that a redo transport destination acknowledges received redo data after writing it to the standby redo log. NOAFFIRM —specifies that a redo transport destination acknowledges received redo data before writing it to the standby redo log.
What is fast sync in Oracle Data Guard?
Fast Sync is a new Data Guard capability available with Oracle Database 12c. Fast Sync enables use of the destination parameter NOAFFIRM which specifies that the standby acknowledge receipt of redo without waiting for the write to the standby redo log file to complete.
How do you use Active Data Guard?
RMAN backups can be initiated from standby , instead of primary which will reduce cpu load from primary.
- NOTE – To use active dataguard, you need additional license from oracle.
- Open the database[PHYSICAL STANDBY]
- Start media recovery with real-time log apply[PHYSICAL STANDBY]
How do I know if my Data Guard is active?
