What is the Difference Between Switchover and Failover in Oracle Data Guard

The main difference between switchover and failover Oracle Data Guard is that Switchover requires human intervention, while failover occurs automatically without warning. In brief, switchover converts to the standby database manually while failover converts to the standby database automatically during a failure.

1. What is the difference between switchover and failover?
2. How do you failover in Oracle Data Guard?
3. What is a DB failover?
4. What is fast start failover in Oracle Data Guard?
5. How do you use DR drill in Oracle?
6. How do I switch from primary to standby database using Dgmgrl?
7. What is fast failover?
8. What is Oracle FSFO?
9. How do I change from primary to standby database?
10. What is the difference between failover and high availability?
11. What is a failover test?
12. What is considered high availability?

What is the difference between switchover and failover?

A switchover is a role reversal between the primary database and one of its standby databases. ... A failover is when the primary database (all instances of a RAC primary database) fails and one of the standby databases is transitioned to take over the primary role.

How do you failover in Oracle Data Guard?

Performing failover :

Step 1: Check Standby Database role. Step 2: Apply the following command to finish database recovery. SQL> alter database recover managed standby database finish; Database altered. Step 3: Use the following command to activate standby database to a primary.

What is a DB failover?

Failover, or also referred to by many as Activation of the standby database, is a process when you open the standby database read/write - this can be performed if a disaster has happened and your primary database is not accessible to your users, or for some reason became corrupt.

What is fast start failover in Oracle Data Guard?

Fast-Start Failover is a feature that allows the Oracle Data Guard broker to failover a failed primary database automatically to a predetermined standby database. This feature increases the availability of the database by eliminating the need for DBA involvement as part of the failover process.

How do you use DR drill in Oracle?

DR Drill in Manual standby Database by manual log shipping

1. 1) Login into the Production Application Server and stop application services. ...
2. 3) Login as SYSDBA and transfer all the archived logs to DR Database server, and it should be in sync,by doing the log shipping activity from production to standby DB.

How do I switch from primary to standby database using Dgmgrl?

Data Guard switchover with dgmgrl

1. Ensure SPFILE is used. ...
2. Verify dmon process is running and broker parameters viz. ...
3. Check if LOCAL_LISTENER is set(This is needed only if you are non-default port other than 1521) ...
4. Verify if GLOBAL_DBNAME in listener.ora is set correctly to. ...
5. Verify if START_OPTIONS is set to MOUNT in the OCR.

What is fast failover?

Fast failover is a new feature that improves the failover time for the storage stack configured in a clustered environment. ... These changes provide significant reduction in the failover time taken by storage resources during service group failovers.

What is Oracle FSFO?

Fast Start Failover is a feature available through oracle dataguard broker which performs an automatic failover to the chosen standby database in case of a primary database crash. FSFO involves an OBSERVER component which runs on a different machine than that of the primary and the standby database.

How do I change from primary to standby database?

Switchover to Physical Standby Database in Oracle 11g

1. Step 1 : Verify whether it is possible to perform a switchover. ...
2. Step 2 : Check that there is no active users connected to the databases. ...
3. Step 3 : Switch the current online redo log file on primary database and verify that it has been appleid.

What is the difference between failover and high availability?

Failover is a means of achieving high availability (HA). Think of HA as a feature and failover as one possible implementation of that feature. Failover is not always the only consideration when achieving HA. ... Requiring more nodes to respond means less availability, and requiring fewer nodes means more availability.

What is a failover test?

Failover testing is a testing technique that validates a system's ability to be able to allocate extra resource and to move operations to back-up systems during the server failure due to one or the other reasons.

What is considered high availability?

High Availability (HA) describes systems that are dependable enough to operate continuously without failing. They are well-tested and sometimes equipped with redundant components. ... High availability refers to those systems that offer a high level of operational performance and quality over a relevant time period.