What is the Difference Between Logical and Physical Standby Database in Oracle

Logical standby is different from physical standby: Logical standby database does not have to match the schema structure of the source database. Logical standby uses LogMiner techniques to transform the archived redo logs into native DML statements (insert, update, delete).

1. What is logical standby database?
2. What is physical standby database in Oracle?
3. What is the difference between physical standby and active data guard?
4. What is snapshot standby database?
5. How do I start a logical standby database?
6. What is the difference between Data Guard and GoldenGate?
7. How do I know if my database is primary or standby?
8. How do I start a physical standby database?
9. What is physical and logical standby database?
10. How do I know if my Active Data Guard is enabled?
11. What is Active Data Guard in Oracle?
12. What is Active Data Guard in Oracle 11g?

What is logical standby database?

Logical standby databases

A logical standby database is kept in sync with the primary by transforming redo data received from the primary into logical SQL statements and then executing those SQL statements against the standby database. ... Ability to offload reporting from the primary database.

What is physical standby database in Oracle?

A physical standby database is an exact, block-for-block copy of a primary database. A physical standby is maintained as an exact copy through a process called Redo Apply, in which redo data received from a primary database is continuously applied to a physical standby database using the database recovery mechanisms.

What is the difference between physical standby and active data guard?

Difference between Dataguard and Active Dataguard. ... Oracle Active Data Guard enables read-only access to a physical standby database . Active Data Guard is the possibility to query our Physical Standby Database while it is constantly actualized to reflect the state of the Primary Database .

What is snapshot standby database?

A snapshot standby database receives and archives redo data from a primary database, but are not applied. Redo data received from the primary database is applied when a snapshot standby database is converted back into a physical standby database, after discarding all local updates to the snapshot standby database.

How do I start a logical standby database?

1. Create a Backup Copy of the Primary Database Datafiles.
2. Create a Control File for the Standby Database.
3. Prepare an Initialization Parameter File for the Standby Database.
4. Copy Files from the Primary System to the Standby System.
5. Set Up the Environment to Support the Standby Database.
6. Start the Physical Standby Database.

What is the difference between Data Guard and GoldenGate?

Data Guard is an Oracle specific technology while GoldenGate support heterogeneous database systems including all the major RDBMS as DB2,Sybase, MySQL . ... GoldenGate allows transformation of the data, with conflict management while it is being replicated between both database systems.

How do I know if my database is primary or standby?

1. Step 1 : Check the status of database on both server.
2. Step 2 : Check for GAP on Standby. ...
3. Step 3 & 4: Check redo received and applied on standby. ...
4. Step 5: Identify the missing archive log file. ...
5. Step 6: Copy missing archive log file. ...
6. Step 7: Register archive logfile with standby.

How do I start a physical standby database?

8.1. 1 Starting Up a Physical Standby Database

1. Start the database: SQL> STARTUP NOMOUNT;
2. Mount the standby database: SQL> ALTER DATABASE MOUNT STANDBY DATABASE;
3. Start the managed recovery operation: SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE 2> DISCONNECT FROM SESSION;

What is physical and logical standby database?

Physical standby database is always in managed recovery mode. We can only open the physical standby database in read only mode. But archive redo logs can not be applied while physical standby database is in read only mode. Logical standby database is always in open mode.

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.

What is Active Data Guard in Oracle?

Active Data Guard is a licensed option for Oracle Database Enterprise Edition. ... Data Guard automatically synchronizes the primary database and all standby databases by transmitting primary database redo - the information used by every Oracle Database to protect transactions - and applying it to the standby database.

What is Active Data Guard in Oracle 11g?

Oracle Active Data Guard, an option of Oracle Database 11g Enterprise Edition is a simple, high performance solution that protects your Oracle Database against planned and unplanned downtimes, by allowing you to offload resource workloads from your production database to one or more synchronized standby databases.