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What is replication?

Posted By :Ramesh P     Posted Date :October 19, 2010    Points :10   Category :.NET Framework 
Replication is way of keeping data synchronized in multiple databases. SQL server replication has two important aspects publisher and subscriber.

Publisher: Database server that makes data available for replication is called as publisher.
Subscriber: Database servers that get data from the publishers is called as subscribers.

You can also find related Interview Question to What is replication?  below: 

Different types of replication? Explain Each one..

  
The SQL Server 2000-supported replication types are:

Transactional
Snapshot
Merge

Snapshot replication:
Snapshot replication distributes data exactly as it appears at a specific moment in time and does not monitor for updates to the data. Snapshot replication is best used as a method for replicating data that changes infrequently or where the most up-to-date values (low latency) are not a requirement. When synchronization occurs, the entire snapshot is generated and sent to Subscribers.

Transactional replication:

Transactional replication, an initial snapshot of data is applied at Subscribers, and then when data modifications are made at the Publisher, the individual transactions are captured and propagated to
Subscribers.


Merge replication:
Merge replication is the process of distributing data from Publisher to Subscribers, allowing the Publisher and Subscribers to make updates while connected or disconnected, and then merging the updates between sites when they are connected. (More...)

what is Replication?

  
Replication is a set of technologies for copying and distributing data and database objects from one database to another
and then synchronizing between databases to maintain consistency.
Using replication, you can distribute data to different locations and to remote or mobile users over local and wide area
networks, dial-up connections, wireless connections, and the Internet.
(More...)

What is Replication and Database Mirroring?

  
Database mirroring can be used with replication to provide availability for the publication database. Database mirroring involves two copies of a single database that typically reside on different computers. At any given time, only one copy of the database is currently available to clients which are known as the principal database. Updates made by clients to the principal database are applied on the other copy of the database, known as the mirror database. Mirroring involves applying the transaction log from every insertion, update, or deletion made on the principal database onto the mirror database. (More...)

What are the different types of replication?

  
The SQL Server 2000-supported replication types are as follows:
· Transactional
· Snapshot
· Merge
Snapshot replication distributes data exactly as it appears at a specific moment in time and does not monitor for updates to the data. Snapshot replication is best used as a method for replicating data that changes infrequently or where the most up-to-date values (low latency) are not a requirement. When synchronization occurs, the entire snapshot is generated and sent to Subscribers.
Transactional replication, an initial snapshot of data is applied at Subscribers, and then when data modifications are made at the Publisher, the individual transactions are captured and propagated to Subscribers.
Merge replication is the process of distributing data from Publisher to Subscribers, allowing the
Publisher and Subscribers to make updates while connected or disconnected, and then merging the updates between sites when they are connected. (More...)

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