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What is database replicaion? What are the different types
of replication you can set up in SQL Server?
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Answer Posted / purna chandra rao.k
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.
There are three types of replication supported by SQL
SERVER:-
Snapshot Replication.
Snapshot Replication takes snapshot of one database and
moves it to the other
database.After initial load data can be refreshed
periodically.The only disadvantage of
this type of replication is that all data has to copied
each time the table is refreshed.
Transactional Replication
In transactional replication data is copied first time as
in snapshot replication , but later
only the transactions are synchronized rather than
replicating the whole database.You
can either specify to run continuously or on periodic basis.
Merge Replication.
Merge replication combines data from multiple sources into
a single central database.Again
as usual the initial load is like snapshot but later it
allows change of data both on subscriber
and publisher , later when they come on-line it detects and
combines them and updates accordingly
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