Data Base Replication

Question

Hi What is the Data Base replication. What are the different type replication you can set up in SQL Server ?

Satyapriya Nayak · Answer

Hi Arun Replication is the process of copying/moving data between databases on the same or different servers. 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 asin 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 subscriberand publisher  later when they come on-line it detects and combines them and updates accordingly Please refer the below links http://docs.oracle.com/cd/A58617_01/server.804/a58227/ch_repli.htm http://www.csee.umbc.edu/portal/help/oracle8/server.815/a67781/c31repli.htm Thanks