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What is Replication and Database Mirroring?

Posted By :Dhivakaran     Posted Date :October 25, 2010    Points :10   Category :Sql Server 
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.

You can also find related Interview Question to What is Replication and Database Mirroring?  below: 

Database Concurrency in Sql Server.

When two or more user try to update same type of data in a table then Database Concurrency helps in this situation.

There are 2 types of Database Concurrency

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Optimistic: When two user works on the same data in a table and one change that data first then second user cannot change that same data becasue the which he have using is allready changed so he cannot do the change becasue change apply to another data that is changed by first user. (More...)

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Different types of replication? Explain Each one..

The SQL Server 2000-supported replication types are:


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

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...)

Can SharePoint be linked to a SQL database?

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How many Files per database will accept?

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Name of the command to view the current amount of free (unallocated) space in the database in SQL Server?

Name of command is :sp_spaceused

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Let us say the SQL Server crashed and you are rebuilding the databases including the master database what procedure to you follow?

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Can multiple SharePoint installs point to the same DataBase?

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