Tips On SQL Server Replication Software
If you have a large company and have many servers throughout the company, you can achieve a lot of benefits from SQL Server replication software. SQL Server includes a series of add-on services whose purpose is to provide better, more powerful system management solutions. SQL replication services are used to replicate and synchronize database objects across multiple replication agents (other servers from the network or database caches on the client side). Of course, you can do SQL server replication with specially designed software. One of the benefits SQL Server replication offers is that you can achieve an efficient load balancing, by distributing data and query load between all the servers in the network. Server Replication is also useful for manipulate data from the main database on a system that is not connected to the network all the time. When it connects with the rest of the systems, the database will automatically update itself on this machine as well. Another purpose of SQL Server Replication is to provide data redundancy by spreading the database over multiple servers within the company. Because all the machines will store the same information that is constantly and automatically updated thanks to Server Replication, each system is ready to take the load if something happens with another machine. There are two parts within a replication scenario: Publishers and Subscribers. The data is stored and available on the Publisher servers. A certain network can have one or more such Publisher servers. The servers that you want to receive the data from the Publisher server are called the Subscribers. The Subscribers will receive the data when the Publishers will update their stored information. The SQL Server Replication service allows for a system to be both a Publisher and a Subscriber in the same time. Microsoft SQL Server supports three types of server replication services: merge replication, transactional replication and snapshot replication. When configures in merge replication mode, both the Subscriber and the Publisher can make changes to the SQL database independently. Users can work both on the subscriber and the publisher even if there is no network link between the two system. Once the two machines are connected again, the replication agent will verify if there are differences between the two versions of the database and will modify them if necessary. Laptop users mainly use this replication mode because they are not always connected to the network. When the SQL Server is configured to work in the transactional replication method, it takes a snapshot of all the data and objects in the database. Transactional consistency is guaranteed as all the changes are transmitted by the publisher to the subscriber almost in real time and in the same order as they had been performed on the publisher itself. Snapshot replication is another replication method provided by SQL Server, but because it is time and resource consuming, it is mostly used in databases which are updated not too frequent. The Publisher takes a snapshot of the entire database and then it will transmit it to all the Subscribers in the network. |
