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SQL server replication tools

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SQL server replication tools

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  1. Overview of SQL Server Replication Components Modern businesses generate massive amounts of data with the IT departments expected to keep data online and accessible round the clock. This puts intense pressure on the systems to maintain, store, and manage the data. There is also the additional activity of replacing outdated data with new and more agile techniques of which SQL Server Replication is the most suitable to accommodate these demands.

  2. What is SQL Server Replication • SQL Server Replication is a widely-used technology that helps to copy and distribute data and database from one source to another. After completing this activity the process synchronizes between the databases so that the consistency and the integrity of the data are maintained. This process can be programmed to run constantly or at pre-determined intervals. There are several replication techniques such as one-way, one-to-many, many-to-one, and bi-directional, all of which leads to datasets being in sync with each other.

  3. Types of SQL Server Replication Tools • There are three distinct types of SQL server replication tools. # Snapshot ReplicationThis tool simply takes a “snapshot” of the data on one server and moves it to another or another database in the same server. After the first synchronization snapshot, it is possible to periodically refresh data in published tables as per the pre-programmed schedule. This is the easiest of all replication tools but comes with a rider - all data has to be copied each time a table is refreshed. Between scheduled refreshes in snapshot replication, the data on the publisher might be different from the data on the subscriber.  

  4. # Transactional ReplicationIn transactional replication, data is copied from the publisher to the subscriber(s) once and then transactions are delivered to the subscriber(s) as and when they take place on the publisher. The initial copy of the data is transported in a similar process as snapshot replication where the SQL server takes a snapshot of data on the publisher and then forwards it to the subscriber(s). But here, as and when database users update, insert or delete records on the publisher, transactions are forwarded to the subscriber(s).

  5. # Merge ReplicationIn this technique, data from multiple sources are combined into a single central database. As in transactional replication, merge replication also uses initial synchronization through the snapshot of data on the publisher and moves it to subscribers. But unlike transactional replication, this method permits modifications of the same data on publishers and subscribers, even though subscribers might not be connected to the network. Whenever subscribers connect to the network, merge replication tool will notice it and combine changes from all subscribers and change the existing data on the publisher. Of all SQL server replication tools, merger replication is very useful if there is a need to modify data on remote computers even in the absence of continuous connection to the network.There are some of the important concepts of SQL server replication tools. 

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