Internet, Networking, & Security Web Development Microsoft SQL Server: Snapshot Replication By Mike Chapple Writer Former Lifewire writer Mike Chapple is an IT professional with more than 10 years' experience cybersecurity and extensive knowledge of SQL and database management. our editorial process Twitter Mike Chapple Updated March 17, 2019 Mike Chapple Web Development SQL CSS & HTML Web Design Tweet Share Email SQL Server's snapshot replication technology allows you to automatically transfer information between multiple SQL Server databases. This technology is a great way to improve the performance and/or reliability of your databases. There are many ways that you might use snapshot replication in your SQL Server databases. For example, you may use this technology for geographically distributing data to databases located at remote sites. This improves performance for end users by placing the data in a network location close to them and simultaneously reduces the load on intersite network connections. Snapshot Replication for Distributing Data You may also use snapshot replication for distributing data across multiple servers for load-balancing purposes. One common deployment strategy is to have a master database that is used for all update queries and then several subordinate databases that receive snapshots and are used in a read-only mode to provide data to users and applications. Finally, you may use snapshot replication to update data on a backup server to be brought online in the event the primary server fails. When you use snapshot replication, you copy the entire database from the Publisher SQL Server to the Subscriber SQL Server(s) on a one-time or recurring basis. When the Subscriber receives an update, it overwrites its entire copy of the data with the information received from the Publisher. This can take quite a long time with large datasets and it is imperative that you carefully consider the frequency and timing of snapshot distribution. For example, you would not want to transfer snapshots between servers in the middle of a busy data on a highly congested network. It would be much more prudent to transfer the information in the middle of the night when users are at home and bandwidth is plentiful.