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An Article is the smallest component of distribution, and can be a table, procedure or function.If it is a table, then a filter can be applied to it so that only certain rows or columns are replicated.A ‘Subscriber’ receives the articles from a publisher. Any database can take on either role or even both roles at once.A Distributor is a specialist database that runs the ‘Replication agents’.It is therefore best to create the replication once the design of the publisher is relatively stable.In most topologies, it makes sense for publishers, distributors, and subscribers to be on separate physical hardware.

(The database with the original location of the data determines what is to be distributed).Often, where the data from several databases need to be ‘warehoused’ centrally in an OLAP or reporting database, one will find a single ‘reporting’ database subscribing to several publications.One can come across other topologies such as ‘bi-directional’ and ‘peer to peer’ which are really special cases of Central Publisher or Central Subscriber and use transactional replication The distribution of data can be relayed to other subscribers via a publishing subscriber.This requires a fully documented recovery strategy, which has to be periodically tested and practiced.This means that the whole replication topology and configuration must be scripted so it can be re-created in an emergency, even if the system was originally built using the GUI tools.This allows replication to be implemented over low-bandwidth WANs to a subscriber that, in turn, distributes it to other servers within its high-bandwidth LAN Replication begins with the initial synchronization of the published objects between the Publisher and Subscribers, using a snapshot.

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