replication

replication

In database management, the ability to keep distributed databases synchronized by routinely copying the entire database or subsets of the database to other servers in the network.

There are various replication methods. Primary site replication maintains the master copy of the data in one site and sends read-only copies to the other sites. In a workflow environment, the master copy can move from one site to another. This is called "shared replication" or "transferred ownership replication." In symmetric replication, also called "update-anywhere" or "peer-to-peer replication," each site can receive updates, and all other sites are then updated. Failover replication, or hot backup, maintains an up-to-date copy of the data at a different site for backup. See mirroring, disaster recovery and distributed database.

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replication [‚rep·lə′kā·shən]

(analytical chemistry)

The formation of a faithful mold or replica of a solid that is thin enough for penetration by an electron microscope beam; can use plastic (such as collodion) or vacuum deposition (such as of carbon or metals) to make the mold.

(cell and molecular biology)

Duplication, as of a nucleic acid, by copying from a molecular template.

(statistics)

In experimental design, the repetition of an experiment or parts of an experiment to secure more data as an aid to determining the experimental error and to arrive at better estimates of the effects of various treatments with smaller standard errors.

(virology)

Multiplication of phage in a bacterial cell.

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(database, networking)

replication - Creating and maintaining a duplicate copy of a database or file system on a different computer, typically a server. The term usually implies the intelligent copying of parts of the source database which have changed since the last replication with the destination. Replication may be one-way or two-way. Two-way replication is much more complicated because of the possibility that a replicated object may have been updated differently in the two locations in which case some method is needed to reconcile the different versions. For example, Lotus Notes can automatically distribute document databases across telecommunications networks. Notes supports a wide range of network protocols including X25 and Internet TCP/IP. Compare mirror. See also rdist.