Las estrategias de alta disponibilidad de DDBD
Failover Clustering
A failover cluster is a group of independent computers that work together to increase the availability and scalability of clustered roles (formerly called clustered applications and services). The clustered servers (called nodes) are connected by physical cables and by software.
Database Mirroring
A database mirror is a complete backup of the database that can be used if the primary database fails. Transactions and changes to the primary database are transferred directly to the mirror and processed immediately so the mirror is always up-to-date and available as a “hot” standby.
Database replication
Database Replication
Database replication is the frequent electronic copying of data from a database in one computer or server to a database in another -- so that all users share the same level of information.
types of database replication
There are four types of MS SQL Server replication — snapshot, transactional, peer-to-peer and merge replication.
database replication in SQL Server
The Always On availability groups feature is a high-availability and disaster-recovery solution that provides an enterprise-level alternative to database mirroring. Introduced in SQL Server 2012 (11. x), Always On availability groups maximizes the availability of a set of user databases for an enterprise.



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