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Postgres-XC which is based on PostgreSQL provides scalable synchronous multi-master replication. [38] It is licensed under the same license as PostgreSQL. A related project is called Postgres-XL. Postgres-R is yet another fork. [39] Bidirectional replication (BDR) is an asynchronous multi-master replication system for PostgreSQL. [40]
Slony-I is an asynchronous master-slave replication system for the PostgreSQL DBMS, providing support for cascading and failover. Asynchronous means that when a database transaction has been committed to the master server, it is not yet guaranteed to be available in slaves. Cascading means that replicas can be created (and updated) via other ...
Multi-master replication can be contrasted with primary-replica replication, in which a single member of the group is designated as the "master" for a given piece of data and is the only node allowed to modify that data item. Other members wishing to modify the data item must first contact the master node.
PGD is a multi-master replication solution based on PostgreSQL. It supports CRDT column types. Novell, Inc. introduced a state-based CRDT with "loosely consistent" directory replication (NetWare Directory Services), included in NetWare 4.0 in 1995. [39] The successor product, eDirectory, delivered improvements to the replication process. [40]
In a distributed database system, a transaction could execute its operations at multiple sites. Since atomicity requires every distributed transaction to be atomic, the transaction must have the same fate (commit or abort) at every site.
SymmetricDS is open source software for database and file synchronization with Multi-master replication, filtered synchronization, and transformation capabilities. [2] It is designed to scale for a large number of nodes, work across low-bandwidth connections, and withstand periods of network outage. [3]
In essence, distributed SQL databases are built from the ground-up and NewSQL databases include replication and sharding technologies added to existing client-server relational databases like PostgreSQL. [12] Some experts define DistributedSQL databases as a more specific subset of NewSQL databases. [13]
This technique is supported by Microsoft SQL Server, [1] 4D Server, [2] MySQL, [3] and PostgreSQL. [ 4 ] [ 5 ] Similar to replication , the primary purpose of log shipping is to increase database availability by maintaining a backup server that can replace a production server quickly.