Slony-I - Replication System for PostgreSQL

•    C

Slony-I is a "master to multiple slaves" replication system with cascading and failover. Slony-I is a system designed for use at data centers and backup sites, where the normal mode of operation is that all nodes are available.

ssb-db - A database of unforgeable append-only feeds, optimized for efficient replication for peer to peer protocols

•    Javascript

A database of unforgeable append-only feeds, optimized for efficient replication for peer to peer protocols. ssb-db provides tools for dealing with unforgeable append-only message feeds. You can create a feed, post messages to that feed, verify a feed created by someone else, stream messages to and from feeds, and more (see API).

mosql - MongoDB to PostgreSQL Streaming Replication

•    Ruby

MoSQL imports the contents of your MongoDB database cluster into a PostgreSQL instance, using an oplog tailer to keep the SQL mirror live up-to-date. This lets you run production services against a MongoDB database, and then run offline analytics or reporting using the full power of SQL.

Maatkit - Power tools for open-source databases

•    Perl

Maatkit is a toolkit for users, developers, and administrators of open-source databases. Most of Maatkit’s functionality is designed for MySQL. It makes MySQL easier and safer to manage. Maatkit could be used to prove replication is working correctly, fix corrupted data, automate repetitive tasks, speed up your servers, and much more.

db4o

•    Java

db4o open source object database, native to Java and .NET.

SQL Server Replication Explorer

SQL Server Replication Explorer is a client tool for browsing through Microsoft SQL Server replication topology. It can also be used for troubleshooting and monitoring of the Microsoft SQL Server replication.

SymmetricDS - Multi Database Replication

•    Java

SymmetricDS is a database and file synchronization solution that is platform-independent, web-enabled, and database agnostic. SymmetricDS was built to make data replication across two to tens of thousands of databases and file systems fast, easy and resilient. It supports near real time, bi-directional data replication across large node networks over the WAN or LAN.

orchestrator - MySQL replication topology management and HA

•    Go

orchestrator actively crawls through your topologies and maps them. It reads basic MySQL info such as replication status and configuration.It provides with slick visualization of your topologies, including replication problems, even in the face of failures.

DBBalancer - Middleware btw Database client and server

•    C++

DBBalancer is some sort of middleware that would sit in between of database clients and a server. Currently the only server supported is Postgres, but the architecture is open to embrace more servers in a future. It's a connection pool, a load balancer and a database replicator.

MongoShake - MongoShake is a universal data replication platform based on MongoDB's oplog

•    Go

This is a brief introduction of Mongo-Shake, please visit english wiki or chinese wiki if you want to see more details including architecture, data flow, performance test, business showcase and so on. Mongo-Shake is developed and maintained by Nosql Team in Alibaba-Cloud. Mongo-Shake is a universal platform for services based on MongoDB's oplog. It fetches oplog from source mongo database, and replays in the target mongo database or sends to other ends in different tunnels. If the target side is mongo database which means replay oplog directly, it's like a syncing tool that used to copy data from source MongoDB to another MongoDB to build redundant replication or active-active replication. Except for this direct way, there are others tunnel types such like rpc, file, tcp, kafka. Receivers wrote by users must define their own interfaces to connecting to these tunnels respectively. Users can also define there own tunnel type which is pluggable. If connecting to a third-party message middleware like kafka, the consumer can get the subscriber data in an asynchronous way in pub/sub module flexibly. Here comes general data flow, The source can be either single mongod, replica set or sharding while target can be mongod or mongos. If the source is replica set, we suggest fetching data from secondary/hidden to ease the primary pressure. If the source is sharding, every shard should connect to Mongo-Shake. There can be several mongos on the target side to keep high availability, and different data will be hashed and written to different mongos.

DBTransfer - Versatile and fast database transfer tool

•    Java

DBTransfer is a multi-platform java tool, that aims to replicate one database (JDBC or MS Access) to another (JDBC), using an one to one conversion.

gopli - DB replication tool to synchronize data with multi environments written in Golang.

•    Go

Database backup between remote hosts (or local) written in Golang. Write down setting file in toml.

Citus - Scalable PostgreSQL for multi-tenant and real-time workloads

•    C

Citus is a distributed database that scales across commodity servers using transparent sharding and replication. Citus extends the underlying database rather than forking it, giving developers and enterprises the power and familiarity of a relational database. As an extension, Citus supports new PostgreSQL releases, and allows you to benefit from new features while maintaining compatibility with existing PostgreSQL tools.

repmgr - The Most Popular Replication Manager for PostgreSQL (Postgres) - latest version 4

•    C

repmgr is a suite of open-source tools to manage replication and failover within a cluster of PostgreSQL servers. It enhances PostgreSQL's built-in replication capabilities with utilities to set up standby servers, monitor replication, and perform administrative tasks such as failover or switchover operations. repmgr 4 is a complete rewrite of the existing repmgr codebase, allowing the use of all of the latest features in PostgreSQL replication.

secure-scuttlebutt - A database of unforgeable append-only feeds, optimized for efficient replication for peer to peer protocols

•    Javascript

A database of unforgeable append-only feeds, optimized for efficient replication for peer to peer protocols. Secure-scuttlebutt provides tools for dealing with unforgeable append-only message feeds. You can create a feed, post messages to that feed, verify a feed created by someone else, stream messages to and from feeds, and more (see API).

pglogical - Logical Replication extension for PostgreSQL 9

•    C

The pglogical extension provides logical streaming replication for PostgreSQL, using a publish/subscribe model. It is based on technology developed as part of the BDR project (http://2ndquadrant.com/BDR). To use pglogical the provider and subscriber must be running PostgreSQL 9.4 or newer.

Tendermint - Tendermint Core (BFT Consensus) in Go

•    Go

Tendermint Core is Byzantine Fault Tolerant (BFT) middleware that takes a state transition machine - written in any programming language - and securely replicates it on many machines.

Tungsten Clustering and Replication

•    Java

Tungsten is a family of open source technologies for database clustering and replication. Tungsten includes replication, management, SQL routing, and proxying that improve database availability, protect data, and raise application throughput.

SQL Relay - Database Connection Pool library with API available in all programming languages

•    C++

SQL Relay is a persistent database connection pooling, proxying and load balancing system for Unix and Linux supporting ODBC, and all major databases. It has APIs for C, C++, ODBC, Perl, Perl-DBI, Python, Python-DB, Zope, PHP, Ruby, Ruby-DBI, Java, TCL and Erlang, drop-in replacement libraries for MySQL and PostgreSQL clients.

FiBRE - The FireBird Replication Engine

•    Java

Free replication tools for the FireBird database