SymmetricDS 3.6.16

An open source and free software designed from the get-go to enable users replicate and synchronize tables between relational databases.
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SymmetricDS is web-enabled, database independent, data synchronization/replication software. It uses web and database technologies to replicate tables between relational databases in near real time.

The software was designed to scale for a large number of databases, work across low-bandwidth connections, and withstand periods of network outage.

By using database triggers, SymmetricDS guarantees that data changes are captured and atomicity is preserved.

Support for database vendors is provided through a Database Dialect layer, with implementations for MySQL, SQL Server, PostgreSQL, HSQLDB, Oracle, and Apache Derby included.

Synchronization can be configured to push data (trickle-back) or pull data (trickle-poll) at an interval. SymmetricDS allows for 2-tier and even n-tier synchronization, such as the following:
· A farm of web server nodes fronting an enterprise-class general office database
· A handful of regional servers for synchronizing from the general office to remote geographical areas
· 1000(s) of store server nodes using a departmental class database to sync with a regional node
· 10(s) of Point of Sale (POS) register nodes using an embedded database to sync with a store server

Deployment options include the following:
· Web application archive (WAR) deployed to an application server such as Tomcat, Jetty, or JBoss
· Standalone service
· Embedded in an application

Main features:

  • Data Channels - Table synchronizations are grouped into independent channels
  • Guaranteed Delivery - Synchronized data is guaranteed to arrive at the target destination. If a synchronization fails, the same batch of data will be retried until it succeeds or manual intervention is taken. All other data synchronization is halted for the failed channel only.
  • Transaction Aware - Data updates are recorded and replayed with the same atomicity
  • Centralized Configuration - All configuration is downloaded from a central registration server
  • Multiple Deployment Options - Standalone engine, web application, embedded software component
  • Data Filtering and Rerouting - Allows for localized passwords and sensitive data filtering/routing
  • HTTP Transport - Pluggable transport defaults to Representation State Transfer (REST-style) HTTP services
  • Payload Compression - Optionally compresses data on transport
  • Notification Schemes - Push (trickle-back data) or Pull (trickle-poll data) changes
  • Symmetric Data Protocol - A fast streaming data format that is easy to generate, parse, and load
  • Plug-In API - Add customizations through extensions and plug-in points
  • Two-Way Table Synchronization - The same table can be synchronized both to and from the host system while avoiding update loops
  • Database Versioning - Specify data synchronization by version of target database
  • Auto Database Creation - Optionally allow creating and upgrading of database schema
  • Embeddable - Small enough to embed or bootstrap within another application (i.e. a POS application)
  • Multiple Schemas - Supports multiple database schemas naturally through the existence of Data Channels
  • Primary Key Updates - Captures the "before" and "after" data being changed, allowing updates to primary key data
  • Remote Management - Administration through a Java Management Extensions (JMX) console
  • Remote Database Administration - SQL can be delivered and run at remote databases via the synchronization infrastructure
  • Initial Data Load - Prepare the satellite database with an initial or recovery load of data

last updated on:
December 3rd, 2014, 6:21 GMT
file size:
61.4 MB
developed by:
SymmetricDS Team
license type:
operating system(s):
Mac OS X
binary format:
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3 Screenshots
What's New in This Release:
  • 0002093: [Bug] Table structure changes, sym_trigger is updated and old table structure is used for new trigger (chenson) - closed.
  • 0002090: [Bug] Informix installations fail when existing SymmetricDS tables exist due to case sensitive comparisons (josh-a-hicks) - closed.
  • 0002097: [Bug] sync triggers gets called during and initial load (chenson) - closed.
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