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Preface This user guide introduces SymmetricDS and its features for data synchronization. It is intended for users, developers, and administrators who want to install the software, configure synchronization, and manage its operation.
Thank you to all the members of the open source community whose feedback and contributions helped us build better software and documentation. This version of the guide was generated on Introduction SymmetricDS is open source software for database and file synchronization, with support for multi-master replication, filtered synchronization, and transformation.
It uses web and database technologies to replicate change data as a scheduled or near real-time operation, and it includes an initial load feature for full data loads. The software was designed to scale for a large number of nodes, work across low-bandwidth connections, and withstand periods of network outage.
Most major operating systems and databases are supported. See the list of supported databases in the Database Compatibility section. The minimum operating system requirements are: The best way to size a server is to simulate synchronization in a lower environment and benchmark data loading.
Multiple servers can be used as a cluster behind a load balancer to achieve better performance and availability. Overview A node is responsible for synchronizing the data from a database or file system with other nodes in the network using HTTP.
Nodes are assigned to one of the node Groups that are configured together as a unit. The node groups are linked together with Group Links to define either a push or pull communication. A pull causes one node to connect with other nodes and request changes that are waiting, while a push causes one node to connect with other nodes when it has changes to send.
While nodes can be separated across wide area networks, the database a node is connected to should be located nearby on a local area network for the best performance. Using its database connection, a node creates tables as a Data Model for configuration settings and runtime operations.
The user populates configuration tables to define the synchronization and the runtime tables capture changes and track activity. The tables to sync can be located in any Catalog and Schema that are accessible from the connection, while the files to sync can be located in any directory that is accessible on the local server.
At startup, SymmetricDS looks for Node Properties Files and starts a node for each file it finds, which allows multiple nodes to run in the same instance and share resources.
The property file for a node contains its external ID, node group, registration server URL, and database connection information. The external ID is the name for a node used to identify it from other nodes. One node is configured as the registration server where the master configuration is stored.
When a node is started for the first time, it contacts the registration server using a registration process that sends its external ID and node group.Starting with PowerShell , you can run any command from a module without having to first import it. PowerShell will search the module directories.
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