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Replicate Cosmos DB Data to Multiple Databases
Replicate Cosmos DB data to disparate databases with a single configuration.
Always-on applications rely on automatic failover capabilities and real-time access to data. CData Sync for Cosmos DB integrates live Cosmos DB data into your mirrored databases, always-on cloud databases, and other databases such as your reporting server: Automatically synchronize with remote Cosmos DB data from Windows or any machine running Java.
You can use Sync's command-line interface (CLI) to easily control almost all aspects of the replication. You can use the CLI to replicate Cosmos DB data to one or many databases without any need to change your configuration.
Connect to Cosmos DB Data
You can save connection strings and other settings like email notifications in XML configuration files.
The following example shows how to replicate to SQLite.
Windows
<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType>
<DatabaseProvider>System.Data.SQLite</DatabaseProvider>
<ConnectionString>AccountEndpoint=myAccountEndpoint;AccountKey=myAccountKey;</ConnectionString>
<ReplicateAll>False</ReplicateAll>
<NotificationUserName></NotificationUserName>
<DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
<TaskSchedulerStartTime>09:51</TaskSchedulerStartTime>
<TaskSchedulerInterval>Never</TaskSchedulerInterval>
</CDataSync>
Java
<?xml version="1.0" encoding="UTF-8" ?>
<CDataSync><DatabaseType>SQLite</DatabaseType><DatabaseProvider>org.sqlite.JDBC</DatabaseProvider>
<ConnectionString>AccountEndpoint=myAccountEndpoint;AccountKey=myAccountKey;</ConnectionString>
<ReplicateAll>False</ReplicateAll>
<NotificationUserName></NotificationUserName>
<DatabaseConnectionString>Data Source=C:\my.db</DatabaseConnectionString>
</CDataSync>
To obtain the connection string needed to connect to a Cosmos DB account using the SQL API, log in to the Azure Portal, select Azure Cosmos DB, and select your account. In the Settings section, click Connection String and set the following values:
- AccountEndpoint: The Cosmos DB account URL from the Keys blade of the Cosmos DB account
- AccountKey: In the Azure portal, navigate to the Cosmos DB service and select your Azure Cosmos DB account. From the resource menu, go to the Keys page. Find the PRIMARY KEY value and set AccountKey to this value.
Configure Replication Queries
Sync enables you to control replication with standard SQL. The REPLICATE statement is a high-level command that caches and maintains a table in your database. You can define any SELECT query supported by the Cosmos DB API. The statement below caches and incrementally updates a table of Cosmos DB data:
REPLICATE Customers;
You can specify a file containing the replication queries. This enables you to use the same replication queries to replicate to several databases.
Run Sync
After you have configured the connection strings and replication queries, you can run Sync with the following command-line options:
Windows
CosmosDBSync.exe -g MySQLiteConfig.xml -f CosmosDBSync.sql
Java
java -Xbootclasspath/p:c:\sqlitejdbc.jar -jar CosmosDBSync.jar -g MySQLiteConfig.xml -f CosmosDBSync.sql
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