Journalizing Modes and Benefits of Oracle CDC

 

Oracle Change Data Capture helps in real-time data integration across enterprise networks. This improves the availability as well as performance of databases and speeds up data warehousing activities.

This technology is often used in conjunction with other technologically-advanced tools and non-intrusive and efficient methods to carry out important replication activities with Oracle Change Data Capture. These activities include migrating databases to the cloud without stopping in-hand work or system downtime and off-loading queries for analytics from databases in production to data warehouses.



Benefits of Oracle Change Data Capture

One of the main benefits of Oracle Change Data Capture is that it comprehensively includes multiple activities like Update, Insert, and Delete along with all values that exist before and after the changes have been completed. Further, Asynchronous CDC can be configured suitably to ensure minimal impact on the source database. CDC includes DBMS_CDC_PUBLISH and DBMS_CDC_SUBSCRIBE packages which help to easily publish and subscribe interfaces. Lastly, Oracle Change Data Capture is a time and cost-saving solution as overheads are reduced substantially because of simplification of the extraction of the modified data from the Oracle database.

Oracle Change Data Capture Modes

Oracle CDC offers two journalizing modes.

One is the Synchronous Mode where triggers are placed at the source database. This ensures that any changes to the data at source are captured immediately. Each insert, update and delete task is performed by SQL Statement through a Data Manipulative Language activity.

The other is the Asynchronous Mode where data is sent to the redo log files where the changed data is captured after a SQL statement performs a DML activity.

Oracle Changed Data Capture is therefore a highly optimized data replication tool.

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