Oracle GoldenGate – Integrated Capture Deployment Modes and Downstream Deployment Advantages

  • Integrated Capture requires Oracle RDBMS release 11.2.0.3 and later.
  • Integrated Capture is available in two modes: Local Deployment and Downstream Deployment

Local Deployment means that the source database and the logmining database are the same (that is, running in the same instance), which must be at least release 11.2.0.3
Downstream Deployment means that source database and the logmining database are different databases. The logmining server is created in the downstream instance.
The Redo Logs of the source database are continuously shipped to the downstream instance.

Integrated Capture: Downstream Deployment

  • A downstream mining server offloads the capture and transformation process overhead from the production source database thus improving replication performance.
  • Downstream deployment is the only option for Integrated Capture from Oracle RDBMS instances that earlier than 11.2.0.3.
  • If it is used with a downstream mining server, the release of the source database must be at least 10.2.0.0.
  • Downstream deployment offloads database capture and transformation, but it requires log shipping and other configuration changes.
  • It is important to note that the Oracle Database on the downstream machine is used to hold minimal data or metadata that is specific to the Oracle Internal Log processing module.
  • The standby Redo Logs (or archive Redo Logs) are not applied to the downstream database, but are processed by the Oracle Internal Log processing module and made available as Logical Change Records (LCRs) to the consumer thread of the Integrated Extract process.
  • The later is responsible for writing the processed data into the Oracle GoldenGate trail file.

There are two types of Downstream Deployments: Real-Time and Deferred Downstream Deployment.

  • Real-Time Downstream Deployment
  • In this deployment configuration, Redo Logs are shipped continuously to the downstream machine as “standby Redo Logs”.
  • Deferred Downstream Deployment
  • When replication SLAs enable a longer lag time between the source and target databases, and when synchronization can be deferred, archive redo files are shipped at regular intervals to the downstream mining database.
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Muhammad Rawish Siddiqui

Master in Computer Science (Database Engineering) and PGD in Management Information System.
45+ Online Certifications, which includes EDRP (EC-Council Disaster Recovery Professional), Data Management, Security+, DBaaS - Cloud Certified Expert, Oracle Cloud Autonomous Database Specialist, Oracle Database Cloud Certified Professional, Oracle Cloud Infrastructure, OCP 7.3, 10g, 11g, 11i, R12, OCE/OCS 11i System Administration, Solaris, Linux and Real Application Cluster 10g, 11g, Oracle Autonomous Database, Real Application Cluster, Oracle Data Guard and Performance Tuning etc. .

Foremost interested areas include, Data Management, Oracle Databases and EBS Health Checks, Real Application Cluster, Disaster Recovery, GoldenGate and Oracle Cloud.
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