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Ongoing Replication CDC Using AWS DMS

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Ongoing Replication CDC Using AWS DMS

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  1. Ongoing Replication CDC Using AWS DMS Cloud-based Amazon Web Service Data Migration Service (AWS DMS) helps in quick and seamless migration of relational databases, data warehouses, NoSQL databases, and more. Migration is facilitated between on-premises databases to the cloud, from cloud to cloud, and even Cloud to on-premises. At least one of the data repositories should be functioning in the cloud.

  2. Before going to AWS DMS CDC, it is necessary to understand the concept of CDC. Change Data Capture (CDC) is the process of recording changes made in the current production data or metadata. The changes recorded are then stored in a separate data repository replication software. AWS DMS CDC captures changes made to the current data at the source while migrating data to the target continually.

  3. Launch of AWS DMS CDCIn June 2018, AWS Database Migration Service launched native Change Data Capture support with the capability to start and stop AWS DMS replication from a particular checkpoint. The AWS DMS CDC checkpoints can be used as a log sequence number (LSN) in Microsoft SQL Server, a system change number (SCN) in Oracle, and an AWS DMS–specific recovery checkpoint. As part of the launch, AWS also introduced the ability to stop data replication and start it again through the AWS DMS checkpoint.

  4. AWS DMS CDC uses the same mechanic that the database uses for commit sequencing, which is the log sequence number (LSN), and also provides more integration use cases. For example, the Oracle Data Pump or SQL Server BCP may be used for the initial data load into a target database and later used as the DMS log sequence numbers to start Change Data Capture. This checkpoint feature, along with the native point support allows hibernating environments and processing changes since the time of the last replication. Initially, AWS DMS CDC supported the Oracle, SQL Server, and MySQL databases. More followed subsequently.

  5. Determining an AWS DMS CDC A native start point is a specific point in the log of the database engine that defines the time when the CDC can be started. Consider the case where a bulk data dump has been applied to the target to start from a fixed pre-set time. Here, it is possible to look up the native start point for the ongoing replication-only task from a point before the dump was started.

  6. Using a Checkpoint as Start Point for AWS DMS CDCA continuing replication activity migrates changes, and AWS DMS caches checkpoint info that is specific to AWS DMS periodically. This checkpoint creates information to help the replication engine know the recovery point of the changed stream and can also be used to revert to the timeline of changes to recover a failed migration task. A checkpoint permits initiating another ongoing replication activity for another target at any time. • These are some of the intricacies of Amazon Web Service Data Migration Service Change Data Capture (AWS DMS CDC) technology.

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