The Database Link method transfers data directly from the source database to the target database using an established database link, without any intermediate storage. This method works best when both databases are in the same network or connected through a stable, high speed link. Since it uses SQL INSERT statements to move data, the process is straightforward but can be slower for large datasets due to SQL execution overhead.

Database Link is less suited for large datasets or cross-region migrations, where latency could significantly slow down the process. It is best used for small to medium sized transfers where simplicity outweighs performance concerns.

The Object Storage method stages initial load data in an Oracle Object Storage before importing it into the target database. GoldenGate first exports data from the source into Data Pump files, stores them in the specified bucket, and then imports them into the target. This approach eliminates the need for a direct network connection between source and target, which is suitable for cross region, cloud to cloud, or hybrid cloud migrations.

A direct database connection may be slow or restricted, so the data is staged in Object Storage and securely fetched by the target system. This method is highly reliable for large datasets and supports resumable transfers in case of interruptions. However, it requires additional configuration for bucket creation and wallet authentication, as well as extra storage space for staging files. It is best used when the migration involves large volumes of data across different regions or environments.

The File Storage method facilitates initial load by exporting source data into disk files on the GoldenGate server. These files are then ingested into the target database. This method is particularly effective when both source and target databases are non Autonomous Database and can access a shared storage layer, such as:

• Network File System (NFS) mounts
• Oracle File Storage Service (FSS)
• Docker volume mapping (for containerized database installations)

By leveraging shared storage, whether on premises or cloud based organizations can achieve high throughput data transfer and maintain control over the staging environment.

This method mirrors the Object Storage approach but is tailored for environments without access to native cloud object storage. By using shared storage, organizations can replicate the reliability and efficiency of object storage in on premises or hybrid setups.

GoldenGate writes extracted data files to the shared location, and the target database reads these files for ingestion. This intermediate staging allows for data validation, auditing, and performance tuning before final load. It’s particularly useful in secure environments with strict compliance requirements and high speed LAN connectivity.

This setup ensures fast, secure data transfer, audit-friendly staging, and full control over sensitive financial data.