![]() ![]() Network latency is the time taken by the data to travel across a network and back to the source. Considerationsīefore we start, we must take into account a few important considerations when planning a staggered database migration strategy: network latency and network bandwidth. In this post, I show you how to configure and utilize oracle_fdw in Amazon RDS for PostgreSQL to allow you to progressively migrate your Oracle databases into PostgreSQL on AWS regardless of whether or not they’re using Oracle database links. You can use the extension with Oracle databases running on-premises, in Amazon Elastic Compute Cloud (Amazon EC2), or Amazon Relational Database Service (Amazon RDS) for Oracle, The extension allows you to connect AWS managed PostgreSQL databases to Oracle databases regardless of where they’re running. As of Jthis popular extension has been available in Amazon Relational Database Service (Amazon RDS) for PostgreSQL and as of Augthis extension has been available in Amazon Aurora PostgreSQL-Compatible Edition. This extension allows a PostgreSQL database to connect directly with an Oracle database-much like database links do in Oracle databases. The Oracle Foreign Data Wrapper (oracle_fdw) has been available as a production-ready extension to the community version of PostgreSQL since April 8, 2014. The dilemma here is how to unravel this spiderweb of interconnectivity it’s very rare that you can migrate all the databases at the same time in a big bang approach, which leads to the need for cross-engine database connectivity. One of the challenges organizations face when looking to modernize their Oracle database estates is the degree of interoperability between databases, which often manifests as large numbers of database links between these databases.
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