Migrate on demand
Problem/Context
In a Replacement project where the existing system is based on a database. Large amounts of data, but most of it is inactive at any one time. This pattern is easiest to use when the business can accept a delay from the time a record is requested before it becomes available in the new system.
Solution
Migrate data on a just in time basis. When a record is requested, it (and all related data) is migrated.
Strengths
- Makes migration an ongoing process instead of a big bang effort