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Applying schema changes in replicas involves several steps. First, you need to compare the replica schemas to find differences. This process produces a replica schema changes file. This file can then be imported to apply the changes.
In a connected environment, follow the steps in Comparing replica schemas to compare replicas and Importing a replica schema to import the changes.
In a disconnected environment, before you can compare replica schemas, you first need to export the schema to a file, then send it to the relative replica for comparison and import. See Exporting a replica schema to learn how to do this.