Pro ยท Lesson 11 of 11

Capstone

Write the cutover plan for one migration. You do not need an AWS account to finish the writing. You do need the decisions from the earlier lessons.

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Picture it this way

The capstone is the moving-day list: which truck, which boxes, who keeps the diary, who counts, and who flips the shop sign. The sign flip is the application, not the task status.

The plan you will write

Name the source, the target, homogeneous or heterogeneous, the schema tool, the compute choice, the task type, the log you must retain, the validation you will read, and the person who changes the application connection string.

Include a rollback sentence. If CDC latency is not acceptable at the decision time, the application stays on the source. A running task is not permission to cut over.

A mapping you can explain

Use an explicit include list. Say which table you left out and why. If you need a rename, put it in a transformation and say so. Do not hide a rename inside a hope that the target table already matches.

Cutover check Go only if
Endpoint test Both ends pass from the DMS network
CDC latency It is steady and small enough for this application
Validation No unexplained mismatches on the tables you included
Sequences or identity The next key is above the loaded maximum
Application The connection change is rehearsed and reversible

The sign flips last

  1. Schema
  2. Load
  3. CDC

Step 1 of 3Schema, load, and CDC happen while the application still uses the source.

Lab: the cutover page

Fill every line. Unknown is allowed. A blank is not.

Source and version:
Target and version:
Homogeneous or heterogeneous:
Schema tool:
Compute (instance class or serverless range):
Task: full load and CDC, or another mode, and why:
Log retention owner:
Mapping includes:
Mapping excludes:
Validation result required:
Sequence or identity check:
Who changes the application:
Rollback:

Concept summary

Knowledge check

What flips the users onto the new database?

CDC latency is still climbing at the decision time. What does the plan say?

Which assessment must be green before a heterogeneous load?

Official sources

Checked against the linked documentation in October 2026. A later release can move a flag, a price, or a supported pair. Use the page for the version you installed.