First, give conclusions that can be used for decision-making
Data migration is essentially a rule-of-business conversion, not a simple reproduction table. Empty values, duplicates, historical codes and exceptions in the old system require operational personnel to decide how to handle them; the development team is responsible for achieving reusable conversion scripts and reconciliation reports.
What conditions need to be identified before judgement is made?
The same question may have different answers under different business, data and project phases. It is suggested that the following conditions be checked and that the common findings on the web be incorporated into their own projects.
Suggested order of advance
First, we'll be clear about the target and the border.
Establish a list of sources, targets, fields, rules and responsible persons.
Validation Key Dependence
Performs a trial migration and generates quantities, amounts, key fields and unusual reports.
Development of assessable outcomes
Allows business users to sample the scenes and amend the rules and repeat the exercises.
Make sure you decide the next step with the real results.
Formally switch back-up and confirm incremental, retreat and signature processes.
How do you understand it in the actual business?
The business defines the common client key and merge rules, preserves the old code map; and moves with both a new calibre and a historical source of documentation. The examples do not represent the performance of a particular client, and the actual conclusions need to be verified in conjunction with the enterprise’s own business volume, sample, system and liability boundaries.
The easiest pit to step on.
Compare total number recorded before and after migration only
The rules of the cleaning are determined by the technicians alone, without business confirmation.
Official migration of complete scripts for first run, no auditions and time measurement
How should we end up receiving and confirming?
The report of acceptance and inspection shall include the scope of the migration, the rule version, the volume reconciliation, the list of anomalies, the results of the sample, performance and the record of the shutdown.
When preparing to communicate with suppliers or internal teams, it is recommended that current processes, representative samples, existing systems, planning time and budget levels be brought. First, the unknown items are clearly marked, and then the decision is made to use diagnostics, PoC, fixed-range projects or ongoing research and development, which is usually more reliable than a direct demand for a price and duration without borders.