Tá imircí móra (bunachar sonraí nua, creatlach nua, ardán nua) i bpéirc ard toisc go dtéann siad i bhfeidhm ar gach rud agus nach soláthrann siad aon luach infheidhmithe do úsáideoir go dtí go mbíonn siad críochnaithe. Is é an cur chuige slán ná incréamach agus inroghnaithe, riamh ní bhaineann le "big-bang cutover". Imircíonn tú i sliseanna is féidir a bhailíochtú agus a rolladh siar.
Clár imeartha slán
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1. Know WHY — a migration with no clear payoff isn't worth the risk.
2. Migrate INCREMENTALLY — never flip everything at once.
3. Run OLD and NEW in parallel — strangler-fig pattern.
4. Use feature flags / DUAL WRITES to shift traffic gradually.
5. VERIFY continuously — compare old vs. new outputs (shadow traffic).
6. Keep a ROLLBACK path at every step.
7. Clean up the old system only AFTER the new one is proven.