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Choosing right database for storing bank transactions

Database Administrators Asked by Vojtěch on September 18, 2020

I am starting a new project within GCP and I am trying to choose a right tool for storing bank transactions:

  1. I don’t need transactions, these will be basically write-only, no updates
  2. I don’t need joins and relations
  3. I need grouping and sums
  4. Ideally I would like to use a managed tool within GCP
  5. I need to be able to have unique records (identified by ID or by the uniqueness of the record)

GCP solutions:

  1. Firestore
    • I really like the way of authorisation via service accounts, no need for users/passwords
    • Fulfils 1, 2, 4, 5
    • Completely unsuitable to fulfil point 3
  2. CloudSQL
    • fulfils 3 and 5, but I find it too complex for my need
    • old-way authorisation of MySQL – one cannot use GCP authorisation
  3. Elasticsearch
    • fulfils 3 and 5 but also too complex
    • Not within GCP, not managed, cannot use GCP auth
  4. BigQuery
    • Seems to fulfil all 1, 2, 3, 4
    • Unfortunately it seems it cannot prevent having duplicate records
    • Data becomes available after long time
  5. BigTable
    • Seems too complex for such simple requirements

Could you think of another approach?

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