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In NestJS, why are transactions important when working with databases?

easy📝 Conceptual Q1 of 15
NestJS - Database with TypeORM
In NestJS, why are transactions important when working with databases?
AThey ensure multiple database operations succeed or fail together
BThey speed up database queries automatically
CThey allow direct access to the database without a service
DThey replace the need for database indexes
Step-by-Step Solution
Solution:

  1. Step 1: Understand the role of transactions

    Transactions group multiple database operations so they either all succeed or all fail, preventing partial updates.

  2. Step 2: Evaluate the options

    Only They ensure multiple database operations succeed or fail together correctly describes this behavior. The other options describe unrelated or incorrect features.

  3. Final Answer:

    They ensure multiple database operations succeed or fail together -> Option A

  4. Quick Check:

    Transaction purpose = Ensure atomicity [OK]
Quick Trick: Transactions keep database changes all-or-nothing [OK]
Common Mistakes:
  • Thinking transactions speed up queries
  • Confusing transactions with direct database access
  • Believing transactions replace indexes

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