SQL - Transactions and Data Integrity
Which of the following best describes a
dirty read in database transactions?Which of the following best describes a dirty read in database transactions?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand dirty read definition
A dirty read happens when a transaction reads data that another transaction has changed but not committed yet.Step 2: Compare options to definition
Reading data that has been modified but not yet committed by another transaction. matches this exactly. Seeing new rows appear in a query result after re-running the same query. describes phantom reads, C describes a safe read, and D is about locking, not dirty reads.Final Answer:
Reading data that has been modified but not yet committed by another transaction. -> Option AQuick Check:
Dirty read = reading uncommitted data [OK]
Quick Trick: Dirty read = reading uncommitted changes [OK]
Common Mistakes:
- Confusing dirty read with phantom read
- Thinking dirty read only reads committed data
- Mixing locking with read phenomena
Master "Transactions and Data Integrity" in SQL
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