Question

What is the concept of Nonrepeatable Read in database management systems?

1) A situation where a transaction reads the same data multiple times and each time it gets a different value.
2) A situation where a transaction reads the same data multiple times and each time it gets the same value.
3) A situation where a transaction reads the data and then updates it, causing other transactions to see different values.
4) A situation where a transaction reads the data and then updates it, causing other transactions to see the same value.

Answer 1

Nonrepeatable Read is a concept in database management systems where a transaction reads the same data multiple times and gets a different value each time.

Step-by-step explanation:

Nonrepeatable Read is a concept in database management systems where a transaction reads the same data multiple times, and each time it gets a different value. This can happen when another transaction modifies the data between the readings. This phenomenon is often caused by concurrent transactions in a multi-user environment.