Multiple choice technology databases

Which of the following isolation levels will lock all rows scanned to build a result data set?

  1. Uncommitted Read

  2. Cursor Stability

  3. Read Stability

  4. Repeatable Read
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D Correct answer
Explanation

Repeatable Read (RR) isolation level locks all rows that are scanned to build the result set, preventing other transactions from modifying those rows. Uncommitted Read (UR) doesn't lock rows, Cursor Stability (CS) locks only the current row, and Read Stability (RS) locks only rows that are actually returned, not all scanned rows.

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