Multiple choice technology databases

When you open a cursor, DB2 will always get all rows that meet the selection criteria and create a result set?

  1. Yes

  2. No

  3. It Depends

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DB2 does not materialize the entire result set when a cursor is opened. It uses deferred fetch operations, retrieving rows on-demand rather than all at once, which improves memory efficiency and performance.

AI explanation

Opening a cursor in DB2 doesn't necessarily materialize the entire result set immediately — the database can use lazy or incremental evaluation, fetching and computing rows as they're requested via subsequent FETCH statements, especially for large or complex queries. This lets DB2 optimize performance and memory usage rather than eagerly computing every row up front, so the correct answer is that it does not always do so.

Keep practicing — related questions