SQL for Java Devs – Page 3 – Sharp: NCLEX, Java & Python

Java: Transactions

What are isolation levels in JDBC and why are they important?

What happens when auto-commit mode is enabled in JDBC?

How do isolation levels affect transaction performance in JDBC?

Why might an exception occur when using transactions in JDBC?

Why do teams use transactions in JDBC for e-commerce operations in production code?

What design considerations should you make for JDBC transactions in a high-concurrency environment?

What happens if a ResultSet column is missing in manual ORM?

How can you iterate backwards through a ResultSet?

How would you explain a trade-off of using TYPE_SCROLL_INSENSITIVE ResultSet in an interview?

Why is it risky to use rs.getString() for non-string columns?