Is it mandatory to use transactions when performing write operations in a database?

Transactions are not always mandatory but are highly recommended when performing write operations to a database to ensure:

• Atomicity — all operations within a transaction are completed fully or not at all.
• Consistency — data remains in a correct state.
• Isolation — parallel transactions do not affect each other.
• Durability — after a transaction is committed, changes are saved.

Without transactions, failures or errors can lead to partially completed operations and inconsistent data.

Example in Java using JDBC:

connection.setAutoCommit(false);
try {
    // Performing multiple write operations
    statement.executeUpdate(sql1);
    statement.executeUpdate(sql2);
    connection.commit();
} catch (SQLException e) {
    connection.rollback();
}

Thus, transactions ensure data reliability and integrity.