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A "parameterized" SQL request is when you specify a question-mark parameter marker in place of an expression within the SQL request text. Parameter markers are recommended over SQL literals for a couple of reasons.

  1. Because the SQL request text stays the same as the SQL request is executed multiple times, the Teradata Database statement cache hit ratio can be higher, resulting in better performance.
  2. They help protect against SQL injection attacks.

The Teradata JDBC Driver provides both forward-only and scrollable result sets. With a forward-only result set, an application can only fetch rows in the forward direction, using the ResultSet.next method. A scrollable result set enables an application to fetch rows in any order.

Since a scrollable result set offers significantly more functionality than a forward-only result set, application developers may wonder whether there is a performance penalty for using a scrollable result set.