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"end;" ); } The method enable() simply sets the dbms_output size and executes the dbms_output.enable call: public void enable( int size ) throws SQLException { enable_stmt.setInt( 1, size ); enable_stmt.executeUpdate(); } The method disable() executes the dbms_output.disable call: public void disable() throws SQLException { disable_stmt.executeUpdate(); } The method show() does most of the work. It loops over all of the dbms_output data, fetching it in this case 32,000 bytes at a time (give or take 255 bytes). It then prints this output on stdout: public void show() throws SQLException { int done = 0; show_stmt.registerOutParameter( 2, java.sql.Types.INTEGER ); show_stmt.registerOutParameter( 3, java.sql.Types.VARCHAR ); for(;;) { show_stmt.setInt( 1, 32000 ); show_stmt.executeUpdate(); System.out.print( show_stmt.getString(3) ); if ( (done = show_stmt.getInt(2)) == 1 ) break; } } The method close() closes the callable statements associated with the DbmsOutput class: public void close() throws SQLException { enable_stmt.close(); disable_stmt.close(); show_stmt.close(); } }

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A sequence expression generally always begins with for ... in ..., but you can use additional constructs. For example: A secondary iteration: for pattern in seq do seq-expr A filter: if expression then seq-expr A conditional: if expression then seq-expr else seq-expr A let binding: let pattern = expression in seq-expr A final yield: -> expression or yield expression A final yield of another sequence: ->> expression or yield! expression

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Now we re ready to write a Java program that invokes runstats. The class JRunstats shown shortly is a wrapper around runstats. This program does the following: Invokes runstats and prints out the resulting comparison results Prints out the runtime difference between the two approaches being compared, as seen from the Java client (using the System.currentTimeMillis() method) Usually, the runtime difference shown as a result of runstats and the one printed separately by JRunstats should be the same, but the two may differ if a PL/SQL optimization is used that is not available in JDBC layer. Once again the class uses the CallableStatement JDBC class, which is explained in detail in 6: /* This program is a Java wrapper around the runstats utility written * by Tom Kyte and available at http://asktom.oracle.com/~tkyte/runstats.html. */ package book.util; import java.sql.Connection; import java.sql.CallableStatement; import java.sql.SQLException; import java.sql.Statement; public class JRunstats { The method markStart() invokes the method rs_start in the runstats utility. We invoke this method before starting the first of the two approaches we re comparing in a given benchmark run: public static void markStart( Connection connection ) throws SQLException { _startTime = System.currentTimeMillis(); _benchmarkStatementArray[BENCHMARK_START_INDEX].execute(); } The method markMiddle() invokes the method rs_middle in the runstats utility. We invoke this method before starting the second of the two approaches we re comparing in a given benchmark run: public static void markMiddle( Connection connection ) throws SQLException { _middleTime = System.currentTimeMillis(); _benchmarkStatementArray[BENCHMARK_MIDDLE_INDEX].execute(); } The method markEnd() invokes the method rs_stop in the runstats utility. We invoke this method at the end of the benchmark run. The method also takes a threshold that controls the amount of data printed. It results in JRunstats printing only latches and statistics whose