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You enable session cached cursors by setting the parameter session_cached_cursors to the size of cache that you need (the default value is 0). Here size denotes the number of cursors you want to cache. You can do this either at the system level using the init.ora parameter session_cached_cursors, or at the session level using the alter session command. The public method setSessionCachedCursors() in the utility class JDBCUtil shown in the following code sets the session cursor cache size equal to the int parameter passed to it: public static void setSessionCachedCursors ( Connection connection, int sessionCachedCursors ) throws SQLException { String stmtStr = "alter session set session_cached_cursors=" + sessionCachedCursors ; Statement stmt = null; try { stmt = connection.createStatement();
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stmt.execute( stmtStr ); } finally { stmt.close(); } } We are now ready to demonstrate the impact of session cursor cache. First, we create a simple table, t1, with just one numeric column in which we insert the numbers 1 to 10,000: benchmark@ORA10G> create table t1 as 2 select rownum as x 3 from all_objects 4 where rownum <= 10000; Table created. benchmark@ORA10G> select count(*) from t1; COUNT(*) ---------10000 The following DemoSessionCachedCursors class compares two cases: Case 1: We run the select from table t1 10,000 times with session cached cursors set to 0. Case 2: We run the select from table t1 10,000 times with session cached cursors set to 500. /** This program demonstrates the impact of session cursor cache. * COMPATIBLITY NOTE: * runs successfully against 9.2.0.1.0 and 10.1.0.2.0 */ import java.sql.SQLException; import java.sql.ResultSet; import java.sql.Connection; import java.sql.PreparedStatement; import book.util.JDBCUtil; import book.util.JRunstats; class DemoSessionCachedCursors { public static void main(String args[]) throws Exception { Connection conn = null; // first parameter: database name try { // get connection - auto commit is off conn = (Connection) JDBCUtil. getConnection("benchmark", "benchmark", args[0]);
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We will use the JRunstats utility class (discussed in the section JDBC Wrapper for runstats of 1) for comparing the two cases. We begin by preparing the benchmark statements in the class JRunstats: JRunstats.prepareBenchmarkStatements ( conn ); We mark the beginning of the benchmark run next: JRunstats.markStart ( conn ); We set the session cached cursors to 0 in the first scenario, effectively disabling it: JDBCUtil.setSessionCachedCursors( conn, 0 ); We execute the following query from t1 10,000 times (we don t need to retrieve the results for our test case): String stmtString = "select x from t1"; PreparedStatement pstmt = null; ResultSet rset = null; for( int i=0; i < 10000; i++ ) { try { pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } }
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Note As you ll learn later, you can t use a static cursor for this benchmark, as static cursors are cached
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by PL/SQL themselves, thus undermining the test results. You have to use a ref cursor.
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We then mark the beginning of the second scenario by invoking the method markMiddle(): JRunstats.markMiddle ( conn ); We now set the session cached cursors to 500 and execute the second scenario. We finally print out the results by invoking JRunstats.markEnd() to end our program: JDBCUtil.setSessionCachedCursors( conn, 500 ); stmtString = "select x from t1"; PreparedStatement pstmt1 = null;
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ResultSet rset1 = null; for( int i=0; i < 10000; i++ ) { try { pstmt1 = conn.prepareStatement( stmtString ); rset1 = pstmt1.executeQuery(); } finally { // release resources associated with JDBC in the finally clause. JDBCUtil.close( rset1 ); JDBCUtil.close( pstmt1 ); } } JRunstats.markEnd ( conn ); } finally { // release resources associated with JDBC in the finally clause. JRunstats.closeBenchmarkStatements ( conn ); JDBCUtil.close( conn ); } } }// end of program When we execute the program, we get the following results: B:\>java DemoSessionCachedCursors URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) ------- Benchmark Results -------Results from RUNSTATS utility Run1 ran in 1311 hsecs Run2 ran in 1230 hsecs run 1 ran in 106.59% of the time Name STAT...opened cursors current <-- trimmed to save space --> Run1 Run2 0 Diff 1 1
Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 356,675 224,755 -131,920
158.70%
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