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The next method, _demoQueryWithCallableStmt(), retrieves a ref cursor that contains the object column values. All the steps for converting the object into a Struct and retrieving individual values are exactly the same as in the case of the method _demoQueryWithPreparedStmt() discussed earlier. private static void _demoQueryWithCallableStmt( Connection conn, String stmtStr ) throws SQLException { CallableStatement cstmt = null; ResultSet rset = null; try { cstmt = conn.prepareCall( stmtStr ); cstmt.registerOutParameter( 1, OracleTypes.CURSOR ); cstmt.execute(); rset = (ResultSet) cstmt.getObject(1); while( rset.next() ) { Struct itemStruct = (Struct) rset.getObject ( 1 ); Object[] attributes = itemStruct.getAttributes(); System.out.println ( "num of attributes: " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { System.out.println ( "class of attribute " + i + " = " + (attributes[i]).getClass().getName() + ", value = " + attributes[i] ); } } } finally { // release resources in the finally clause. JDBCUtil.close( rset); JDBCUtil.close( cstmt); } }

One of the first things you can do to measure instance performance efficiency is to determine the proportion of total time the database is spending working compared to the proportion of time it s merely waiting for resources. The V$SYSMETRIC view displays the system metric values for the most current time interval. The following query using the V$SYSMETRIC view reveals a database instance where waits are taking more time than the instance CPU usage time: SQL> SELECT METRIC_NAME, VALUE FROM V$SYSMETRIC WHERE METRIC_NAME IN ('Database CPU Time Ratio', 'Database Wait Time Ratio') AND INTSIZE_CSEC = (select max(INTSIZE_CSEC) from V$SYSMETRIC); METRIC_NAME -----------------------Database Wait Time Ratio Database CPU Time Ratio SQL> VALUE -----72 28

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Once you realize that the total instance wait time ratio is much higher than the CPU time ratio, you can explore things further. Wait classes provide a quick way to figure out why the database instance is performing poorly. In the example shown in Listing 20-14, you can easily see that user I/O waits are responsible for most of the wait time. You can establish this fact by looking at the PCT_TIME column, which gives you the percentage of time attributable to each wait class. Total waits are often misleading, as you can see by looking at the NETWORK wait class. In percentage terms, network waits are only 1 percent, although total network waits constitute more than 51 percent of total waits in this instance. Listing 20-14. Determining Total Waits and Percentage Waits by Wait Class SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16* SELECT WAIT_CLASS, TOTAL_WAITS, round(100 * (TOT_WAITS / SUM_WAITS),2) PCT_TOTWAITS, ROUND((TIME_WAITED / 100),2) TOT_TIME_WAITED, round(100 * (TOT_TIME_WAITED / SUM_TIME),2) PCT_TIME FROM (select WAIT_CLASS, TOT_WAITS, TOT_TIME_WAITED FROM V$SYSTEM_WAIT_CLASS WHERE WAIT_CLASS != 'Idle'), (select sum(TOT_WAITS) SUM_WAITS, sum(TOT_TIME_WAITED) SUM_TIME from V$SYSTEM_WAIT_CLASS where WAIT_CLASS != 'Idle') ORDER BY PCT_TIME DESC;

WAIT_CLASS TOTAL_WAITS ------------- ----------User I/O 6649535191 Other 394490128 Concurrency 78768788 Network 7546925506 Application 2012092 Commit 15526036 Configuration 12898465 System I/O 53005529 Administrative 25 Scheduler 1925 10 rows selected. SQL>

The method _demoStructWithCallableStmtGivesError() tries to invoke a procedure that returns an item object directly as an out parameter (using the procedure item_pkg.get_item()) instead of returning it as a column of a ref cursor. It gives an error, as you will see shortly: private static void _demoStructWithCallableStmtGivesError( Connection conn, String stmtStr ) throws SQLException { CallableStatement cstmt = null; try { cstmt = conn.prepareCall( stmtStr ); cstmt.registerOutParameter( 1, OracleTypes.STRUCT ); cstmt.execute(); // get the "item" object and its attributes Struct itemStruct = (Struct) cstmt.getObject ( 1 ); Object[] attributes = itemStruct.getAttributes(); System.out.println ( "num of attributes: " + attributes.length ); for(int i=0; i < attributes.length; i++ ) { System.out.println ( "class of attribute " + i + " = " + (attributes[i]).getClass().getName() + ", value = " + attributes[i] ); } } finally { // release resources in the finally clause. JDBCUtil.close( cstmt); } } } // end of program

PCT_TOT_WAITS ------------45.07 2.67 .53 51.15 .01 .11 .09 .36 0 0

Router1#show ntp associations detail 172.16.21.1 configured, authenticated, our_master, sane, valid, stratum 8 ref ID 127.127.7.1, time C745D7EF.B258F1CC (22:40:47.696 UTC Sat Dec 10 2005) our mode client, peer mode server, our poll intvl 64, peer poll intvl 64 root delay 0.00 msec, root disp 0.03, reach 377, sync dist 5.661 delay 9.75 msec, offset -2.7284 msec, dispersion 0.76 precision 2**19, version 3 org time C745D815.02640D80 (22:41:25.009 UTC Sat Dec 10 2005) rcv time C745D815.0456D293 (22:41:25.016 UTC Sat Dec 10 2005) xmt time C745D815.018EACBC (22:41:25.006 UTC Sat Dec 10 2005) filtdelay = 9.75 9.75 9.78 9.83 10.16 9.80 9.83 9.77 filtoffset = -2.73 -2.22 -1.95 -1.37 -1.45 -1.22 -1.42 -2.03 filterror = 0.02 0.99 1.97 2.94 3.92 4.90 5.87 6.85 Router1#

TOT_TIME_WAITED PCT_TIME --------------- -------46305770.5 84.42 5375324.17 9.8 1626254.9 2.96 547128.66 1 449945.5 .82 351043.3 .64 116029.85 .21 78783.64 .14 7.6 0 .15 0

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