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Adding a column to a table is a very straightforward operation. You simply use the ALTER TABLE command to add a column to a table, as shown here: SQL> ALTER TABLE emp ADD (retired char(1)); Table altered. SQL>

You can drop an existing column from a table by using the following command: SQL> ALTER TABLE emp DROP (retired); Table altered. SQL> If the table from which you re dropping the column contains a large amount of data, you can ask Oracle to merely mark the column as unused, without trying to remove the data at all. You won t see the column in any queries or views, and all dependent objects, such as constraints and indexes, defined on the column are removed. For all practical purposes, you can drop a large column this way very quickly. Here s an example that marks as unused the hiredate and mgr columns in the emp table: SQL> ALTER TABLE emp SET UNUSED (hiredate, mgr); During a maintenance window, you can then permanently drop the two columns by using the following command: SQL> ALTER TABLE emp DROP UNUSED COLUMNS; If you think that the large number of rows in a table could potentially exhaust the undo space, you can drop a column with the optional CHECKPOINT clause. This will reduce the generation of undo data while dropping the column by applying checkpoints after a certain number of rows. Here s an

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To get an idea of the impact on performance of changing fetch size, I wrote a benchmark program, BenchmarkPrefetch, that finds the elapsed time of a query retrieving 50,000 rows from t1. This program extends the utility class JBenchmark discussed in the section Timing Java Programs in 1. The program begins with import statements, getting a connection and invoking the method _runBenchmark(): /* This program benchmarks the impact of prefetch on a query. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0, and 9.2.0.1.0 */ import java.sql.ResultSet; import java.sql.SQLException; import java.sql.CallableStatement; import java.sql.Connection; import oracle.jdbc.OracleTypes; import book.util.JDBCUtil; import book.util.JBenchmark; class BenchmarkPrefetch extends JBenchmark { public static void main(String args[]) { Connection conn = null; try { conn = JDBCUtil.getConnection("benchmark", "benchmark", "ora10g"); new BenchmarkPrefetch()._runBenchmark( conn );

example that makes the database apply a checkpoint each time it removes 10,000 rows in the emp table: SQL> ALTER TABLE emp DROP UNUSED COLUMNS CHECKPOINT 10000;

You can easily rename table columns using the rename column command. For example, the following command will rename the retired column in the emp table to non_active. Note that you can also rename the column constraints, if you wish. SQL> ALTER TABLE emp RENAME COLUMN retired TO non_active; Table altered. SQL>

} catch (Exception e) { // handle the exception properly - in this case, we just // print the stack trace. JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( conn ); } } // end of main() The following method, _runBenchmark(), prepares the statement to run our query that retrieves 50,000 rows. Before running the query, we start the SQL trace by invoking the method JDBCUtil.startTrace(). The query runs through a number of executions, each time retrieving a total of 50,000 rows using a given fetch size. The static array s_fetchSizes (declared later) defines all fetch sizes this program will benchmark our query on. Inside the loop, we find out the time taken by passing the fetch size information in an object array to the method timeMethod() inherited from JBenchmark: private void _runBenchmark( Connection conn ) throws Exception { String stmtString = "{ call prefetch_pkg.get_details ( , , ) }"; try { s_cstmt = conn.prepareCall( stmtString ); JDBCUtil.startTrace( conn ); for( int i=0; i < s_fetchSizes.length; i++ ) { Integer fetchSize = new Integer ( s_fetchSizes[i] ); timeMethod( JBenchmark.FIRST_METHOD, conn, new Object[]{fetchSize}, "Fetch Size: " + fetchSize ); } } finally { JDBCUtil.close( s_cstmt ); } } We override the method firstMethod() to execute our query for a given fetch size. Note that we once again put the fetch size inside a dummy hint that acts as our SQL tag: public void firstMethod( Connection conn, Object[] parameters ) throws Exception { ResultSet rset = null; Integer fetchSize = (Integer) parameters[0];

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