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_demoDelete( conn ); conn.commit(); } catch (SQLException e) { // handle the exception properly - in this case, we just // print a message and roll back JDBCUtil.printExceptionAndRollback( conn, e ); } finally { // release JDBC resources in the finally clause. JDBCUtil.close( conn ); } } After getting the connection, the main() method invokes three private methods: demoInsert(): Demonstrates inserting data demoUpdate(): Demonstrates updating data, and binds parameters by name demoDelete(): Demonstrates deleting data The method _demoInsert() begins by preparing a statement to insert a row into t1: // demo insert private static void _demoInsert( Connection conn ) throws SQLException { PreparedStatement pstmt = null; try { // prepare the statement pstmt = conn.prepareStatement( "insert into t1 values ( , , )"); Next, we bind the values for the three columns x, y, and z: pstmt.setInt(1, 5 ); // bind the value 5 to the first placeholder pstmt.setString(2, "string 5" ); pstmt.setDate(3, new java.sql.Date( new java.util.Date().getTime())); We execute the statement using the executeUpdate() method, which returns the number of rows inserted. We print out the number of rows inserted and close the prepared statement to end the method: int numOfRowsInserted = pstmt.executeUpdate(); System.out.println( "Inserted " + numOfRowsInserted + " row(s)" ); } finally { // release JDBC related resources in the finally clause.

3. Use the ALTER DATABASE RENAME datafile TO command to rename the file within the control file (you must rename the database after renaming the file): SQL> ALTER DATABASE RENAME '/u10/app/oracle/oradata/nina/log01.rdo' TO '/a10/app/oracle/oradata/nina/log01.rdo';

You can drop an entire redo log group by using the following command: SQL> ALTER DATABASE DROP LOGFILE GROUP 3; To drop a single member of an online redo log group, use this command: SQL> ALTER DATABASE DROP LOGFILE MEMBER '/u01/app/oracle/oradata/nina/log01.rdo'; If the redo log file you want to drop is active or current, Oracle won t let you drop it. You need to use the following command to switch the log file first, after which you can drop it: SQL> ALTER SYSTEM SWITCH LOGFILE;

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You can set the DB_BLOCK_CHECKSUM initialization parameter to on to make sure Oracle checks for corruption in the redo logs before they re archived. If the online redo logs are corrupted, the file can t be archived, and one solution is to just drop and re-create them. But if there are only two log groups, you can t do this, as Oracle insists on having a minimum of two online redo log groups at all times. However, you can create a new (third) redo log group, and then drop the corrupted redo log group. Also, you can t drop an online redo log file if the log file is part of the current group. Your strategy then would be to reinitialize the log file by using the following statement: SQL> ALTER DATABASE CLEAR LOGFILE GROUP 1; If the log group has not been archived yet, you can use the following statement: SQL> ALTER DATABASE CLEAR UNARCHIVED LOGFILE GROUP 1;

JDBCUtil.close( pstmt ); } } The _demoUpdate() method updates one row of table t1. We use binding by parameter name this time. The method begins by creating a prepared statement and casting it to the OraclePreparedStatement interface: // demo update use bind by name private static void _demoUpdate( Connection conn ) throws SQLException { OraclePreparedStatement opstmt = null; try { // prepare the statement opstmt = (OraclePreparedStatement) conn.prepareStatement( "update t1 set y = :y where x = :x"); We bind the two named parameters x and y next: // bind the values by name. opstmt.setStringAtName("y", "string 1 updated" ); opstmt.setIntAtName("x", 1 ); The process of executing the statement is the same as that in the case of _demoInsert(): // execute the statement int numOfRowsUpdated = opstmt.executeUpdate(); System.out.println( "Updated " + numOfRowsUpdated + " row(s)" ); } finally { // release JDBC-related resources in the finally clause. JDBCUtil.close( opstmt ); } } We end the program with the _demoDelete() method, which is similar to the _demoInsert() method: // demo delete private static void _demoDelete( Connection conn ) throws SQLException { PreparedStatement pstmt = null; try { // prepare the statement pstmt = conn.prepareStatement( "delete from t1 where x = "); // bind the values pstmt.setInt(1, 2 );

You can use two key dynamic views, V$LOG and V$LOGFILE, to monitor the online redo logs. The V$LOGFILE view provides the full filename of the redo logs, their status, and type, as shown here: SQL> SELECT * FROM V$LOGFILE; GROUP # STATUS TYPE --------------- -----3 STALE ONLINE 2 ONLINE 1 ONLINE 3 rows selected. MEMBER -------------------------------------/u10/app/oracle/oradata/nina/log01.rdo /u10/app/oracle/oradata/nina/log01.rdo /u10/app/oracle/oradata/nina/log01.rdo

The V$LOG view gives detailed information about the size and status of the redo logs, as well as showing whether the logs have been archived: SQL> SELECT group#, sequence#, bytes, archived, members, status 2* FROM V$LOG; GROUP# SEQUENCE# BYTES ARCHIVED MEMBERS STATUS ---------- ---------- ---------- --- ---------- ------------1 8 104857600 NO 1 INACTIVE 2 10 104857600 NO 1 CURRENT 3 7 104857600 NO 1 INACTIVE 4 9 10485760 NO 3 INACTIVE SQL>

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