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benchmark@ORA10G> alter session set isolation_level=read committed; Session altered. The differences between using set transaction... and alter session set isolation_level... are as follows. The first difference, of course, is that when we use alter session set isolation_level, we can only change the isolation level to either SERIALIZABLE or READ COMMITTED (the default). Using set transaction..., we can change the isolation level to READ ONLY in addition to these isolation levels. The second, subtler difference is that set transaction... changes settings at a transaction level only. At the end of the transaction (i.e., after a commit or a rollback), the settings revert back to the default (READ COMMITTED). So if we are not using the default of READ COMMITTED, we have to reset the transaction again at the beginning of each transaction, incurring a round-trip even if we are in the same session. In contrast, alter session set isolation_level... works at the session level. Thus, all transactions for the same session are impacted by the change and retain the settings. It follows that if, using the same session, we need to have multiple transactions involving nondefault transaction mode, we save one round-trip per transaction if we use alter session set isolation_level.... Since JDBC implements the method setTransactionIsolation() internally using alter session set isolation_level..., this is the behavior we should expect. Thus, if we use set transaction... to set the transaction isolation level to READ ONLY via JDBC (as we will do soon), we should be aware that we will have to set it at the beginning of each transaction if required, even if we use the same Connection object for each such transaction. The following DemoTransactionIsolationLevels class demonstrates how to set the transaction isolation level to different permissible values for an Oracle database transaction. Please see the interspersed comments for an explanation of the class. /* This class demonstrates how to set different transaction levels in Oracle. * COMPATIBLITY NOTE: tested against 10.1.0.2.0. and 9.2.0.1.0 */ import java.sql.Connection; import java.sql.CallableStatement; import java.sql.SQLException; import book.util.JDBCUtil; class DemoTransactionIsolationLevels { public static void main( String[] args ) throws Exception { Connection conn = null; try { Inside the try catch block, we first get the connection using the JDBCUtil.getConnection() method (explained in the section Introducing JDBCUtil of 3): conn = JDBCUtil.getConnection( "scott", "tiger", args[0] );
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Next, we get and print the transaction isolation level. Since we haven t changed it yet, this will be the default transaction level (i.e., READ COMMITTED). The method getTransactionIsolationDesc() simply translates each of the standard constants into a descriptive text (as you ll see in its definition at the end of this program): int txnIsolationLevel = conn.getTransactionIsolation(); System.out.println( "Default transaction isolation level: " + _getTransactionIsolationDesc( txnIsolationLevel ) ); We then proceed to set the transaction isolation level to SERIALIZABLE, and print a description of it again to end the first try catch block. We close the connection in the finally clause: conn.setTransactionIsolation( Connection.TRANSACTION_SERIALIZABLE ); txnIsolationLevel = conn.getTransactionIsolation(); System.out.println( "transaction isolation level is now " + _getTransactionIsolationDesc( txnIsolationLevel ) ); } finally { JDBCUtil.close( conn ); } So far we have set the transaction isolation level to the two values that have direct JDBC API support (through the setTransactionIsolation() method and defined constants in the Connection interface). Since there is no constant in the Connection interface corresponding to the Oracle-specific isolation level of READ ONLY, we need to use a procedural call (a PL/SQL anonymous block) using the CallableStatement interface (the CallableStatement interface is discussed in detail in 6). In the anonymous block, we invoke the set transaction read only command discussed earlier. First, we declare a String variable containing the PL/SQL anonymous block, and then we declare a CallableStatement variable outside the try catch block: String stmtString = "begin set transaction read only; end;"; CallableStatement cstmt = null; try { We then obtain a connection: conn = JDBCUtil.getConnection( "scott", "tiger", "ora10g" ); Next, we prepare and execute the CallableStatement, thus setting the transaction isolation level to READ ONLY: System.out.println( "Setting the transaction isolation level to READ ONLY"); cstmt = conn.prepareCall( stmtString ); cstmt.execute();
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