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However, the new updated value of the second row correctly contains the latest value We then run tkprof on the trace file generated by this program (see 1 for details on how to use tkprof) The relevant section from the following tkprof output tells us what the JDBC driver did when we issued the refreshRow() method: select rowid, x from t1 WHERE ( ROWID = :rowid0 OR ROWID = :rowid1 OR ROWID = :rowid2 OR ROWID = :rowid3 OR ROWID = :rowid4 OR ROWID = :rowid5 OR ROWID = :rowid6 ) order by x As you can see, JDBC silently added the pseudo column rowid to obtain the result set when we issued the query When we did a refresh, JDBC issued a query that reselected all seven rows (remember, the fetch size was 7 in our case), starting from the current row, using their rowids.

In the preceding select, :rowid0 stands for the bind variable with the value of first rowid, :rowid1 stands for the bind variable with the value of second rowid, and so on From the results of this query, the JDBC driver repopulated its cache with the new set of rows..

protected void Button1_Click(object sender, EventArgs e) { System.Threading.Thread.Sleep(4000); }

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As already discussed in 4, different transaction isolation levels affect a transaction s behavior. In particular, recall that when we set the transaction isolation level to SERIALIZABLE, all queries are read such that retrieved data is consistent with respect to the beginning of the transaction. In other words, the answers to all queries are fixed as of the beginning of the transaction. A side effect of this behavior is that in a serializable transaction, if you attempt to update the same row as some other user, you wait until the user commits and then get an error. Let s look at an example. We ll execute the following two statements from two different sessions: alter session set isolation_level=serializable; update emp set sal=1450 where ename='MARTIN'; The first statement alters the current session to set the transaction isolation level to SERIALIZABLE. If we open two windows and execute the preceding two statements, first in window 1 and then in window 2, we will see that the window 2 session hangs, waiting for the window 1 session to commit or roll back. Actions in Window 1: scott@ORA10G> alter session set isolation_level=serializable; Session altered. scott@ORA10G> update emp set sal=1450 where ename='MARTIN'; 1 row updated. Actions in Window 2 (hangs after the second command waiting for the window 1 session to commit or roll back): scott@ORA10G> alter session set isolation_level=serializable; Session altered. scott@ORA10G> update emp set sal=1450 where ename='MARTIN';

Now if we commit in window 1, window 2 will give an error: scott@ORA10G> update emp set sal=1450 where ename='MARTIN'; * ERROR at line 1: ORA-08177: can't serialize access for this transaction If window 1 issues a rollback, though, the window 2 session s update will succeed Setting the transaction isolation level just to solve the lost update problem is usually not feasible for the following reasons: In most web applications, you grab a connection from a connection pool for each HTTP request Since the transaction isolation level is associated with a connection, you can use the previous technique only if the select that displayed the record and the update that followed are using the same exact connection.

When you run the page and click the Calculate button, you ll see that the string, Calculating appears for four seconds and then disappears as shown in Figure 5-11.

Since the connection may change with each request, and since the query and the update would be performed in two separate requests, setting the transaction isolation level to solve the lost update problem simply will not work Such an environment, in which you are not maintaining the same database connection across multiple user requests, is termed a stateless environment This is not true in client/server applications where a user has a dedicated database session for the entire user interaction Such an environment is called a stateful environment Thus, setting the transaction isolation level to SERIALIZABLE is an option only in stateful environments Another important point to note is that changing the transaction isolation level has a huge impact on the way DML statements behave Most transactions require the use of the default isolation level of READ COMMITTED.

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