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The client issues a request to the STS provider for a security context token using a proxy class method called IssueSecurityContextTokenAuthenticated. Listing 8-12 shows a modified code listing for the RequestSecurityContextToken method, which encapsulates all of the details for generating a security context token. This code listing is included in the sample solution, within the WSSecureConvClient project. For clarity, I have omitted try-catch exception blocks, exception handling, and caching code, which I will discuss later in the chapter. Listing 8-12. Generating a Security Context Token Using the STS Provider s Client Proxy Class

1 2 ... 342,023

123 456 ... 987

private SecurityContextToken RequestSecurityContextToken( StockTraderServiceWse serviceProxy, StockTraderClient client) { // Step 1: Create a signing (security) token to use as // the base for the security context token // The security context token (SCT) will be issued later // by the security token service (STS) SecurityToken token = client.GetSTSRequestSigningToken(); // Step 2: Create a SecurityContextTokenServiceClient (STSClient) // that will get the SecurityContextToken string secureConvEndpoint = ConfigurationSettings.AppSettings["tokenIssuer"]; SecurityContextTokenServiceClient STSClient = new SecurityContextTokenServiceClient(new Uri( secureConvEndpoint )); // Step 3: Retrieve the server certificate, to include in the signed request // to the security token service (STS) SecurityToken issuerToken = client.GetServerToken(); // Step 4: Request the security context token, use the client's // signing token as the base SecurityContextToken sct = STSClient.IssueSecurityContextTokenAuthenticated(token, issuerToken); return sct; }

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Now, our select statement starts executing and reads row 1, row 2, and so on. At some point while we are in the middle of the query, a transaction moves $400.00 from account 123 to account 987. This transaction does the two updates, but does not commit. The table now looks as shown in Table 7-3. Table 7-3. ACCOUNTS Table During Modifications

1 2 ... 342,023

The STS provider s proxy method IssueSecurityContextTokenAuthenticated requires two security tokens: a token to sign the request (token), and a token to encrypt the request (issuerToken). The STS provider generates a security context

123 456 ... 987

So, two of those rows are locked If anyone tried to update them, that user would be blocked So far, the behavior we are seeing is more or less consistent across all databases The difference will be in what happens when the query gets to the locked data When the query we are executing gets to the block containing the locked row (row 342,023) at the bottom of the table, it will notice that the data in the row has changed since the time at which it started execution To provide a consistent (correct) answer, Oracle will at this point create a copy of the block containing this row as it existed when the query began That is, it will read a value of $10000, which is the value that existed at the time the query began.

Effectively, Oracle takes a detour around the modified data it reads around it, reconstructing it from the undo (also known as a rollback) segment (discussed in detail in 9) A consistent and correct answer comes back without waiting for the transaction to commit Now, a database that allowed a dirty read would simply return the value it saw in account 987 at the time it read it, in this case $50000 The query would count the transferred $400 twice Therefore, it not only returns the wrong answer, but also returns a total that never existed in the table at any point in time In a multiuser database, a dirty read can be a dangerous feature and, personally, I have never seen the usefulness of it Say that, rather than transferring, the transaction was actually just depositing $40000 in account 987 The dirty read would count the $400.

token, which factors in the client s security token (token) that signs the STS provider request. The IssueSecurityContextTokenAuthenticated method may be called synchronously (as shown in Listing 8-12) or asynchronously. The synchronous method is preferable because the Web service calls will not be able to proceed anyway in the event that a security context token is not returned. So it is best to wait for the synchronous call to complete, and then to branch directly to an error handler in the event there is a problem.

00 and get the right answer, wouldn t it Well, suppose the uncommitted transaction was rolled back We have just counted $40000 that was never actually in the database The point here is that dirty read is not a feature; rather, it is a liability In Oracle, it is just not needed You get all of the advantages of a dirty read (no blocking) without any of the incorrect results..

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