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simultaneously is the same as if they were run sequentially in the order B, C, and then A. Serializable does not imply that the order is known in advance. The order is considered a chance event. Even on a single-user system, the order of transactions hitting the queue would be essentially random. If the batch order is important to your application, you should implement it as a pure batch system. Serializable means only that there should be a way to run the transactions serially to get the same result you get when you run them simultaneously. Table 10-1 illustrates a case where two transactions cannot be run serially and get the same result. Table 10-2 summarizes the behaviors that are possible in each isolation level and notes the concurrency control model that is used to implement each level. You can see that Read Committed and Read Committed (snapshot) are identical in the behaviors they allow, but the behaviors are implemented differently one is pessimistic (locking), and one is optimistic (row versioning). Serializable and Snapshot also have the same No values for all the behaviors, but one is pessimistic and one is optimistic.

TABLE 10-2

.

Read Uncommitted Read Committed (locking) Read Committed (snapshot) Repeatable Read Snapshot Serializable

1. In Browser.cs, add the ModifyNavigationButtons method, and modify Browser_Load and myBrowser_DocumentCompleted to look like the following:

Locking is a crucial function of any multiuser database system, including SQL Server. Locks are applied in both the pessimistic and optimistic concurrency models, although the way other processes deal with locked data is different in each. The reason I refer to the pessimistic variation of Read Committed isolation as Read Committed (locking) is because locking allows concurrent transactions to maintain consistency. In the pessimistic model, writers always block readers and writers, and readers can block writers. In the optimistic model, the only blocking that occurs is that writers block other writers. But to really understand what these simpli ed behavior summaries mean, we need to look at the details of SQL Server locking.

SQL Server can lock data using several different modes. For example, read operations acquire shared locks, and write operations acquire exclusive locks. Update locks are acquired during the initial portion of an update operation, while SQL Server is searching for the data

10

to update. SQL Server acquires and releases all these types of locks automatically. It also manages compatibility between lock modes, resolves deadlocks, and escalates locks if necessary. It controls locks on tables, on the pages of a table, on index keys, and on individual rows of data. Locks can also be held on system data data that s private to the database system, such as page headers and indexes. SQL Server provides two separate locking systems. The rst system affects all fully shared data and provides row locks, page locks, and table locks for tables, data pages, Large Object (LOB) pages, and leaf-level index pages. The second system is used internally for index concurrency control, controlling access to internal data structures and retrieving individual rows of data pages. This second system uses latches, which are less resource-intensive than locks and provide performance optimizations. You could use full-blown locks for all locking, but because of their complexity, they would slow down the system if you used them for all internal needs. If you examine locks using the sp_lock system stored procedure or a similar mechanism that gets information from the sys.dm_tran_locks view, you cannot see latches you see only information about locks. Another way to look at the difference between locks and latches is that locks ensure the logical consistency of the data and latches ensure the physical consistency. Latching happens when you place a row physically on a page or move data in other ways, such as compressing the space on a page. SQL Server must guarantee that this data movement can happen without interference.

private void Browser_Load(object sender, EventArgs e) { this.tsbBack.Enabled = false; this.tsbForward.Enabled = false; this.lblApplicationStatus.Text = Ready ; } private void ModifyNavigationButtons() { // Add the code to enable or disable whenever there are URLs // in the browsing session s history if (myBrowser.CanGoBack) tsbBack.Enabled = true; else tsbBack.Enabled = false; if (myBrowser.CanGoForward) tsbForward.Enabled = true; else tsbForward.Enabled = false; } private void myBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { // The about box is retrieving this information in a nice clean method // so let s reuse it // If you don t have an about box you can just create this method using // the code from the about box. We don t need to validate if the title // is empty; the method is doing it. // If it s empty it will use the .exe name this.Text = myAboutBox.AssemblyTitle + - + e.Url.Host.ToString(); ModifyNavigationButtons(); this.lblApplicationStatus.Text = Ready ; }