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<address_line2/> <city>Redmond</city> <region_name>Washington</region_name> <postal_code>12345</postal_code> <tel_number>019182782</tel_number> <tel_extension/> <isbilling>1</isbilling> </generalinfo> </address> <getcatalogsforuser> <selectiontitle>Browse Catalogs:</selectiontitle> <catalog> <catalogname>Books</catalogname> <catalognameurl>Books</catalognameurl> </catalog> <catalog> <catalogname>Hardware</catalogname> <catalognameurl>Hardware</catalognameurl> </catalog> </getcatalogsforuser> <profile auth="auth"/> <exceptions></exceptions> </page>
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and deployed using only page-level locking. If they were well designed and tuned, concurrency was not an issue, and some of these applications supported hundreds of active user connections with acceptable response times and throughput. However, with the change in page size from 2 KB to 8 KB for SQL Server 7.0, the issue has become more critical. Locking an entire page means locking four times as much data as in previous versions. Beginning with SQL Server 7.0, the software implements full row-level locking, so any potential problems due to lower concurrency with the larger page size should not be an issue. However, locking isn t free. Resources are required to manage locks. Recall that a lock is an in-memory structure of 64 or 128 bytes (for 32-bit or 64-bit machines, respectively) with another 32 or 64 bytes for each process holding or requesting the lock. If you need a lock for every row and you scan a million rows, you need more than 64 MB of RAM just to hold locks for that one process. Beyond memory consumption issues, locking is a fairly processing-intensive operation. Managing locks requires substantial bookkeeping. Recall that, internally, SQL Server uses a lightweight mutex called a spinlock to guard resources, and it uses latches also lighter than full-blown locks to protect non-leaf level index pages. These performance optimizations avoid the overhead of full locking. If a page of data contains 50 rows of data, all of which are used, it is obviously more ef cient to issue and manage one lock on the page than to manage 50. That s the obvious bene t of page locking a reduction in the number of lock structures that must exist and be managed. Let s say two processes each need to update a few rows of data, and even though the rows are not the same ones, some of them happen to exist on the same page. With page-level locking, one process would have to wait until the page locks of the other process were released. If you use row-level locking instead, the other process does not have to wait. The ner granularity of the locks means that no con ict occurs in the rst place because each process is concerned with different rows. That s the obvious bene t of row-level locking. Which of these obvious bene ts wins Well, the decision isn t clear-cut, and it depends on the application and the data. Each type of locking can be shown to be superior for different types of applications and usage. The ALTER INDEX statement lets you manually control the unit of locking within an index with options to disallow page locks or row locks within an index. Because these options are available only for indexes, there is no way to control the locking within the data pages of a heap. (But remember that if a table has a clustered index, the data pages are part of the index and are affected by a value set with ALTER INDEX.) The index options are set for each table or index individually. Two options, ALLOW_ROW_LOCKS and ALLOW_PAGE_LOCKS, are both set to ON initially for every table and index. If both of these options are set to OFF for a table, only full table locks are allowed. As mentioned earlier, during the optimization process, SQL Server determines whether to lock rows, pages, or the entire table initially. The locking of rows (or keys) is heavily favored. The type of locking chosen is based on the number of rows and pages to be scanned, the number of rows on a page, the isolation level in effect, the update activity going on, the number of users on the system needing memory for their own purposes, and so on.
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The preceding code sets the page s IsValid property to false if the text box contains anything other than Dino. However, this fact alone doesn t prevent the transition to the target page. In other words, you could still have invalid input data posted to the target page. Fortunately, this issue has an easy workaround, as shown in the following code:
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Figure 7-1 Add Reference. . . menu choice from the Debugger project
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In this exercise, you view reports in the Print Preview window and then edit their formats to include additional information.
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couldn t call the AddInterest method using the selectedAccount variable. You ll see how to do that in the next section. 34. Press F5 to run the application. Make some deposits and withdrawals with the accounts, and you ll see the common and specialized behaviors of the CheckingAccount and SavingsAccount classes. Find the type of the object 1. Open Form1 in the designer. 2. Add another button to Form1. Set its Name property to addInterest, its Text property to Add interest, and its Visible property to False. 3. Double-click the button to create the Click event method in the code editor. 4. In the form designer, double-click the account ComboBox control to create the account_SelectedIndexChanged method in the code editor. 5. Add the following code to the account_SelectedIndexChanged method to display the Add Interest button if the selected account is the savings account. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. } } else { addInterest.Visible = false; // Visual C# private void account_SelectedIndexChanged(object sender, System.EventArgs e) { if (account.SelectedItem is SavingsAccount) { addInterest.Visible = true; Visual Basic Private Sub account_SelectedIndexChanged(ByVal sender As _ System.Object, ByVal e As System.EventArgs) _ Handles account.SelectedIndexChanged If TypeOf (account.SelectedItem) Is SavingsAccount Then addInterest.Visible = True Else addInterest.Visible = False End If End Sub
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The Remote Desktop Connection client comes installed on Windows XP and Windows Server 2003 systems and can be installed on other platforms such as Windows 2000 Server and workstations. The Remote Desktop Connection client installation software is available for the following operating systems: Microsoft Windows 95, Windows 98, Windows Millennium Edition (Windows Me), Windows NT 4, and Windows 2000. For these operating systems, you can use these deployment options to make the Remote Desktop Connection client available to remote users:
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format the chart and modify the details in the PivotTable report from which the chart is derived. PivotTable reports are well suited to analyzing and summarizing the large volumes of data that Project plans can contain. You can create Excel visual reports with Excel 2003 or later.
Now that you know more about the Registry s structure, let s take a look at the actual data within the Registry. Understanding how Registry data is stored and used is just as important as understanding the Registry structure.
The System.Collections Namespace
Abbrev. Title
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SQL Server also ensures the consistency of your transactions. Consistency means that all data remains in a consistent state that the integrity of the data is preserved after a transaction finishes, regardless of whether the transaction succeeded or failed. Before a transaction begins, the database must be in a consistent state, which means that the integrity of the data is upheld and that internal structures, such as B-tree indexes and doubly linked lists, are correct. Likewise, after a transaction occurs, the database must be in a consistent state a new state if the transaction succeeded or its pre-transaction state if the transaction failed. Consistency is also a transaction management feature provided by SQL Server. If your data is consistent and your transactions maintain logical consistency and data integrity, SQL Server will ensure the consistency of the data after a transaction. When you are using data replication in a distributed environment, various levels of consistency can be achieved, ranging from eventual transactional convergence, or latent consistency, to immediate transactional consistency. The level of consistency depends on the type of replication you use.
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If found, get its default value. 2nd optional argument is the
The Summary page of the Properties dialog box.
Property Image
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