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A page is an 8-KB unit where SQL Server stores data It can contain table or index data, bitmaps for allocation, free space information, and so on A page is the smallest I/O unit that SQL Server can read or write In older versions of SQL Server (prior to 2005) a row could not span multiple pages and was limited to 8,060 bytes gross (aside from large object data) The limitation was because of the page size (8,192 bytes), which was reduced by the header size (96 bytes), a pointer to the row maintained at the end of the page (2 bytes), and a few additional bytes reserved for future use Starting with SQL Server 2005, a feature called row-over ow data relaxes the limitation on row size for columns of types VARCHAR, NVARCHAR, VARBINARY, SQL_VARIANT, or CLR user-de ned types.

When the row exceeds 8,060 bytes, values of such types can be moved to what are known as row over ow pages, and a 24-byte pointer to the off-row data is maintained in the original page This way, a row can end up spanning multiple pages In-row data is still limited to 8,060 bytes A value of one of the aforementioned types can be moved to row-over ow pages provided that the value size doesn t exceed 8,000 bytes If the size exceeds 8,000 bytes, the value is stored internally as a large object, and a 16-byte pointer to the large object value is maintained in the original row Keep in mind that a page is the smallest I/O unit that SQL Server can read or write.

arrid ---------A A A A B B C C C C C C C C C D D D array ----------------------------------20,223,2544,25567,14 20,223,2544,25567,14 20,223,2544,25567,14 20,223,2544,25567,14 30,-23433,28 30,-23433,28 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 12,10,8099,12,1200,13,12,14,10,9 -4,-6,-45678,-2 -4,-6,-45678,-2 -4,-6,-45678,-2 n ----------3 7 12 18 3 10 3 6 11 14 19 22 25 28 31 3 6 13

Even if SQL Server needs to access a single row, it has to load the whole page to the cache and read it from there Queries that involve primarily data manipulation are typically bound mainly by their I/O cost Of course, a physical read of a page is much more expensive than a logical read of a page that already resides in cache It s hard to come up with a number that would represent the performance ratio between them because several factors are involved in the cost of a read, including the type of access method used, the fragmentation level of the data, and other factors Therefore, I strongly advise against relying on any number as a rule of thumb..

check box. You might find this Aero sans trans approach convenient at times if you need to generate pictures of windows for presentation purposes and don t want the pictures to include distracting behind the scenes material.

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The expression has two parts, prefix and value, and an underlying object, the expression builder. The expression builder decides on the prefix and how to parse and expand the value. The connection string builder accepts a ConnectionString as the prefix and the name of a configuration entry as the value. The expression expands to the following:

This code generates the following output:

To clarify, this feature was introduced with Microsoft Windows 95 and was tailor-made for Windows Explorer. Have you ever noticed that when you have a Windows Explorer view open and you modify a file shown in that view, the Windows Explorer view automatically refreshes to show updated data The trick behind this apparently magical behavior is that, just before a new folder view is opened, Windows Explorer registers a file notification object for the contents of that folder. When it gets a notification that something occurred to that folder's contents, Windows Explorer simply refreshes the view to show the new contents, whatever that is. Later, Microsoft introduced only for the Windows NT platform an even more sophisticated mechanism that not only notifies applications of the event but also provides information about the type of change that occurred and the file or files affected. This extended feature relies on Win32 API functions supported only on Windows NT platforms, starting with Windows NT 4.0. The .NET Framework wraps all this functionality into the FileSystemWatcher class, available from the System.IO namespace. This class takes advantage of the Windows NT-based API and for this reason is not available with Microsoft Windows 98, Microsoft Windows Me, and older platforms. Note Because FileSystemWatcher is a wrapper for the Windows NT API, it works only on computers running Windows NT, Windows 2000, or Windows XP. But you could write a wrapper class using a less powerful Win32 API and have it work on all Win32 platforms.