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locks can prevent scalability if they re held for longer than absolutely necessary. For this reason, you shouldn t hold the database transaction (or even the JDBC connection) open while waiting for user input. (All this, of course, also applies to a Hibernate Transaction, since it s merely an adaptor to the underlying database transaction mechanism.) If you want to handle long user think time while still taking advantage of the ACID attributes of transactions, simple database transactions aren t sufficient. You need a new concept, long-running application transactions.

@Override public void onOpen(SQLiteDatabase db) { super.onOpen(db); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS " + DBHelper.DB_TABLE); onCreate(db); } }

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Appendix C contains a list of commonly captured Performance Monitor counters, and in chapter 17, we ll focus on a performance-tuning methodology that measures various counters in combination with a number of wait types. The focus of the chapter thus far has been on monitoring tools and reports. As any experienced DBA knows, spending all day manually monitoring a large number of server instances is both mind numbing and only moderately successful, if at all possible. Together with good configuration settings and proactive management, an exception-based management approach is required for large environments, and fortunately there are a number of automation and alert techniques that we can employ to do most of the monitoring for us, freeing up time for more important and/or rewarding tasks.

Similarly, if you print using the Microsoft XPS Document print driver (a great test driver), you ll see that it has no enforced margins, and therefore provides a size of 816 x 1056. If the content you have won t fit on a single page, Silverlight will clip it to the dimensions specified in PrintableArea. In those cases, you may want to handle manually clipping and saving the remaining elements for the next page. To indicate additional pages, use the HasMorePages property.

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In a typical OLTP system consisting of lots of short, simple transactions, multiple CPUs are valuable in their ability to service lots of simultaneous threads from multiple users. In contrast, a typical OLAP (reporting/data warehouse) application consists of a smaller number of much larger queries. It follows that splitting up a query into multiple chunks, with each chunk running on a separate CPU, is more suited to an OLAP system whereby large amounts of resources can be used to speed up the execution time of large queries. During query compilation, SQL Server will decide whether to use a parallel query if the MAXDOP setting allows and if the estimated cost of executing the query in a serial manner on a single CPU exceeds a cost threshold. By default, MAXDOP is 0, meaning that SQL Server is left to decide the appropriate number of CPUs to use. You can set this value to 1, effectively disabling parallel queries, or to a specific number that limits the number of CPUs that can be used.

function _wallSides(x1:Integer,x2:Integer , r:Integer, opBack:Number,opFore:Number) : Node[] { var half:Integer = x1 + ((x2-x1)/2).intValue(); for(x in [x1..x2]) {

To avoid the hazards mentioned, force Visual Basic to require that you declare all variables before you use them. To do so, place the following line at the top of your code module: Option Explicit Alternatively, you can turn on explicit data type checking by choosing Tools Options and checking the Require Variable Declaration box, as shown in Figure 2-1.

attribute is used, the resulting XAML won t work. The benefit of this validation is that XAML won t ever fall into the black hole of quirks, incompatibilities, and haphazard development of HTML. There are a fair number of other markup languages for designing user interfaces, such as MXML (Adobe Flex), XUL (Mozilla/Firefox), and GladeXML (GNOME/Linux). Given the ubiquity of Windows, it s likely that XAML will quickly become the most widely deployed of these languages.

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