NUMERIC AND BOOLEAN TYPES in C#.net

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CHAPTER 4 s DATA ACCESS AND SECURITY
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As long as an object in the .NET Framework is somehow referenced, it is not disposed of by the garbage collector. An object can be referenced not only by variables but also by delegates. type1.MyEvent += type2.MyEventRaised; Even if no variable refers to the type2 object in the preceding example, because of the registered callback method, the type2 object is still referenced by type1. The type2 object can be disposed of only after type1 is. If you want to be able to dispose of type2 as soon as no variable points to it, without having to remove the event handler manually with the minus operator (-=), use the WeakDelegate class. This class is only available in the .NET Micro Framework and, therefore, in the Microsoft. SPOT namespace. No changes are visible on the interface for the users of a class with weak delegates. You only need to change the implementation of the event in the Type1 class. In order to use a weak delegate instead of a strong delegate, Type1 must look as it does in Listing 9-5.
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The stored parameter file for that database currently has: sys%ORA11GR2> create pfile="/tmp/pfile" from spfile; File created. sys%ORA11GR2> !cat /tmp/pfile; ora11gr2.__db_cache_size=88080384 ora11gr2.__java_pool_size=4194304 ora11gr2.__large_pool_size=4194304 ora11gr2.__pga_aggregate_target=524288000 ora11gr2.__sga_target=268435456 ora11gr2.__shared_io_pool_size=0 ora11gr2.__shared_pool_size=146800640 ora11gr2.__streams_pool_size=0 *.compatible="11.2.0.0.0" *.control_files="/home/ora11gr2/app/ora11gr2/oradata/orcl/control01.ctl","/home/ora11gr2/ app/ora11gr2/flash_recovery_area/orcl/control02.ctl" *.db_16k_cache_size=16777216 *.db_block_size=8192 *.db_name="orcl" *.db_recovery_file_dest="/home/ora11gr2/app/ora11gr2/flash_recovery_area" *.db_recovery_file_dest_size=4039114752 *.diagnostic_dest="/home/ora11gr2/app/ora11gr2" *.log_buffer=1 *.memory_target=792723456 *.open_cursors=300 *.pga_aggregate_target=256m *.processes=600 *.remote_login_passwordfile="EXCLUSIVE" *.resource_limit=TRUE *.sga_target=268435456 *.undo_tablespace="UNDOTBS1" As you can see, the double-underscore parameters in bold now include the __sga_target and __pga_aggregate_target settings as well as the various pools. These values are derived based on the last three memory parameters shown in bold, as well as the observed server workload. In this fashion, Oracle will remember your last optimal SGA/PGA settings and use them upon the next restart.
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Datatypes. You can see we are partitioning by a TIMESTAMP and we are adding an INTERVAL of one month to it. In the Datatypes chapter, we saw how adding an INTERVAL of one month to a TIMESTAMP that fell on January 31st would raise an error, since there is no February 31st. Would the same thing be possible with interval partitioning The answer is in short no. If you attempt to use a date such as 29-01-1990 (any day of the month after 28 would suffice), you will receive an error ORA-14767: Cannot specify this interval with existing high bounds . The database will not permit you to use a boundary value that is not safe to add the interval to.
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The results against the index here were identical, which makes sense, as the data stored in the index is just the same regardless of how the table is organized. The logical I/O went from 1,374 for a single execution of this query to 245, just as before. But overall the amount of logical I/O performed by this query did not differ significantly: 21,357 versus 20,281. The reason The amount of logical I/O performed against the table did not differ at all if you subtract the logical I/O against the index from the total logical I/O performed by each query, you ll find that both queries did 19,983 logical I/Os against the table. This is because every time we wanted N rows from the database the odds that any two of those rows would be on the same block was very small there was no opportunity to get multiple rows from a table block in a single call. Every professional programming language I have seen that can interact with Oracle implements this concept of array fetching. In PL/SQL you may use BULK COLLECT or rely on the implicit array fetch of 100 that is performed for implicit cursor for loops. In Java/JDBC, there is a prefetch method on a connect or statement object. Oracle Call Interface (OCI; a C API) allows you to programmatically set the prefetch size, as does Pro*C. As you can see, this can have a material and measurable effect on the amount of logical I/O performed by your query, and it deserves your attention.
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CHAPTER 13 EM ULATOR COMPON ENTS
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All effect files were listed completely earlier in the recipe. The same holds for the main methods related to deferred shading. Since you ve split up your code into methods, your Draw method stays pretty clean: protected override void Draw(GameTime gameTime) { //render color, normal and depth into 3 render targets RenderSceneTo3RenderTargets(); //Add lighting contribution of each light onto shadingMap shadingMap = GenerateShadingMap(); //Combine base color map and shading map CombineColorAndShading(); base.Draw(gameTime); }
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protected ViewState is in scope and is inherited for free from the base class. From a cross-page postback, however, you need to expose this ViewState value explicitly. Here s another property you ll add to the CrossPage code: public string SomeValue { get { if (ViewState["SomeValue"] == null) return "SomeValue not set. "; else return ViewState["SomeValue"].ToString(); } } This allows CrossPage2 to obtain a strongly typed reference to this value, again with better encapsulation, as CrossPage2 doesn t need to be concerned with where this value comes from. If the ViewState entries are dynamic, and, therefore, cannot be known in advance, the entire state bag could be explicitly exposed to the consuming page. public object GetViewStateValue(string ViewStateEntryName) { return ViewState[ViewStateEntryName]; } Let s continue with the example, which demonstrates pulling information from the posting page using each of these techniques. You ve seen the markup and most of the code for the posting page, which is named CrossPage.aspx. You ll add this code, which populates the SomeValue property you ve exposed by pulling in a value from the query string: //This is the page load of CrossPage, not CrossPage2 void Page_Load(object sender, EventArgs e) { if (!this.IsCrossPagePostBack && Request.QueryString["SomeValue"] != null) this.ViewState["SomeValue"] = Request.QueryString["SomeValue"].ToString(); } This code brings up some very interesting things to note about the lifetime of a Page object used in a cross-page postback. The first thing that this code checks is a new Boolean property of the page named IsCrossPagePostBack. This value is false when CrossPage is first created and true when CrossPage2 is first created after CrossPage posts to it. Using this Boolean on the page being posted to (like CrossPage2) is very straightforward. You can design a page to accept cross-page postbacks, but have a default rendering behavior if it s requested with a fresh get. The property can be used to calibrate which way to render. On a cross-page postback, realize also that IsCrossPagePostback is true, while IsPostBack is false, so you can also design a page to accept a cross-page postback, as well as process postbacks of its own. The page originating the post warrants a closer examination (CrossPage in this example). You can also design this page to postback to itself, and then, after completing a process, or some other precipitating event, do a post to a different page (a game could do a cross-page postback when the game is over to the high-score board and pass along the score, for example).
Figure 6-62. The MediaElement with a Source video.
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The following is the accompanying C# code-behind that will execute the MouseEnter state when a Button named MyBtn is moused-over: void MyBtn_MouseEnter(object sender, MouseEventArgs e) { VisualStateManager.GoToState(this, "MouseEnter", true); } Seems pretty straightforward, right Next I explain and show you Blend s States panel.
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