Simple .NET/ASP.NET PDF document editor web control SDK

As shown, the total soft parse count is 10,001: 10,000 in the ref cursor case and 1 in the static cursor case (that occurs the first time in the static cursor case loop). Thus, we can conclude that the PL/SQL cursor cache significantly increases our performance transparently for static cursors (and native dynamic SQL cursors in 10g). This is another point in favor of using the combination of PL/SQL packaged procedures/functions and CallableStatement in JDBC programs (apart from the reasons discussed in 6).

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If you open the _main method, you ll find the following code that we have annotated with the corresponding F# statements: .method public static void _main() cil managed { .entrypoint // Code size 56 (0x38) .maxstack 4 // let i = 2;; IL_0000: ldc.i4.2 IL_0001: stsfld

Note Prior to Oracle 9.2.0.5, the maximum number of the cursors in the PL/SQL cache was bounded by

Page == this) is necessarily true in a type that inherits from the Page object This is the instance of the Control that has this Control in its control collection For a Page object, this value is null, as the Page is the root of the tree For a Form object living on a Page, this value will point to the Page So for a Form, it s true that (thisPage == thisParent) However, for a Control living on the Form, the Parent is the Form object Every control can have its visibility set to false This is a nice feature, because while the control will squirrel away its state in the ViewState hidden input, it won t render any HTML to represent itself at all.

int32 '<StartupCode>'.Hw::i@3

the value of the init.ora parameter open_cursors. The PL/SQL engine would start hard-closing the cursors once this limit was reached, so that you couldn t run out of cursors on account of the PL/SQL caching mechanism. However, starting with 9.2.0.5, this upper bound is defined by the session_cached_cursors parameter. When session_cached_cursors is either not set or set to 0, Oracle uses a PL/SQL cache of size 50. When session_cached_cursors is set to any nonzero value, the PL/SQL cursor cache size is bound by the session_cached_cursors size. This is critical to understand, since a low PL/SQL cache size can have a negative impact on your application s performance.

// do Console.WriteLine("Input a number:");; IL_0006: ldstr "Input a number:" IL_000b: call void [mscorlib]System.Console::WriteLine(string) IL_0010: ldnull // let v = Int32.Parse(Console.ReadLine());; IL_0011: stsfld class [fslib]Microsoft.FSharp.Core.Unit '<StartupCode>'.Hw::_doval@6@6 IL_0016: call string [mscorlib]System.Console::ReadLine() IL_001b: call int32 [mscorlib]System.Int32::Parse(string) IL_0020: stsfld int32 '<StartupCode>'.Hw::v@8 // do Console.WriteLine(i * v);; IL_0025: ldc.i4.2 IL_0026: call int32 Hw::get_v() IL_002b: mul IL_002c: call void [mscorlib]System.Console::WriteLine(int32)

This is very different than using Cascading Style Sheets (CSS) or script to make an element hidden once it gets to the client This makes it possible to code a Wizardstyle interface using Panel controls, where only one Panel is visible at a time All of the children of the panel will store their state in the ViewState, but their markup will be generated only when the Panel is visible, keeping the response stream as short as possible Of course, this also means you can set the visibility of the Page itself to false, but we ve yet to find any usefulness in a page you can t see This will return true if there are any controls in the ControlCollection of the Control you ve called the method on It s useful for quickly checking if a Control has any children of its own.

As mentioned in the beginning of this chapter, statement caching was introduced in JDBC 3.0. Put simply, statement caching improves performance by caching cursors associated with statements executed repeatedly in a loop. As you ll see soon, the performance improvement comes because statement caching prevents the overhead of repeated creation of cursors and repeated soft parses that a statement goes through when it is prepared using PreparedStatement or CallableStatement in a loop.