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During garbage collection, the running program may be suspended since the collector may need to manipulate objects needed by its execution In particular, a garbage collector may adopt a strategy named copy collection that can move objects in memory, and during this process, the references may be inconsistent To avoid dangling references, the memory model adopted by the CLR requires that methods access the heap through object references stored on the stack, and objects in the heap are forbidden to reference data on the stack Data structures are the essential tool provided by programming languages to group values A data structure is rendered as a contiguous area of memory in which the constituents are available at a given offset from the beginning of the memory.

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Note It is not very clear from the Oracle 10g Release 1 JDBC documentation that setting the statement

The actual layout of an object is determined by the compiler (or by the interpreter for interpreted languages) and is usually irrelevant to the program since the programming language provides operators to access fields without having to explicitly access the memory System programming, however, often requires explicit manipulation of memory, and programming languages such as C allow controlling the in-memory.

cache size to a nonzero value is required to enable the implicit statement cache (apart from the step of invoking setImplicitCachingEnabled(true)). From the documentation, you might get the impression that setting the cache size is a step required only to enable the explicit statement cache. However, my experiments show that you need to perform both steps to enable the implicit statement cache as well.

properties and events specific to the Control class, which the Page object (and all Web Controls) inherits.

layout of data structures. The C specification, for instance, defines that fields of a structure are laid out sequentially, though the compiler is allowed to insert extra space between them. Padding is used to align fields at word boundaries of the particular architecture in order to optimize the access to the fields of the structure. Thus, the same data structure in a program may lead to different memory layout depending on the strategy of the compiler or the runtime, even in a language such as C where field ordering is well-defined. By default, the CLR lays out structures in memory without any constraint, which gives the freedom of optimizing memory usage on a particular architecture, though it may introduce interoperability issues if a portion of memory must be shared among the runtimes of different languages.1 Interoperability among different programming languages revolves mostly around memory layouts, since the execution of a compiled routine is a jump to a memory address. But routines access memory explicitly, expecting that data is organized in a certain way. In the rest of this chapter, we discuss the mechanisms used by the CLR to interoperate with external code in the form of DLLs or COM components.

To find out the number of statements that you can cache, you can use the method getStatementCacheSize(), as follows: System.out.println("cache size: " + conn.getStatementCacheSize() ); To disable implicit statement caching on a connection object, you need to use the Oracle extension method setImplicitCachingEnabled( boolean flag) as follows: conn.setImplicitCachingEnabled( false ); To disable implicit statement caching on an OracleDataSource object, you need to invoke OracleDataSource.getConnection() with the ImplicitCachingEnabled property set to false, or set ImplicitCachingEnabled on the OracleDataSource by calling OracleDataSource. setImplicitCachingEnabled( false) as follows (assume ods is an initialized variable of type OracleDataSource): ods.setImplicitCachingEnabled( false );

Since all controls expose their own control collection, it follows that any control can contain its own child controls This correlates to what you d expect in HTML, where many of the elements on a page contain child elements Since the Page object also inherits from the Control collection, it acts as the root of this whole coil While there is not a one-to-one correlation between the in-memory structure of the control tree and the hierarchy of the elements in the generated HTML, there is a definite relationship Later, we ll examine the places where the hierarchy of the HTML gets flattened in the control tree and why After the PreRender event fires, the Page enters its rendering behavior.