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While this is a bit more complex than dealing with a conventional collection, you can think of named slots as being like a collection of arbitrary values associated with a Thread object When running in ASPNET, things are a bit simpler, because HttpContext has an Items collection This is a dictionary of name/value pairs that is automatically maintained by ASPNET and is available to your code Within ASPNET, this is the only safe place to put shared data like context data, because ASPNET may switch your code to run on different threads in certain advanced scenarios..

PL/SQL code is not only cached here, it is shared here as well If you have 1,000 sessions all executing the same code, only one copy of the code is loaded and shared among all sessions Oracle stores the system parameters in the Shared pool The data dictionary cache (cached information about database objects) is stored here In short, everything but the kitchen sink is stored in the Shared pool The Shared pool is characterized by lots of small (4KB or less in general) chunks of memory Bear in mind that 4KB is not a hard limit there will be allocations that exceed that size but in general the goal is to use small chunks of memory to prevent the fragmentation that would occur if memory chunks were allocated in radically different sizes, from very small to very large.

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The ApplicationContext class stores the client and global context data in named slots on the current thread or in the Items collection of HttpContext. It abstracts all the complexity, simply exposing the context data as a pair of collection objects via Public properties that can be used by other framework code, business code, or UI code. For instance, here s the ClientContext property: Public ReadOnly Property ClientContext() As HybridDictionary Get Dim ctx As HybridDictionary = GetClientContext() If ctx Is Nothing Then ctx = New HybridDictionary SetClientContext(ctx) End If Return ctx End Get End Property The client context data is a standard .NET HybridDictionary object: a collection of name/value .NET. pairs much like Session in ASP

The memory in the Shared pool is managed on a LRU basis It is similar to the buffer cache in that respect if you don t use it, you ll lose it A supplied package called DBMS_SHARED_POOL may be used to change this behavior to forcibly pin objects in the Shared pool You can use this procedure to load up your frequently used procedures and packages at database startup time, and make it so they are not subject to aging out Normally, though, if over time a piece of memory in the Shared pool is not reused, it will become subject to aging out Even PL/SQL code, which can be rather large, is managed in a paging mechanism so that when you execute code in a very large package, only the code that is needed is loaded into the Shared pool in small chunks.

If you don t use it for an extended period of time, it will be aged out if the Shared pool fills up and space is needed for other objects The easiest way to break Oracle s Shared pool is to not use bind variables As you saw in 1, not using bind variables can bring a system to its knees for two reasons: The system spends an exorbitant amount of CPU time parsing queries The system uses large amounts of resources managing the objects in the Shared pool as a result of never reusing queries If every query submitted to Oracle is a unique query with the values hard-coded, the concept of the Shared pool is substantially defeated The Shared pool was designed so that query plans would be used over and over again If every query is a brand-new, never-before-seen query, then caching only adds overhead.

Some .NET Micro Framework modules have on-board pulse-width modulators. But currently, PWM can be used on only these few modules through special integration by device vendors. In addition, using PWM requires native and managed drivers on your platform. Devices that support PWM through proprietary libraries include the Meridian CPU from Device Solutions, Embedded Master Module from GHI Electronics, and Embedded Development Kit (EDK) from SJJ Embedded Micro Solutions. These devices are described in greater detail in 2.

HybridDictionary is used because it self-optimizes, keeping its data in an array format if there are few elements, and switching to a hashtable if there are many elements in the collection. This provides an automatic trade-off between memory consumption and fast lookup of items based on the name value.

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