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Also, if we are using connection pooling with Oracle Net, then our session might not be associated with any process at all; the client would drop the connection after an idle time and reestablish it transparently upon detecting activity In short, there is a many-to-many relationship between connections and sessions However, the most common case, the one most of us see day to day, is a one-to-one relationship between a dedicated server and a single session..

Before we continue to examine the rest of the processes, let s discuss why there are two connection modes and when one might be more appropriate than the other.

Public Sub New(ByVal list As IList(Of T)) mList = list If TypeOf mList Is IBindingList Then mSupportsBinding = True mBindingList = DirectCast(mList, IBindingList) AddHandler mBindingList.ListChanged, AddressOf SourceChanged End If End Sub Not only is the source object reference stored, but if it implements IBindingList, then it is cast to that type, and a second reference is maintained. In that case, its ListChanged event is handled as well. I ll discuss handling of the ListChanged event later. First, it is important to understand some of the key plumbing code used in SortedBindingList.

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As noted previously, in dedicated server mode there is a one-to-one mapping between client connection and server process. This is by far the most common method of connection to the Oracle database for all SQL-based applications. It is the simplest to set up and provides the easiest way to establish connections. It requires little to no configuration. Since there is a one-to-one mapping, you do not have to be concerned that a long-running transaction will block other transactions. Those other transactions will simply proceed via their own dedicated processes. Therefore, it is the only mode you should consider using in a non-OLTP environment where you may have long-running transactions. Dedicated server is the recommended configuration for Oracle, and it scales rather nicely. As long as your server has sufficient hardware (CPU and RAM) to service the number of dedicated server processes your system needs, dedicated server may be used for thousands of concurrent connections. Certain operations must be done in a dedicated server mode, such as database startup and shutdown, so every database will have either both or just a dedicated server setup.

The TinyCLR layer consists of the following three components: Hardware abstraction layer (HAL): The HAL is tightly coupled to the hardware and provides functions to access the hardware and peripherals. When running on an operating system, the HAL provides functionality by using the services of the underlying OS. Platform abstraction layer (PAL): The PAL provides additional abstractions of the HAL, such as timers and memory blocks. .NET Micro Framework CLR: The CLR consists of the execution engine that manages code at execution time. The managed type system ensures strict type safety. The CLR also contains the garbage collector, which is responsible for automatically freeing unused memory blocks, and the internal native methods called by the base class library. In addition, there is a boot loader that loads and starts the TinyCLR.

Implementing a read-only sorted view of a collection is relatively straightforward, but implementing a view that is bidirectionally updatable is quite complex. And that s exactly what SortedBindingList does.

Shared server setup and configuration, while not difficult, involves an extra step beyond dedicated server setup The main difference between the two is not, however, in their setup; it is in their mode of operation With dedicated server, there is a one-to-one mapping between client connections and server processes With shared server, there is a many-to-one relationship: many clients to a shared server As its name implies, shared server is a shared resource, whereas a dedicated server is not When using a shared resource, you must be careful to not monopolize it for long periods of time As you saw previously, use of a simple DBMS_LOCKSLEEP(20) in one session would monopolize a shared server process for 20 seconds Monopolization of these shared server resources can lead to a system that appears to hang Figure 5-2 depicts two shared servers.

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