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Some binaries are shared between the installations, such as the client tools Installing instances is covered in detail in 3 When installing SQL Server instances onto a machine, there is the concept of a default instance and a named instance A server can have only one default instance but multiple named instances Default and named instances are identical with regard to the artifacts that get installed, such as binaries, registry keys, and so forth The only thing that makes a default instance special is that it can be addressed from a client using only the server name, whereas a named instance must be addressed with the server and instance name For example, if your server is called SVR-PROD-01, you can connect to the default SQL Server instance by specifying only SVR-PROD-01 in your client tools, whereas to connect to a named instance called DEV on the same server, you would address the server with SVR-PROD-01\DEV Client connectivity is covered in more detail later in this chapter
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Default instances are by far the most popular type of installation on stand-alone servers, and in the majority of cases, the default server port of 1433 is also used This means that to connect to a SQL Server, you only need to specify the machine name (and the relevant credentials) As you move to more consolidated environments where multiple instances are running on the same machine and in clusters, named instances are essential since you can only have one default instance Even with multiple instances, you can configure multiple IP addresses on a server and configure each instance to listen on port 1433 on its own IP address The resources that an instance can consume on a server can be managed by setting limits for the individual instance or they can be set to allow access to all available resources Each running instance can be left to share and contend for the same available resources, such as CPU and memory Setting boundaries for CPUs is done through setting an affinity mask, which instructs SQL Server as to which of the available CPUs in the server it can use Memory settings are controlled by setting a minimum and maximum memory limit that the instance can use Unlike Oracle, where automatic memory-management features have been introduced only within the past few releases, the SQL Server platform has always used automatic management of memory and, as such, has only a small number of configurable parameters that can be set to control memory allocation Allocation of memory to the various caches is dynamically controlled by SQL Server based on demand The most notable of the available settings are the Min Server Memory and Max Server Memory parameters A default out-of-the-box installation sets the SQL Server Min and Max Server Memory settings to allow SQL Server as much memory as it requires without creating problems for the OS it is running on This is achieved by SQL Server receiving notifications from the Windows OS when it is starting to experience memory-pressure issues When a notification is received, SQL Server reviews its memory allocation and releases memory back to the OS when it can do so
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Internally, SQL Server is broken down into four main components: the protocol layer, the relational engine, the storage engine, and SQLOS Figure 2-14 shows the four layers and the components found at each layer The diagram is by no means an exhaustive list of all the components but it does highlight the major elements found at each layer
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At the top of the stack, the protocol layer is responsible for receiving the client requests over the various protocols such as TCP/IP; it also unpacks the request (or T-SQL language event, as it is known) and passes it to the relational engine for processing (Client connectivity is covered later in this chapter)
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