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The trouble with extended stored procedures is that they work in the address space of SQL Server. Therefore, an extended stored procedure that doesn t behave properly could crash SQL Server. Such a problem is not likely to occur because SQL Server monitors the behavior of extended stored procedures. If an extended stored procedure attempts to reference memory outside of its address space, SQL Server will terminate it. Commonsense programming practices (using error checking, doing exception handling, and thoroughly testing final code) will further reduce the possibility of errors.
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Temporary stored procedures are related to stored procedures as temporary tables are related to tables. You use them when you expect to reuse the execution plan of a stored procedure within a limited time frame. Although you can achieve the same functionality with a standard user-defined stored procedure, temporary stored procedures are a better solution because you do not have to worry about maintenance issues (such as dropping the stored procedure). Temporary stored procedures reside in the tempdb database and must be named with the prefix #. You create them in the same way you create user-defined stored
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SQL Server 2000 Stored Procedure & XML Programming
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procedures. The only change is the use of a # as a name prefix. This prefix signals the server to create the procedure as a temporary stored procedure. This kind of stored procedure can only be used from the session in which it was created. When the session is closed, it will be dropped automatically. This behavior indicates why this type of stored procedure is often also referred to as a private temporary stored procedure. The following code example creates a private temporary stored procedure:
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Create Procedure #prGetId @Make varchar(50), @Model varchar(50) as Select EquipmentId from Equipment where Make = @Make and Model = @Model
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Sometimes, all user-defined stored procedures in tempdb are referred to as temporary stored procedures. This is incorrect because there are major differences between the two. For example, user-defined stored procedures stored in the tempdb database are accessible to all authorized users and are not limited to the session in which they were created. These stored procedures stay in tempdb until the server is shut down, at which time the complete content of tempdb is flushed.
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Global Temporary Stored Procedures
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Global temporary stored procedures are related to temporary stored procedures as global temporary tables are related to private temporary tables. They also reside in the tempdb database, but they use the prefix ##. You create them in the same way you create temporary stored procedures. The only difference is that they are visible and usable from all sessions. In fact, permissions are not required and the owner cannot even deny other users access to them. When the session that has created the procedure is closed, no new sessions will be able to execute the stored procedure. After all instances of the stored procedure already running are finished, the procedure is dropped automatically. The following code example creates a global temporary stored procedure:
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Create Procedure ##prInsertEquipment @Make varchar(50), @Model varchar(50),
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@EqType varchar(50) as declare @EqTypeId smallint select @EqTypeId = EqTypeId from EqType Where EqType = @EqType -- This is OK in a perfect world, -- but it is based on the -- unreasonable assumption that -- you can identify the key using -- the description. Insert Equipment (Make, Model, EqTypeId) Values (@Make, @Model, @EqTypeId)
Remote Stored Procedures
This type is actually a user-defined stored procedure that resides on a remote server. The only challenge implicit in this type of stored procedure is that the local server has to be set to allow the remote use of stored procedures. For more information, search SQL Server Books Online using the following string: How to set up a remote server to allow the use of remote stored procedures.
Microsoft, in fact, considers this mechanism as a legacy of older versions of SQL Server. Heterogeneous queries are the recommended way to execute stored procedures or access tables on other servers.
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