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The advantage of a bad memory is that one enjoys several times the same good things for the first time Friedrich Nietzsche Any software of any reasonable complexity is best designed if organized in layers Each layer represents a logical section of the system A layer is hosted on a physical tier (for example, a server machine) Multiple layers can be hosted on the same tier, and each layer can optionally be moved to a separate tier at any time and possibly with limited work Most of the time, you arrange a three-tiered architecture with some flavors of service orientation just to make each layer ready for a possible move to a different physical tier.

The SELECT statement returns a single row and single column of text of XML that contains the XML plan for the query. It is too large to print in the book, but it starts with

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There are various reasons to move a layer onto its own tier: a quest for increased scalability, the need for stricter security measure, and also increased reliability because the layers become decoupled in case of machine failure In a three-tiered scenario, you typically have a presentation layer where you first take care of processing any user input and then arranging responses, a business logic layer (BLL) that includes all the functional algorithms and calculations that make the system work and interact with other layers, and the data access layer (DAL) where you find all the logic required to read and write from a storage When it comes to layers, the principle of separation of concerns (SoC) that I introduced in 13, Principles of Software Design, is more important than ever A golden rule of any layered system states that no communication should be allowed between non-interfacing layers.

CREATE DATABASE MyFilestreamDB ON PRIMARY ( NAME = Rowdata1, FILENAME = 'c:\Data2\Rowdata1.mdf'), FILEGROUP FileStreamGroup1 CONTAINS FILESTREAM DEFAULT( NAME = FSData1, FILENAME = 'c:\Data2\filestream1'), FILEGROUP FileStreamGroup2 CONTAINS FILESTREAM ( NAME = FSData2, FILENAME = 'c:\Data2\filestream2') LOG ON ( NAME = FSDBLOG, FILENAME = 'c:\Data2\FSDB_log.ldf');

In other words, you should never directly access the DAL from within the presentation layer In terms of Web Forms development, this point is blissfully ignored when you use a SqlDataSource component right from the button click event handler of a Web page! In this chapter, I ll describe the intended role and content of business and data access layers and touch on a few technologies that help you write them I ll do that from a Web Forms and ASPNET perspective, but be aware that a large part of the content has a general validity that goes beyond the Web world I ll cover presentation layers and related patterns in the next chapter..

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If the current user isn t granted access to the requested page or resource, ASP.NET sends an error page to the client browser, mentioning HTTP error code 401.2.

linked dimension A dimension based on a dimension that is stored in a separate Analysis Services database which may or may not be on the same server.

SQL Server Event Alert SQL Server Event Alerts are based on the SQL Server error messages that are generated by SQL Server 2005 Database Engine. The error messages are stored in the sys.sysmessages system catalog. You need to be familiar with the various error messages that can be generated by SQL Server, their severity, and message text so you can define alerts for them. Database developers can add their own user-defined messages in using the sp_addmessage system stored procedure and generate them using the RAISERROR T-SQL statement. SQL Server Performance Condition Alert

Points to consider when reporting trends include: Trends typically do not add value until there are at least three measurements. Sometimes trends cannot be effectively detected until there are more than three measurements. Start creating your trend charts with the first set of data, but be cautious about including them in formal reports until you have collected enough data for there to be an actual trend to report. Share trends with the technical team before including them in formal reports. This is another generally good practice, but it is particularly relevant to trends because developers, architects, administrators, and DBAs often will have already backed out a change that caused the trend to move in the wrong direction before they are able to compile their report. In this case, you can decide that the trend report is not worth including, or you can simply make an annotation describing the cause and stating that the issue has already been resolved.

When a cached page has several vary-by headers or parameters, a separate version of the page is available for each HTTP header type or parameter name.

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