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11. Produce a matrix report (one column per department, one row for each job) where each cell shows the number of employees for a specific department and a specific job. In a single SQL statement, it is impossible to dynamically derive the number of columns needed, so you may assume you have three departments only: 10, 20, and 30. Solution 8-11. SQL> 2 3 4 5 6 7 8 9 10 11 12 13 14 select , job count(case when deptno <> 10 then null else deptno end ) as dept_10 , sum(case deptno when 20 then 1 else 0 end ) as dept_20 , sum(decode(deptno,30,1,0)) as dept_30 from employees group by job;
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The newest version of Microsoft Network Monitor is an immensely powerful and useful network management and troubleshooting tool. It lets you see all network traffic entering and exiting your computer. It is an indispensable part of any administrator s toolbox. Network monitor is available at na=22&p=2&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=&u=%2fdownloads%2fdetails.aspx%3fFamilyID%3d18b1d59d-f4d8-4213-8d172f6dde7d7aac%26DisplayLang%3den.
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The implementation of the stored procedure sp_pivot suffers from bad programming practices and security flaws . As I mentioned earlier in the chapter, Microsoft strongly advises against using the sp_ prefix for user-defined procedure names . On one hand, creating this procedure as a special procedure allows flexibility; on the other hand, by doing so you re relying on behavior that is not supported . It is advisable to forgo the flexibility obtained by creating the procedure with the sp_ prefix and create it as a regular user-defined stored procedure in the user databases where you need it . The code defines most input parameters with a virtually unlimited size (using the MAX specifier) and doesn t have any input validation . Because the stored procedure invokes dynamic execution based on user input strings, it s very important to limit the sizes of the inputs and to check those for potential SQL injection attacks . With the existing implementation it s very easy for hackers to inject code that will do damage in your system . As an example for injecting malicious code through user inputs, consider the following invocation of the stored procedure:
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<Application xmlns="" xmlns:x="" x:Class="SlidingBlocks3.App"> <Application.Resources> </Application.Resources> </Application>
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You can use the following questions to test your knowledge of the information in Lesson 2, Troubleshooting Websites. The questions are also available on the companion CD as a practice test, if you prefer to review them in electronic form.
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In Windows Vista, Plug and Play support is optimized for USB, IEEE 1394 (FireWire), PCMCIA (PC Card), PCI, and PCI Express (PCIe) devices. By definition, any USB or PCMCIA device is a Plug and Play device, as are virtually all PCI and PCIe devices. Devices that connect to a parallel or serial port may or may not be fully Plug and Play compatible. Legacy devices that use the ISA bus are by definition not capable of being managed by Plug and Play; for the most part, ISA devices are found only in computers manufac-
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So if you define your own attribute classes, you must also implement some code that checks for the existence of an instance of your attribute class (on some target) and then execute some alternate code path . This is what makes custom attributes so useful! The FCL offers many ways to check for the existence of an attribute . If you re checking for the existence of an attribute via a System.Type object, you can use the IsDefined method as shown earlier . However, sometimes you want to check for an attribute on a target other than a type, such as an assembly, a module, or a method . For this discussion, let s concentrate on the methods defined by the System.Attribute class . You ll recall that all CLS-compliant attributes are derived from System.Attribute . This class defines three static methods for retrieving the attributes associated with a target: IsDefined, GetCustomAttributes, and GetCustomAttribute . Each of these functions has several overloaded versions . For example, each method has a version that works on type members (classes, structs, enums, interfaces, delegates, constructors, methods, properties, fields, events, and return types), parameters, modules, and assemblies . There are also versions that allow you to tell the system to walk up the derivation hierarchy to include inherited attributes in the results . Table 18-1 briefly describes what each method does .
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The first step in the tuning methodology is to identify, at the instance level, which types of waits contribute most to the waits in the system. In SQL Server 2005, you do this by querying a dynamic management view (DMV) called sys.dm_os_wait_stats; in SQL Server 2000, you do this by running the command DBCC SQLPERF(WAITSTATS). The aforementioned DMV in SQL Server 2005 is fully documented, and I urge you to read the section describing it in Books Online. I'm not sure why, but the command in SQL Server 2000 is undocumented and surfaced only several years after the product was released. However, from the documentation in SQL Server 2005 you can learn about the different types of waits that are relevant to SQL Server 2000 as well. The sys.dm_os_wait_stats DMV contains 194 wait types, while the command in SQL Server 2000 will return 77. If you think about it, these are small manageable numbers that are convenient to work with as a starting point. Some other performance tools give you too much information to start with, and create a situation in which you can't see the forest for the trees. I'll continue the discussion assuming you're working with SQL Server 2005. Run the following query to return the waits in your system sorted by type: SELECT wait_type, waiting_tasks_count, wait_time_ms, max_wait_time_ms, signal_wait_time_ms FROM sys.dm_os_wait_stats
public override void Run() { var updatingSurveyResultsSummaryJob = this.container.Resolve <UpdatingSurveyResultsSummaryCommand>(); var surveyAnswerStoredQueue = this.container.Resolve <IAzureQueue<SurveyAnswerStoredMessage>>(); BatchProcessingQueueHandler .For(surveyAnswerStoredQueue) .Every(TimeSpan.FromSeconds(10)) .Do(updatingSurveyResultsSummaryJob); var transferQueue = this.container .Resolve<IAzureQueue<SurveyTransferMessage>>(); var transferCommand = this .container.Resolve<TransferSurveysToSqlAzureCommand>(); QueueHandler .For(transferQueue) .Every(TimeSpan.FromSeconds(5)) .Do(transferCommand); while (true) { Thread.Sleep(TimeSpan.FromSeconds(5)); } }
If you have ever used Microsoft XML Core Services (MSXML) the Microsoft COM XML parser you have certainly noticed that it allows you to initialize the parser from a well-formed XML string. However, the long list of constructors that the XmlTextReader class boasts gives no clear indication that that same MSXML feature is also supplied by the .NET Framework. In this section, you'll learn how to parse XML data stored in a memory string. First I'll show you how to work with plain strings with no context information, and then I'll show you how to process XML fragments using specific context information for the parser, such as namespaces and document type declarations. Parsing Well-Formed XML Strings The trick to initializing a text reader from a string is all in packing the string into a StringReader object. One of the XmlTextReader constructors looks like this: public XmlTextReader(TextReader); TextReader is an abstract class that represents a .NET reader object capable of reading a sequence of characters no matter where they are physically stored. The StringReader class inherits from TextReader and simply makes itself capable of reading the bytes of an in-memory string. Because StringReader derives from TextReader, you can safely use it to initialize XmlTextReader. string xmlText = " "; StringReader strReader = new StringReader(xmlText); XmlTextReader reader = new XmlTextReader(strReader); The net effect of this code snippet is that the XML code stored in the xmlText variable is parsed as it is read from a disk file or an open stream or downloaded from a URL. Important Any class based on TextReader is inherently not thread-safe. Among other things, this means that the string object you are using to contain parsable XML data might be concurrently accessed from other threads. Of course, this happens only under special conditions, but it is definitely a plausible scenario. If you have a multi-threaded application and the string itself happens to be globally visible throughout the application, one thread could break the well-formedness of the string while another thread is parsing it. To avoid this situation, create a thread-safe wrapper for the StringReader class using the TextReader class's static member Synchronized, as shown here: String xmlText = " "; StringReader sr = new StringReader(xmlText); XmlTextReader reader = new XmlTextReader(sr); TextReader strReader = TextReader.Synchronized(sr); For performance reasons, you should use the thread-safe wrapper class only when strictly necessary. Even better, wherever possible, you should design your code to avoid the need for thread-safe classes.
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