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use of multiple hard disks in an array to provide for larger volume size, fault tolerance, and increased performance. RAID comes in different levels, such as RAID 0, RAID 1, and RAID 5. Higher numbers don t necessarily indicate greater performance or fault tolerance, just different methods of doing the job.

Spanned volume A collection of portions of hard disks combined into a single addressable unit. A spanned volume is formatted like a single drive and can have a drive letter assigned to it, but it will span multiple physical drives. A spanned volume occasionally referred to as an extended volume provides no fault tolerance and increases your exposure to failure but does permit you to make more ef cient use of the available hard disk space.

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The following listing shows the pseudocode of ExecuteXmlReader. What happens under the lid of this method leads straight to the conclusion that the ability to execute a database command to XML can also be added to the OleDbCommand class as well as to the command classes in a number of other managed providers. We'll examine this concept in more detail in a moment. public XmlReader ExecuteXmlReader() { // Execute the command SqlDataReader datareader = ExecuteReader(); // Obtain the TDS stream for the command SqlStream tdsdata = new SqlStream(datareader); // Create the XML text reader 297

With the pipeline in mind, you assume that you can produce a PowerPoint presentation in whatever way you like, as shown on the left in Figure 2-4. After you send this PowerPoint presentation through the pipeline, you assume that its receivers will get it on the other side, as shown on the right. Your work is then done. The only criterion for success is that you delivered the PowerPoint presentation through the pipeline. If for some reason the audience didn t get what you delivered, of course, it s not your fault as a presenter after all, you delivered the PowerPoint presentation, and what they did with it is their problem, not yours. The pipeline assumption is at work when people make statements like, We showed them the facts, but they just didn t get it, or, The presentation went right over their heads. When a verdict in a legal trial goes against one party, it is common for people to say the jury just didn t get the evidence, or when a sales presentation does not succeed, the presenter might say the audience just didn t get the bene ts of the product or service. It is hard to separate the pipeline metaphor from our thinking because it is woven into the words and expressions we use commonly every day.

Striped volume Like a spanned volume, a striped volume combines multiple hard disk portions into a single entity. A striped volume uses special formatting to write to each of the portions equally in a stripe to increase performance. A striped volume provides no fault tolerance and actually increases your exposure to failure, but it is faster than either a spanned volume or a single drive. A stripe set is often referred to as RAID 0, although this is a misnomer, because plain striping includes no redundancy. Mirror volume A pair of dynamic volumes that contain identical data and appear to the world as a single entity. Disk mirroring can use two drives on the same hard disk controller or can use separate controllers, in which case it is sometimes referred to as duplexing. In case of failure on the part of either drive, the other hard disk can be split off so that it continues to provide complete access to the data stored on the drive, providing a high degree of fault tolerance. This technique is called RAID 1. RAID 5 volume Like a striped volume, this combines portions of multiple hard disks

into a single entity with data written across all portions equally. However, it also writes parity information for each stripe onto a different portion, providing the ability to recover in the case of a single drive failure. A RAID 5 volume provides excellent throughput for read operations but is substantially slower than all other available options for write operations.

// (No context information specified) XmlReader xmlreader = new XmlTextReader(tdsdata, XmlNodeTypeElement, null); // Close the temporary data reader but leaves the // stream open datareaderClose(); return xmlreader; } As long as the XML reader is open and in use, the underlying database connection remains open At the end of the day, the trick that makes it possible to access the result set as XML is simply the availability of the data through a stand-alone XML reader object SQL Server 2000 transforms the contents of its low-level TDS stream into XML and then builds an XML text reader from that The whole process takes place on the server Reading from Text Fields Most important with XML readers working on top of SQL commands is that the commands return XML data With SQL Server 2000, this certainly happens if you use any of the FOR XML clauses.

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the RAID strategy. Rather than using several inexpensive hard disks and providing fault tolerance through redundancy, you buy the best hard disk you can and bet your entire network on it. If this doesn t sound like a good idea to you, you re right. It s not.

the failings of any spanning scheme. The failure of any one disk will result in catastrophic data failure.