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Datasets can be typed or untyped. The datasets you ve used so far have all been untyped. They were instances of System.Data.DataSet. An untyped dataset has no built-in schema. The schema is only implicit. It grows as you add tables and columns to the dataset, but these objects are exposed as collections rather than as XML schema elements. However, as we mentioned in passing in the previous section, you can explicitly export a schema for an untyped dataset with WriteXmlSchema (or WriteXml). A typed dataset is one that s derived from System.Data.DataSet and uses an XML Schema (typically in an .xsd file) in declaring the dataset class. Information from the schema (tables, columns, and so on) is extracted, generated as Visual Basic code, and compiled, so the new dataset class is an actual .NET type with appropriate objects and properties.

Did you know that it s not hard to mount an ISO file that you created with dd The only thing that Tip you need to know is that you have to use the -o loop option, which allows you to mount a file like any normal device. So, to mount /mycd.iso on the /mnt directory, you would need sudo mount -o loop /mycd.iso /mnt.

You should use transactions when several operations must succeed or fail as a unit. The following are some frequent scenarios where you must use transactions: In batch processing, where multiple rows must be inserted or deleted as a single unit Whenever a change to one table requires that other tables be kept consistent When modifying data in two or more databases concurrently In distributed transactions, where data is manipulated in databases on different servers

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When you use transactions, you place locks on data pending permanent change to the database. No other operations can take place on locked data until you lift the lock. You could lock anything from a single row up to the whole database. This is called concurrency; that is, concurrency is how the database handles multiple updates at one time. In the bank example, locks ensure that two separate transactions don t access the same accounts at the same time. If they did, either deposits or withdrawals could be lost.

Either typed or untyped datasets are equally valid, but typed datasets are more efficient and can make code somewhat simpler For example, using an untyped dataset, you d need to write this: ConsoleWriteLine(dsTables(0)Rows(0)("CompanyName")) to get the value for the CompanyName column of the Customers table, assuming that the data table was the first in the dataset With a typed dataset, you can access its data tables and data columns as class members You could replace the previous code with this: ConsoleWriteLine(dsCustomers(0)CompanyName) making the code more intuitive In addition, the Visual Studio code editor has IntelliSense support for typed datasets Typed datasets are more efficient than untyped datasets because typed datasets have a defined schema, and when they re populated with data, runtime type identification and conversion aren t necessary, since this has been taken care of at compile time.

Making a backup of a CD-ROM with dd is one option. And any other similar device can be copied as well. How would you go about making a complete copy of your entire hard disk It s easy, but I recommend that you first boot your server using the rescue option that you can find on the installation CD. Doing this gives you a complete Linux system that doesn t use any of the files on your server s hard disk, which ensures that no files are in use at that moment. Before you start, make sure you know what device is used by your server s hard drive. The best way to find out is by using the sudo fdisk -l command, which provides a list of all partitions found on your server, with the local hard disk coming first. In most cases, the name of your hard drive will be /dev/sda, but it may be /dev/hda or something completely different. Let s assume that your server s hard drive is /dev/sda, and you now have to attach a second hard drive to your server. Typically, this second drive would be known as /dev/sdb. Next, you can use the dd command to clone everything from /dev/sda to /dev/sdb: dd if=/dev/sda of=/dev/sdb. This command takes quite some time to complete, and it also wipes everything that currently exists on /dev/sdb, replacing it with the contents of /dev/sda. Unfortunately, it often takes several hours to dd everything from one hard disk to another.

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