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It should be noted that if the outage is to persist for an extended period of time, and you have some outstanding transactions, you can commit/roll them back manually yourself. You might want to do this since an in-doubt distributed transaction can cause writers to block readers this is the one time this can happen in Oracle. Your DBA could call the DBA of the other database and ask her to query the status of those in-doubt transactions. Your DBA can then commit or roll them back, relieving RECO of this task.

s Note ASP.NET Web Forms validation controls at least allow for basic data validation in the UI, with that validation automatically extended to the browser by the Web Forms technology itself. Though not a total solution, this is a powerful feature that does help.

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The checkpoint process doesn t, as its name implies, do a checkpoint (checkpoints were discussed in 3, in the section on redo logs) that s mostly the job of DBWn. It simply assists with the checkpointing process by updating the file headers of the data files. It used to be that CKPT was an optional process, but starting with version 8.0 of the database, it is always started, so if you do a ps on UNIX, you ll always see it there. The job of updating data files headers with checkpoint information used to belong to the LGWR; however, as the number of files increased along with the size of a database over time, this additional task for LGWR became too much of a burden. If LGWR had to update dozens, or hundreds, or even thousands of files, there would be a good chance sessions waiting to commit these transactions would have to wait far too long. CKPT removes this responsibility from LGWR.

It is also important that you are able to differentiate between a host service and a hosted service. Each service device can have zero or one host services and zero or more hosted services. A host service can be thought of as the main service of the device and is directly associated with a device. It plays an important role in the discovery process and might be the most general service to provide basic controlling. You could further add more specific services as hosted services. If your device only provides one service, you can set it as the host service. Hosted services are mostly functional. In addition to your custom hosted services, the DPWS standard defines a set of built-in services to manage discovery, metadata exchange, and eventing. Later, when probing for devices that provide a particular service, whether a service is the host or is hosted doesn t matter. The only difference is that a probe match will only contain details about the host service; you will not see the hosted services. We ll discuss matches in the next section.

Almost all applications employ some data access. Obviously, the CSLA .NET framework puts heavy emphasis on enabling data access through the data portal, as described in 4. Beyond the basic requirement to create, read, update, and delete data, however, there are other needs. During the process of reading data from a database, many application developers find themselves writing repetitive code to eliminate null database values. SafeDataReader is a wrapper around any ADO.NET data reader object that automatically eliminates any null values that might come from the database. When creating many web applications using either Web Forms or Web Services, data must be copied into and out of business objects. In the case of Web Forms data binding, data comes from the page in a dictionary of name/value pairs, which must be copied into the business object s properties. With Web Services, the data sent or received over the network often travels through simple data transfer objects (DTOs). The properties of those DTOs must be copied into or out of a business object within the web service. The DataMapper class contains methods to simplify these tasks.

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