Event handlers can be defined for a long list of possible events for any Control Flow task or container. Use them for custom logging, error handling, common initialization code, or a variety of other tasks. If a handler is not defined for a given item when an event fires, Integration Services will search parent containers up to the package level looking for a corresponding event handler and use it instead. It is this inheritance that makes event handlers useful, enabling a single handler to be built once and then used repeatedly over many tasks and containers. Once a parent handler has been established, exceptions in the children can be created by setting the child s DisableEventHandler property to true, or by giving the child item its own event handler. To construct an event handler, switch to the Event Handlers tab, and choose the Control Flow item (Executable) in the upper left drop-down list and the event in the upper right list. Then press the hotlink on the design surface to initialize the event. Build the logic within the handler as if it were just another control flow.
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RF Measurements for Cellular Phones and Wireless Data Systems. By A. W. Scott and R. Frobenius Copyright # 2008 John Wiley & Sons, Inc.
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The best values for the readout noise of the onchip electronics is 3 electrons rms at 180 K for the most recent devices; typical values scatter around 5 electrons rms for the XMM system. This includes all noise contributions described in Equation (4.1.4). The charge transfer properties of the pn-CCDs on XMM are reasonably good, in the order of a several percent signal loss from the last to the rst pixel over a distance of 3 cm charge transfer. As the charge transfer losses describe the position dependent energy resolution, it is one of the key parameters for the spectroscopic performance, especially after radiation damage may have occurred. Figure 4.1.46 shows a 55 Fe spectrum of a pnCCD in a at eld measurement resulting in a typical energy resolution of 130 eV at an operating temperature of 120 C.15 The XMM ight camera was operated at 90 C during calibration on the ground with a resolution of about 145 eV (FWHM) over the entire area of 36 cm2 .
to the volume, which adds the requirement that striped areas be the same size. Another similarity between striped and spanned volumes is the lack of fault tolerance, meaning that the failure of any of the striped disks makes the entire volume inaccessible. If you want to add a level of fault tolerance (which is typically recommended), you can use striping with parity (RAID-5). This type of con guration provides redundancy by storing additional parity information as part of the volume. Another type of fault-tolerant volume, a mirror (RAID-1), creates an exact copy of the data, so it does not contribute in any way to increase available space (as a matter of fact, it wastes 50 percent of available space). Fault-tolerant solutions are discussed in the next section. You can enforce disk space quotas on a per-user basis. As shown later in the chapter, you can specify a maximum amount of space that can be used by each user, for each server volume. You can mount a volume onto an empty folder on another volume. This way, from the user s perspective, the available storage is increased by the free space on the mounted volume. This topic is covered in 14. You can redirect shared folders on one server to a shared volume or folder on other servers. This functionality is available with Distributed File System (DFS), presented in 14. You can compress data on volumes. Compression is also covered in 14. You can automatically move older les from a local volume to removable, locally attached media, such as tapes and portable disks. Refer to 14 for details. The preceding options are frequently combined (for example, disk quotas can be applied to a DFS residing on a RAID-5 volume).
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In this example, after the user enters any information into the text area field and submits a response, this information is then displayed on the same page. This is done without returning to the server and regenerating the page.
MySQL controls access based on both a user account and the location from where the user connects to the server. Adding a new user account in MySQL is as simple as using the SQL INSERT statement:
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