.net pdf library extract text

.net pdf library extract text

.net pdf library extract text

.net pdf library extract text

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When you add fields to the Report Filters area, Excel tries to keep the main section of the pivot table in its current position. Existing Report Filters are pushed up to prevent the main section from moving down. There isn t a setting you can change to prevent this, but one of the following workarounds may help: Instead of arranging the Report Filters vertically, change them to a horizontal layout, as described in the following section. If you have headings on the worksheet, above the pivot table, leave a few blank rows between them and the pivot table. If necessary, insert blank rows before adding fields to the Report Filters area. If the heading information is only required for printing, move the heading text to the Header, where it won t be affected by changes to the pivot table layout. To insert a Header, on the Ribbon, click the Insert tab, and then click Header & Footer in the Text group.

Performance is all about making conscious trade-offs between various resources such as development time, hardware and software resources, customer requirements, etc. You should design in a way that the most important business needs of a user are given the highest priority in terms of meeting performance expectations. An excellent book that discusses this theme in great detail is Cary Millsap s Optimizing Oracle Performance (O Reilly, ISBN: 0-596-00527-X).

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Figure 3-40. The sequence of depth-first delivery with multicast notifications C receives the notification n2 before n1.2, because A blocks after sending n1.1. While A is blocked, B sends the notification n2 to C, making n1.2 and n2 reach C in noncausal order. Even though depth-first delivery doesn t preserve causal order, it is used widely because it is easy to implement and reliable: The delivery order is fixed and guaranteed. The order is not a function of the delivery latency time. The only implementation requirement to support depth-first delivery is this: When sending a notification, the sender must block until the receiver has finished handling the notification.

Design in a way that the most important business needs of a user are given the highest priority in Tip

Breadth-first delivery is used primarily in concurrent systems. You can deliver notifications using either procedure calls or shared resources, but the delivery must be asynchronous. The event source must not block when sending a notification. Breadth-first delivery may provide causal ordering of notifications in some cases. As an example, consider again the system in Figure 3-40. Assume that A multicasts n1.1 to B and then n1.2 to C in rapid succession. The idea here is that n1.1 and n1.2 are separated by a negligible amount of time. If this is true, n1.2 reaches C before B has a chance to handle n1.1 and send n2 to C. The notifications have the timing shown in Figure 3-41.

You have added several fields to the Report Filters area, and they re pushing the pivot table down on the worksheet. You d like to arrange the report filters horizontally, but when you select a report filter cell on the worksheet, and drag it to the right, you get a lengthy message that says you cannot move a part of a PivotTable report. This problem is based on the Horizontal.xlsx sample workbook.

Many developers start the tuning process toward the end of the development cycle or worse still, after deployment! This approach is a recipe for disaster, especially if you have overlooked the scalability aspect of performance in your design. The following are some reasons why you should consider performance from day one. Performance is part of your end user s requirements; it is an important feature that the user demands (implicitly or explicitly). For an end user, bad performance implies that you have not delivered the desired functionality or that your code is buggy. Fixing something in the performance area as an afterthought can lead to expensive code rewrites, customer dissatisfaction and, many times, a failed project. Considering performance early in the process gives you a better idea of various trade-offs and choices that you can present to the user, who can then make informed decisions.

Figure 3-41. Breadth-first delivery timing In order for A to be able to send n1.1 and n1.2 in a breadth-first manner, A must not block when sending n1.1. Right after sending n1.1, A sends n1.2. The underpinning assumption in breadth-first delivery is that t11 < t12, as shown in Figure 3-41. In some situations, due to uncontrollable delivery latencies, it might be possible to have t11 > t12. If this happens, n2 reaches C before n1.2, resulting in noncausal order.

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