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For the special case of select * from table, the optimizer seems to use the avg_row_len from user_tables as the row size if the statistics have been generated by dbms_stats, but sum(avg_col_len) if the statistics have been generated by analyze. (The optimizer can identify how the statistics were generated by checking the global_stats column of user_tables or user_tab_columns.)

Note All the parameter, field, and variable references used inside a measure expression point to the

If we check the column names and column lengths from the view user_tab_columns, we get the results shown in Table 12-1.

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Figure 6-8. The ASP .NET page lifecyle revisited We re now interested in these two stages: Load the viewstate (between the Init and Load stages) Save the viewstate (between the PreRender and Render stages) The content of the hidden field is parsed and placed again in the control s properties, immediately after the Init event, through a method called LoadViewState(). The new, posted values are then processed and loaded, and assigned as the values of their corresponding controls. The Control Events stage in the middle is the moment when your event handlers are called. Now you can understand how a TextBox can know that its Text property has changed and raise the corresponding event, for example. From viewstate, ASP .NET loads the value originally sent to the client, and when processing the posted data, the control can detect that the new

avg_col_len (dbms_stats)

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value is different from the original value This mechanism, which is also available to custom control developers, makes it almost unnecessary to use the RequestForm collection anymore As you can see, the viewstate doesn t hold resources on the server side It s a client-side state feature, as it s kept in a field in the HTML page itself It s not for free, however; state serialization must be done, as well as optionally hashing and encrypting it for increased security (discussed in 10) An interesting case where you can see all these concepts applied is when a value selected in a combo box is changed When the page is initially submitted to the browser, the viewstate contains the items in the list, with the first one selected (for example) If the user changes the selected element, on postback, LoadViewState will load the complete list of items.

references declared in the crosstab dataset definition. If the crosstab does not use a subdataset run, then all these references point to the report s main dataset. Therefore, they are actually parameters, fields, and variables of the parent report.

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Next, LoadPostData will contain the newly selected item Based on this information, the new item in the server control will be marked as selected, and ASP NET will also know it needs to raise the SelectedIndexChanged event at the appropriate time (after the Load event) This is how the whole event-based structure works Inside your handlers, you can set controls values as usual, and immediately after the PreRender event, the SaveViewState() method will be called to take care of persisting them to the viewstate for later use When the page is posted back again, those values will be automatically loaded by ASP NET Now you can understand the importance of the moment you use to perform processing If you change values in the Render phase (overriding the Render virtual method), the changes won t be persisted to the viewstate, and thus will be lost on postback.

Total for Table (dbms_stats)

The PreRender stage, on the other hand, or for that matter, any event handler you attach to a control, are good places to make changes that should be persisted in the viewstate Because the viewstate is saved to a hidden input field in the rendered HTML, it increases not only the page size, but also the posted form at runtime It also adds processing on the server, because the server needs to deal with it and perform the steps for handling the viewstate Thus, you should enable the viewstate only when it s really needed It can be configured at four levels: Web server control: All these controls have an EnableViewState property to enable/ disable this feature User controls: These controls also have an enableViewState property.

avg_col_len (analyze)

Crosstab measures behave just like report variables. They store a value that is incremented with each iteration through the crosstab dataset. The supported types of calculations are the same for measure as for report variables, except for the calculation type System, which does not make sense for measures. Furthermore, custom-defined calculations can be introduced using implementations of the net.sf.jasperreports.engine.fill.JRExtendedIncrementer interface, as explained in the discussion of the incrementerFactoryClass attribute in the Incrementers section of 8.

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