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11. Click Finish, and complete the onscreen directions to finish importing the data into the current Excel workbook; start Microsoft Query and perform more advanced data filtering operations before importing the data into the current Excel workbook; or in Excel 2003 create an offline cube file from the imported data.

Sharing a Pivot Cache When you create a pivot table, a pivot cache is created, which stores a copy of the source data. If you add another pivot table to the workbook and base it on an existing pivot table in the same workbook, it uses the pivot cache from the first pivot table, which saves memory and reduces the file size. If they use the same Excel list as their source data, you can change existing pivot tables so they share the same pivot cache.

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Connection pooling is implemented by the Managed Providers of data access The discussion in the section pertains to the SQL- and Oracle-managed providers from Microsoft The ODBCand OLEDB-managed providers are backwards compatibility layers, and so rely on the native pooling functionality provided by the driver or provider, respectively Connections are established on a per-user basis That is, two different users cannot share a connection to the database This is true whether you re using integrated security or a database-specific security model This works fine when a web application is executing as a dedicated user (such as ASPNET, the user the ASP NET Framework runs as by default) When you re using impersonation and integrated security, though, code is executed with the credentials of the user that has requested the page This leaves connection pools virtually useless, which can seriously impair the scalability of your application.

You may find it helpful to rename the source pivot tables before you begin, so they re easier to identify Tip

In this exercise, you will practice using Microsoft Query to filter data in a text file as you are importing it into the current Excel workbook. You will also practice changing the data in the text file and refreshing the changed data in the Excel workbook. Use Microsoft Query to filter data in the text file as you are importing it: 1. Start Excel. 2. With a new blank worksheet visible, in Excel 2007, click Data Get External Data From Other Sources From Microsoft Query. In Excel 2003, click Data Import External Data New Database Query. 3. In the Choose Data Source dialog box, with the Databases tab selected, click <New Data Source>, and click OK. 4. In the What Name Do You Want to Give Your Data Source, type Alaska Fish Counts Text File. 5. In the Select a Driver for the Type of Database You Want to Access list, select Microsoft Text Driver (*.txt; *.csv).

For this reason, impersonation in the data access tier is not highly recommended Instead, you should use a dedicated user account or a database user defined for the application Pooling behavior is controlled using attributes in the connection string You can control the minimum pool size, control the maximum pool size, or opt out of pooling altogether When designing your application to leverage connection pools, the most important thing to keep in mind is that there is a pool allocated for each connection string and for each security context For example, when you re using impersonation within ASP .

1. Right-click a cell in a pivot table for which you want to change the data source. 2. Choose PivotTable Wizard. 3. Click the Back button twice to return to Step 1. 4. Under the heading Where is the data that you want to analyze , select Another PivotTable report or PivotChart report. 5. Click Next, and in Step 2, select the pivot table that you want to use as the source. 6. Click Finish.

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