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Connection Pool by Function
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The documentation recommends that you create connection pools for specific functions In particular, it lists out the following scenarios: Data access Authentication
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Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
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Authorization Populating session variables Populating repository variables
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Although many of these topics have not yet been discussed, you should understand that you will want to use separate connection pools for each of these scenarios for two reasons: First, dedicated connection pools for each scenario help to control performance The resources used to log a user onto Oracle BI will be separated from the resources used by users actually querying databases As you will see, many things can happen while a user s session is being established You ll want to take care to make that logon as fast as possible Second, you may want to run different connection pool scripts in different scenarios For example, in 14, we use connection pool scripts to persist the end user s identity to the database Often, this needs to happen only during actual data access
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Multiple Connection Pools
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We just discussed one reason for multiple connection pools: different connection pools based on what that connection pool is doing You might also want to create multiple connection pools for data access This allows you to control the maximum number of connections per pool, and it allows you to perform resource management Suppose, for example, that you wanted to give one group of users more database resources than another group You can create two connection pools and set them up to use different shared logons On the database, it is now easy to isolate each group of users and assign the appropriate resources In Oracle BI, you can control which group of users uses which connection pool by setting permissions on the connection pool For example, group A has permission to use connection pool A, and the database applies a certain resource policy to those connections Group B has permissions to use connection pool B, and the database can apply a different resource policy to these users It is worth summarizing how Oracle BI decides which connection pool to use For everything but data access, you will be able to state explicitly which connection pool you want to use For example, in the upcoming sections, we will use a feature called initialization blocks to set up authentication In the initialization block, you get to specify the exact connection pool you want to use For data access, you do not get to specify the connection pool you use When you define connection pools for a database in the Administration tool, the order is important For data access, the BI server uses the first connection pool that you have permission to use and that has open connections available TIP Make sure your data access connection pools are always listed first in the list of connection pools
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As mentioned, understanding session variables is a crucial part of securing Oracle BI Setting up session variables is in fact a prerequisite step to securing Oracle BI In this section, we will cover all types of Oracle BI variables: server, presentation, and session variables
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Securing Access to Oracle BI
Server and Presentation Variables
Server variables are either static variables or dynamic variables, and they work as their names imply Static variables are set when the BI server starts, and dynamic variables are refreshed on a periodic basis The examples used in this book and the metadata that ships with the Oracle BI (SampleSalesrpd) use a static server variable called BI_EE_HOME This holds the value of where you installed Oracle BI and is used in the connection pool for the Sample Sales database to point to the XML data source (You ll notice in the appendix that you will need to set this variable before the examples can be used) An example of a dynamic server variable is also included in the examples for this book This variable in the example is called CURRENT_YEAR The value of this variable is set to be refreshed every night at midnight (although it will change only once per year) This variable could be used to create a rolling window filter, and it makes it extremely easy for you to create a report that always shows the current year Server variables are managed in the BI server metadata using the Administrator tool Use the Manage Variables screen to create these variables An initialization block is used to define how the variable is populated and the refresh frequency Figure 13-2 shows an example server variable that stores the current year
FIGURE 13-2
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