If you intend to add similar code to the system /etc/profile, you may be interested in also entering the following code to the root user s personal profile to handle the scenario in which an administrator logged into a system as himself and became the root user via the su - command. The code determines which user became root. Then it imports the original user s X-environment settings. Thus, the administrator can run X client applications and have them display with his personal settings. First the code determines which xauth utility to use; it also needs the parent and grandparent process IDs of the running shell (MYPPID and MYPPPID).

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Sample data represents a sample of the total amount of data available. The Automatic Session History (ASH) feature automatically collects session sample data, which represents a sample of the current state of all active sessions. ASH collects the data in memory, where you can view it with the help of V$ views. The AWR helps save the ASH data permanently by collecting it as part of its regular snapshots. I discuss the ASH feature in detail in the Active Session History (ASH) section of this chapter.

A good way to evaluate database performance is by comparing database performance statistics from two periods, where the first period reflects good performance. The statistics from the period when the database performed well are called baseline data. By comparing current performance with the base period s performance, you can check whether the database is doing better or worse.

Metadata isn t only consumed by the runtime and metadata visualizer tools like ILDASM and Reflector; many other tools consume metadata, too For example, Visual Studio s IntelliSense for managed types is only possible because Visual Studio is able to consume metadata of the assemblies referenced by your projects Compilers also need to consume metadata of referenced assemblies to ensure that the types and type members used in the source code actually exist If you want to implement a metadata-driven tool, you need access to metadata, too To consume NET metadata, there are two major reflection APIs One is a native (COMbased) API called the Metadata Unmanaged API The second alternative is the Managed Reflection API, which is part of the FCL In the next sections, I focus on the Managed Reflection API only, since it is almost as powerful as the Metadata Unmanaged API and much easier to use.

Several important Oracle Database 10g performance tools need separate licensing from Oracle Corporation, in addition to the licensing you purchased for the Oracle Database server software. Oracle divides most of its performance functionality into sets of products called Oracle Management Packs, each of which covers several key diagnostic and other management tools. So be aware that while the tools are enabled with the installation of the Oracle Database server software, their production use requires additional licensing. You can purchase the Management Packs only with the Enterprise Edition, and you can access their features through OEM Database Control, Grid Control, and API provided by Oracle. You can purchase licensing for just one or for all of these Management Packs. I summarize the functionality of the Management Packs as follows.

The Oracle Diagnostic Pack allows you to set up automatic processes to monitor performance and system functionality. It contains a number of features: An Automatic Workload Repository (AWR) An Automatic Database Diagnostic Monitor (ADDM)

An event-notification system A history of events and metrics on the database and the host Performance monitoring for the database and the host

XAUTH=`which xauth` MYPPID=`ps -fp $$ | tail -n 1 | awk '{print $3}'` MYPPPID=`ps -fp $MYPPID | tail -n 1 | awk '{print $3}'` MYID=`ps -fp $MYPPID | tail -n 1 | awk '{print $1}'` MYOID=`ps -fp $MYPPPID | tail -n 1 | awk '{print $1}'`

The Oracle Tuning Pack is only available if you have the diagnostic pack and it helps you tune the performance of your database. It includes the following features: The SQL Access Advisor The SQL Tuning Advisor SQL tuning sets Database object reorganization help

The Oracle Configuration Management Pack automates software configuration, software and hardware inventory tracking, patching, and policy management. The Configuration Management Pack facilitates the following: Configuring databases and hosts Managing deployments Staging and viewing of database patches Cloning databases and cloning Oracle home Searching and comparing configuration Managing security and other enterprise policies

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