ASP.NET Web PDF Document Viewer/Editor Control Library

The Database Resource Manager lets you use plan directives, which can specify limits on resource usage. Plan directives include the following parameters, which you can use to shift the priority of consumer groups: SWITCH_TIME SWITCH_GROUP SWITCH_ESTIMATE A user will be assigned to a certain consumer group at the beginning of a transaction. If the user s transaction is active for more than the number of seconds specified by the switch_time parameter, the transaction is automatically switched to a lower priority group specified by the switch_group parameter. You can have the Database Resource Manager determine whether it should switch a user session even before an operation starts by setting the switch_estimate parameter to true. In this case, the Database Resource Manager will estimate the time it will take for the operation to complete, and based on that time estimate, the Database Resource Manager will determine whether it should switch the user s consumer group right away.

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Different tools can be used to inspect a .NET assembly and its contents. The two most common ones are ILDASM and Reflector. ILDASM is deployed with the .NET Framework SDK. Reflector is a tool written by Lutz Roeder.2 Both tools have UIs that show the contents on an assembly in a tree structure. For the ILDASM output for the following code, take a look at Figure 4-1. // SampleLib.cpp // build with: "CL /LD /clr:safe SampleLib.cpp" namespace MyNamespace { public ref class SampleClass { bool SampleField1; int SampleField2; public: SampleClass() : SampleField1(true), SampleField2(1234) {} void SampleMethod() {} void StaticSampleMethod() {} }; } // MyNamespace ILDASM and Reflector both have outstanding features that are worth mentioning here. Using ILDASM s command-line parameter /out:<outfile>, it is possible to produce a text file describing all managed aspects of your assembly. If your .NET assembly contains only managed aspects, you can use a tool called ILASM to produce an assembly out of such source code again. This approach to disassemble, modify, and recompile is sometimes used to make minor changes to assemblies generated by tools. Reflector is able to reverse-engineer managed code into different .NET languages. Reflector is a pluggable application; you can plug in support for further languages and other metadatabased tools. In addition, it is often more convenient to use than ILDASM. For example, when managed code is displayed in Reflector, the meaning of various elements of the managed code can be displayed in tool tips. Furthermore, you can use hyperlinks in managed code to easily switch to types or functions used in the code.

If you then log into some other system that has your home directory mounted, you ll have access to the .Xauthority and DISPLAY information that you need in order to set both correctly on that system and allow X-based clients running there to attach to your X server. The action creates two files based on your current X-server settings: .xauth.$LOGNAME and .xdisp.$LOGNAME. It also changes the permissions on the files so that they are accessible only by the files owner. The security issue mentioned earlier in regard to protecting the .Xauthority file holds true, because your files exist on an NFS server and its administrators have access to your files. The last command calls up a script that opens the X Navigation Window application that I mentioned previously. You can read about it in 22.

When you create resource consumer groups using the Database Resource Manager, you can set the active session pool for each group. An active session is one where a transaction or a select operation is currently active. Once the consumer group s active session pool limit is reached, new sessions belonging to the group can t become active. They re queued by the Database Resource Manager and allowed to become active as the current active sessions complete. You can set an optional time-out period for the queued sessions in each group. If a session is queued past this time-out period, it will abort with an error message. The user then has the choice of resubmitting the job or ignoring it.

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