ASP.NET Web PDF Document Viewer/Editor Control Library

Notice that the argument passed to the StreamReader constructor is the expression %fs. In this expression, % is used as a prefix operator. This operator has been introduced in C++/CLI to obtain a tracking handle encapsulated by an implicitly dereferenced variable. This operator is similar to the & prefix operator (the address-of operator) for native types.

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If none of the previous steps indicated any problems, chances are that your system is suffering from a serious contention for some resource such as library cache latches. Check to see if there s contention for critical database resources such as locks and latches. For example, parsing similar SQL statements leads to an excessive use of CPU resources and affects instance performance by increasing the contention for the library cache or the shared pool. Contention for resources manifests itself in the form of wait events. The wait event analysis earlier in this chapter gave you a detailed explanation of various critical wait events. You can use AWR and ASH reports to examine the top wait events in your database. The V$SESS_TIME_MODEL (and the V$SYS_TIME_MODEL) view is useful in finding out accumulated time for various database operations at the individual session level. This view helps you understand precisely where most of the CPU time is being spent. As explained in 17, the V$SESS_TIME_MODEL view shows the following things, among others: DB time, which is the elapsed time spent in performing database user level calls. DB CPU is the amount of CPU time spent on database user-level calls. Background CPU time is the amount of CPU time used by the background processes. Hard parse elapsed time is the time spent hard parsing SQL statements. PL/SQL execution elapsed time is the amount of time spent running the PL/SQL interpreter. Connection management call elapsed time is the amount of time spent making session connect and disconnect calls. You can use segment data in the V$SEGMENT_STATISTICS view to find out the hot table and index segments causing a particular type of wait, and focus on eliminating (or reducing, anyway) that wait event.

n autonomous mail processor, procmail allows you to process your e-mail based on rules This is much like setting up rules in your e-mail client for the handling of messages based on, for example, the sender s e-mail address or on specified strings in the subject line One of procmail s advantages, compared to traditional e-mail clients, is that the rules can be defined in such a way that when specific criteria are met, a script is called to perform a task Whatever you can do in a shell script, you can do with procmail Once you have mastered the art of writing procmail scripts, it is a very powerful skill to have in your arsenal I have used procmail for quite a few tasks One processed customer feedback surveys and generated reports for use in managing a technical support group.

Let s say you encounter a situation where one of your key nightly batch jobs is running past its time window and continuing on into the daytime, where it s going to hurt the online OLTP performance. You know the batch job used to finish within the stipulated time, but now it s tending to take a much longer time. In Oracle Database 10g Release 2, you can use the Database Control s Compare