Simple .NET/ASP.NET PDF document editor web control SDK

The value of 0 under the WAIT_TIME column indicates that the wait event db file sequential read is occurring for this session. When the wait event is over, you ll see values for the WAIT_TIME and the SECONDS_IN_WAIT columns. You can also use the V$SQLAREA view to find out which SQL statements are responsible for high disk reads. If latch waits predominate, you should be looking at the V$LATCH view to gain more information about the type of latch that s responsible for the high latch wait time: SQL> 2 3 4* SID ---1218 1400 SQL> SELECT sid, blocking_session, username, event, seconds_in_wait siw FROM V$SESSION WHERE blocking_session_status = 'VALID'; BLOCKING_SESS ------------1527 1400 USERNAME -------UCR_USER APPOWNER EVENT ----------------------------enq: TX - row lock contention latch free SIW ----23 0

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The V$SESSION_WAIT_HISTORY view holds information about the last ten wait events for each active session. The other wait-related views, such as the V$SESSION and the V$SESSION_WAIT, show you only the wait information for the most recent wait. This may be a short wait, thus escaping your scrutiny. Here s a sample query using the V$SESSION_WAIT_HISTORY view: SQL> 2 3 4* SELECT seq#, event, wait_time, p1, p2, p3 FROM V$SESSION_WAIT_HISTORY WHERE sid = 988 ORDER BY seq#; WAIT_TIME P1 --------- ----0 0 0 1.3835E+19 0 4 1 2 2 0 0 P2 P3 ----- ------___ 52 21944 50 19262 198 0 205 21605 52 13924 49 29222 52 14591 52 12723 205 11883 205 21604

ET s CLI introduces a new type system called the Common Type System (CTS). A major design goal of the CTS is language interoperability. This means that the CTS is used by all .NET languages hence the name Common Type System. Language interoperability is helpful for users of class libraries as well as for developers writing class libraries for others. Due to the CTS s language interoperability, many .NET class libraries can be used by all .NET languages. Even if you switch from one .NET language to another, your knowledge about the .NET class libraries and their types is likely not lost. This is especially helpful because the Microsoft .NET Framework SDK ships with a huge, powerful base class library. Throughout this book, I will call this base class library the Framework Class Library (FCL). Class library developers benefit from the CTS because all potential client languages use the CTS, too. Without such a language-interoperable type system, it would be necessary to use only a very limited set of interoperable types in signatures of methods visible to library users. As an example, C++ developers writing COM components callable by Visual Basic cannot use character pointers or the type std::string for string arguments. Parameters of type BSTR, a special COM-specific language-interoperable string type, are required instead. For a developer of a .NET class library, the situation is different. Not all .NET languages support all possible types that can be defined with the CTS, but the number of types known by all .NET languages is significantly greater. Figure 2-1 shows a schema of the CTS that is not complete, but sufficient for the current discussion.

SEQ# EVENT -------------------------1 db file sequential read 2 db file sequential read 3 latch: shared pool 4 db file sequential read 5 db file sequential read 6 db file sequential read 7 db file sequential read 8 db file sequential read 9 db file sequential read 10 db file sequential read 10 rows selected. SQL>

You should now be able to start using ed effectively. Take note again that the ed input can contain multiple entries to perform several tasks on a single file. Often the desired search strings or their replacements become known just before the target file is manipulated. For example, your ed command input may depend on accessing variables that were set prior to creating the ed script. For more examples of this technique in action, take a look at the scripts in s 36 and 37.

Note that a zero value under the WAIT_TIME column means that the session is waiting for a specific wait event. A nonzero value represents the time waited for the last event.

The V$SESSION_WAIT view tells you what resource a session is waiting for. The V$SESSION view also provides significant wait information for active sessions. However, neither of these views provides you with historical information about the waits in your instance. Once the wait is over, you can no longer view the wait information using the V$SESSION_WAIT view. The waits are so fleeting