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If you want a quick instance-wide wait event status, showing which events were the biggest contributors to total wait time, you can use the query shown in Listing 22-16 (several idle events are listed in the output, but I don t show them here). Listing 22-16. Instance-Wide Waits Sorted by Total Wait Time SQL> 2 3 4 5 6* SELECT event, total_waits,time_waited FROM V$SYSTEM_EVENT WHERE event NOT IN ('pmon timer','smon timer','rdbms ipc reply','parallel deque wait ,'virtual circuit','%SQL*Net%','client message','NULL ORDER BY time_waited DESC;

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This chapter has introduced some of the salient features of C++/CLI. Using C++/CLI, you can combine the good old world of native C++ and the fancy new world of .NET. As you ve seen, you can integrate managed code into existing C++ code and also link native and managed inputs into a single output file. Furthermore, you can seamlessly call between managed and unmanaged code. These features are extremely useful, both for extending existing applications and libraries with .NET features and for writing new .NET applications and libraries that require a lot of interoperability between managed and unmanaged code.

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EVENT TOTAL_WAITS TIME_WAITED -----------------------------------------------------------------db file sequential read 35051309 15965640 latch free 1373973 1913357 db file scattered read 2958367 1840810 enqueue 2837 370871 buffer busy waits 444743 252664 log file parallel write 146221 123435 SQL> The preceding query shows that waits due to the db file scattered read wait event account for most of the waits in this instance The db file sequential read wait event, as you ll learn shortly, is caused by full table scans It s somewhat confusing in the beginning when you re trying to use all the wait-related V$ views, which all look similar Here s a quick summary of how you go about using the key wait-related Oracle Database 10g dynamic performance views First, look at the V$SYSTEM_EVENT view and rank the top wait events by the total amount of time waited, as well as the average wait time for that event.

Start investigating the top waits in terms of the percentage of total wait time You can also look at any AWR reports you may have, because the AWR also lists the top five wait events in the instance Next, find out more details about the specific wait event that s at the top of the list For example, if the top event is buffer busy waits, look in the V$WAITSTAT view to see which type of buffer block (data block, undo block, and so on) is causing the buffer busy waits (a simple SELECT * from V$WAITSTAT gets you all the necessary information) For example, if the undo-block buffer waits make up most of your buffer busy waits, then the undo segments are at fault, not the data blocks Finally, use the V$SESSION view to find out the exact objects that may be the source of a problem.

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For example, if you have a high amount of db file scattered read-type waits, the V$SESSION view will give you the file number and block number involved in the wait events In the following example, the V$SESSION view is used to find out who is doing the full table scans showing up as the most important wait events right now As explained earlier, the db file scattered read wait event is caused by full table scans SQL> SELECT sid, sql_address, sql_hash_value FROM V$SESSION WHERE event = db file scattered read ; Here s an example that shows how to find out the current wait event for a given session: SQL> SELECT sid, state, event, wait_time, seconds_in_wait 2 FROM v$session 3* WHERE sid=1418; SID --1418 STATE -----WAITING EVENT ----------------------db file sequential read WAIT_TIME --------0 SECONDS_IN_WAIT --------------0.