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The V$SYSTEM_EVENT view shows the total time waited for all the events for the entire system since the instance started up The view doesn t focus on the individual sessions experiencing waits, and therefore it gives you a high-level view of waits in the system You can use this view to find out what the top instance-wide wait events are You can calculate the top n waits in the system by dividing the event s wait time by the total wait time for all events The three key columns of the V$SYSTEM_EVENT view are total_waits, which gives the total number of waits; time_waited, which is the total wait time per session since the instance started; and average_wait, which is the average wait time by all sessions per event The V$SESSION_EVENT view is similar to the V$SYSTEM_EVENT view, and it shows the total time waited per session.

All the wait events for an individual session are recorded in this view for the duration of that session By querying this view, you can find out the specific bottlenecks encountered by each session The third dynamic view is the V$SESSION_WAIT view, which shows the current waits or justcompleted waits for sessions The information on waits in this view changes continuously based on the types of waits that are occurring in the system The real-time information in this view provides you with tremendous insight into what s holding up things in the database right now The V$SESSION_WAIT view provides detailed information on the wait event, including details such as file number, latch numbers, and block number This detailed level of information provided by the V$SESSION_WAIT view enables you to probe into the exact bottleneck that s slowing down the database.

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The low-level information helps you zoom in on the root cause of performance problems The following columns from the V$SESSION_WAIT view are important for troubleshooting performance issues: EVENT: These are the different wait events described in the next section (for example, latch free and buffer busy waits) P1, P2, P3: These are the additional parameters that represent different items, depending on the particular wait event For example, if the wait event is db file sequential read, P1 stands for the file number, P2 stands for the block number, and P3 stands for the number of blocks If the wait is due to a latch free event, P1 stands for the latch address, P2 stands for the latch number, and P3 stands for the number of attempts for the event WAIT_CLASS_ID: Identifies the wait class WAIT_CLASS#: Number of the wait class WAIT_CLASS: Name of the wait class.

WAIT_TIME: This is the wait time in seconds if the state is waited known time SECONDS_IN_WAIT: This is the wait time in seconds if the state is waiting STATE: The state could be waited short time, waited known time, or waiting, if the session is waiting for an event The fourth wait-related view is the V$SESSION view Not only does this view provide many details about the session, it also provides significant wait information as well The V$SESSION view contains all the columns of the V$SESSION_WAIT view, plus a number of other important session-related columns Because of this overlap of wait information in the V$SESSION and the V$SESSION_WAIT views, you can use the V$SESSION view directly to look for most of the waitrelated information, without recourse to the V$SESSION_WAIT view.

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Figure 8-17. Using pipes to send data between processes The diagram shows the receiver blocking on the pipe read. Pipes also support a nonblocking peek method, so readers can check for incoming data periodically. Most pipe implementations

You can start analyzing the wait events in your system by first querying the V$SYSTEM_EVENT view to see if any significant wait events are occurring in the database You can do this by running the query shown in Listing 22-15..

Listing 22-15. Using the V$SYSTEM_EVENT View to View Wait Events SQL> 2 3 4* SELECT event, time_waited, average_wait FROM V$SYSTEM_EVENT GROUP BY event, time_waited, average_wait ORDER BY time_waited DESC;

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