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OBJECT_NAME OBJECT_TYPE EVENT TOTAL_WAIT_TIME ------------------- -------------------------------------------------UC_ADDRESS TABLE SQL*Net message to client 2 PERS_PHONES TABLE db file sequential read 8836 PAY_FK_I INDEX db file sequential read 9587 UC_STAGING TABLE log file sync 23633 PERSONNEL TABLE db file sequential read 43612 SQL>

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The following query lists the most important wait events in your database in the last 15 minutes: SQL> 2 3 4 5 6 7 8* SELECT a.event, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a WHERE a.sample_time between sysdate - 30/2880 and sysdate GROUP BY a.event ORDER BY total_wait_time DESC;

EVENT TOTAL_WAIT_TIME --------------------------------------------------------wait for SGA component shrink 878774247 smon timer 300006992 PL/SQL lock timer 210117722 SQL*Net message from client 21588571 db file scattered read 1062608 db file sequential read 105271 log file sync 13019 latch free 274 SQL*Net more data to client 35 null event 6 17 rows selected. SQL>

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public class Receiver { AutoResetEvent semaphore; public Receiver(AutoResetEvent theSemaphore) { semaphore = theSemaphore; } public void WaitForEvents() { while (true) { semaphore.WaitOne(); // this call blocks until semaphore is signaled // notification received... } } } The sender and receiver are assumed to run in different threads of the same process. The Sender and Receiver objects are given a reference to the shared semaphore. When Sender wishes to fire an event, it signals the semaphore by calling the Set method. The Receiver object calls the semaphore s WaitOne method to block and wait for incoming notifications. A problem with the example shown is that AutoResetEvent is a binary semaphore, so it only supports two states. If the semaphore is set before sender fires the event, it means there is a pending notification that the receiver hasn t read yet. The sender would need to wait until the receiver cleared the semaphore before firing a new event; otherwise, the receiver would miss the first notification. What you need is a regular semaphore that manages an internal counter that stores the number of pending notifications. The diagram in Figure 8-19 shows how the semaphore would be used.

Had I been able to complete the test (I have 2GB of real memory on this server and my SGA was 600MB; by the time I got to 325 users, the machine was paging and swapping to the point where it was impossible to continue), at 500 users I would have allocated around 2,750MB of RAM! So, the DBA would probably not set the SORT_AREA_SIZE to 5MB on this system, but rather to about 0.5MB, in an attempt to keep the maximum PGA usage at a bearable level at peak. Now at 500 users I would have had about 500MB of PGA allocated, perhaps similar to what we observed with automatic memory management but at times when there were fewer users, we would have still written to temp rather than performing the sort in memory. In fact, when running the preceding test with a SORT_AREA_SIZE of .5MB, we would observe the data in Table 4-3.

The following query lists the users with the highest wait times within the last 15 minutes: SQL> 2 3 4 5 6 7 8 9* SELECT s.sid, s.username, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, v$session s WHERE a.sample_time between sysdate - 30/2880 and sysdate AND a.session_id=s.sid GROUP BY s.sid, s.username ORDER BY total_wait_time DESC;

SID USERNAME TOTAL_WAIT_TIME ---------- ------------------------------ ----------------1696 SYSOWNER 165104515 885 SYSOWNER 21575902 1087 BLONDI 5019123 1318 UCRSL 569723 1334 REBLOOM 376354 1489 FRAME 395 15 rows selected. SQL>

Table 4-3. PGA Memory Allocation Behavior with Increasing Numbers of Active Sessions, with SORT_AREA_SIZE Set to 0.5MB (Manual Memory Management)

Figure 8-19. Using a regular semaphore to deliver notifications The difference between this diagram and the one using a binary semaphore is the semaphore method called when an event is fired. With a regular semaphore, you call the Signal operation to increment the semaphore s internal counter. Now the sender doesn t have to wait for the receiver to read notifications, and can fire events at will. Listing 8-21 and Listing 8-22 show an Object Pascal implementation.

Using the following query, you can identify the SQL that s waiting the most in your instance. The sample time covers the last 15 minutes.

SQL> 2 3 4 5 6 7 8 9*

1 26 51 76 101 126 151 176 201 226

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