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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.

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.

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sort they were all requesting, just did not fit into the 256MB of RAM I had targeted. It simply could not be done. Each session, therefore used as little memory as possible, but had to allocate as much memory as it needed. By the time I finished this test, 500 active sessions were using a total of 467MB of PGA memory as little as they could. You should, however, consider what Table 4-1 would look like under a manual memory management situation. Suppose the SORT_AREA_SIZE had been set to 5MB. The math is very straightforward: each session would be able to perform the sort in RAM (or virtual memory as the machine ran out of real RAM), and thus would consume 6 to 7MB of RAM per session (the amount used without sorting to disk in the previous single-user case). I ran the preceding test again with SORT_AREA_SIZE set to 5MB, and as I went from 1 user to adding 25 at a time, the numbers remained consistent, as shown in Table 4-2. Table 4-2. PGA Memory Allocation Behavior with Increasing Numbers of Active Sessions, with SORT_AREA_SIZE Set to 5MB (Manual Memory Management)

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

You can use semaphores to send notifications between processes or threads running on the same machine. Semaphores are operating system kernel objects that should be used sparingly to send notifications, and only in the following circumstances: When speed is important When shared memory is not an option When pipes are not an option

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

1 26 51 76 102 126 151 176 202 226 251 277 302

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>

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