crystal reports barcode font formula Using the V$ACTIVE_SESSION_HISTORY View in Font

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Using the V$ACTIVE_SESSION_HISTORY View
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The V$ACTIVE_SESSION_HISTORY view provides a window on the ASH data held in memory by the Oracle instance before it s flushed as part of the hourly AWR snapshots. You can use it to get information on things such as the SQL that s consuming the most resources in the database, the particular objects causing the most waits, and the identities of the users who are waiting the most. In the following sections I show how to use the ASH information to gain valuable insights into the nature of the waits in your instance, including answering such questions as the objects with the highest waits, the important wait events in your instance, and the users waiting the most.
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CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
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Objects with the Highest Waits
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The following query identifies the objects causing the most waits and the type of events the objects waited for during the last 15 minutes: SQL> 2 3 4 5 6 7 8 9* SELECT o.object_name, o.object_type, a.event, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, dba_objects o WHERE a.sample_time between sysdate - 30/2880 and sysdate AND a.current_obj# = o.object_id GROUP BY o.object_name, o.object_type, a.event ORDER BY total_wait_time; OBJECT_TYPE ----------TABLE TABLE INDEX TABLE TABLE EVENT ------------------------SQL*Net message to client db file sequential read db file sequential read log file sync db file sequential read TOTAL_WAIT_TIME ---------------2 8836 9587 23633 43612
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OBJECT_NAME -----------UC_ADDRESS PERS_PHONES PAY_FK_I UC_STAGING PERSONNEL SQL>
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Most Important Wait Events
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The following query lists the most important wait events in your database in the last 15 minutes: SQL> 2 3 4 5 6 7 8* SELECT a.event, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a WHERE a.sample_time between sysdate - 30/2880 and sysdate GROUP BY a.event ORDER BY total_wait_time DESC; TOTAL_WAIT_TIME -----------------878774247 300006992 210117722 21588571 1062608 105271 13019 274 35 6
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EVENT -----------------------------wait for SGA component shrink smon timer PL/SQL lock timer SQL*Net message from client db file scattered read db file sequential read log file sync latch free SQL*Net more data to client null event 17 rows selected. SQL>
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Users with the Most Waits
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The following query lists the users with the highest wait times within the last 15 minutes:
CH A PT ER 2 0 PERF O RMAN CE TUNI NG: TUN ING TH E I NS TA NCE
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; TOTAL_WAIT_TIME --------------165104515 21575902 5019123 569723 376354 395
SID USERNAME -----------1696 SYSOWNER 885 SYSOWNER 1087 BLONDI 1318 UCRSL 1334 REBLOOM 1489 FRAME 15 rows selected. SQL>
Identifying SQL with the Highest Waits
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* SELECT a.user_id,d.username,s.sql_text, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, v$sqlarea s, dba_users d WHERE a.sample_time between sysdate - 30/2880 and sysdate AND a.sql_id = s.sql_id AND a.user_id = d.user_id GROUP BY a.user_id,s.sql_text, d.username; SQL_TEXT ---------------------------BEGIN dbms_stats . . .; END; TOTAL_WAIT_TIME ---------------9024233
USER_ID USERNAME ---------- -------0 SYS . . . SQL>
Wait Classes and the Wait-Related Views
The V$SESSION_WAIT view shows the events and resources that active sessions are waiting for. Using the V$SESSION_WAIT view, you can also see what types of wait classes your session waits belong to. Here s an example: SQL> SELECT wait_class, event, sid, state, wait_time, seconds_in_wait FROM v$session_wait ORDER BY wait_class, event, sid;
CHAPTER 20 PERFOR MAN CE TUNING: TUNING THE INSTA NCE
WAIT_CLASS EVENT SID ---------- -------------------- ---------Application enq: TX 269 row lock contention Idle Queue Monitor Wait 270 Idle SQL*Net message from client 265 Idle jobq slave wait 259 Idle pmon timer 280 Idle rdbms ipc message 267 Idle wakeup time manager 268 Network SQL*Net message to client 272 SQL>
STATE WAIT_TIM ------- -------WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITED SHORT TIME
SEC_IN_WAIT ----------73 40 73 8485 73 184770 40 1
The previous query indicates that the most important wait lies within the Application wait class. The V$SYSTEM_WAIT_CLASS view gives you a breakdown of waits by wait classes, as shown here: SQL> SELECT wait_class, time_waited FROM v$system_wait_class ORDER BY time_waited DESC; WAIT_CLASS -------------------Idle User I/O Other Concurrency Network Application Commit Configuration System I/O Administrative Scheduler 11 rows selected. SQL> TIME_WAITED -----------1.0770E+11 4728148400 548221433 167154949 56271499 46336445 35742104 11667683 8045920 760 16
The V$SESSION_WAIT_CLASS view shows the total time spent in each type of wait class by an individual session. Here s an example: SQL> 2 3 4* SELECT wait_class, time_waited FROM v$session_wait_class WHERE sid = 1053 ORDER BY time_waited DESC; TIME_WAITED ----------21190 8487 70 13 0 0
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