#!/bin/sh usage="$0 {target file containing any special characters to be escaped}" if [ $# -eq 0 ] then echo $usage exit 1 fi if [ ! -f $1 ] then echo File $1 does not exist echo $usage exit 1 else file=$1 fi

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;

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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>

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*

To understand the difference in the way virtual functions are dispatched on an object while it is constructed, it is necessary to understand the details of virtual function calls on C++ classes and managed classes. Since the CTS does not support multiple inheritance, I will ignore complex multiple inheritance scenarios in the discussion of native virtual functions here. Virtual functions of native classes are dispatched via the famous vtable (virtual function table). A vtable is an array of pointers to virtual functions that a class introduces, inherits, or overrides. In the following code, the class Derived inherits two virtual functions (f1 and f2); one of them is overridden (f2). Furthermore, it introduces the virtual function f3: class Base { public: // Base does not inherit virtual functions

If these requirements aren t met, the script displays the usage information and exits. The following code starts the here-document for input to the ed command:

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

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; 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 SEC_IN_WAIT ----------------------- -WAITING 0 73 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITED SHORT TIME 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 TIME_WAITED ----------------------------------------------Idle 1.0770E+11 User I/O 4728148400 Other 548221433 Concurrency 167154949 Network 56271499 Application 46336445 Commit 35742104

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