01.concept owi
TRANSCRIPT
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2007, EXEM Co., LTD. All rights reserved.
Practical OWI Seminar
Concept & OWI
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI CONCEPT
OWI OWI
Wait EventDynamic Performance ViewHistorical Performance Data
AWR (Automatic Workload Repository)ASH (Active Session History)SQL Trace
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
? OWI
?
, , ?
CPU, MEMORY, Response Time, Logical Reads, Physical Reads
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1/32/33/3
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
Process
OWI
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
(Critical Path) OWI
DB Server
Response Time
Network DatabaseWeb
Databasefile App
Network
Web Server
FileServer
Application Server
1/1
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
Process Status & Oracle Wait Events
OWI
WAITINGRUNNINGIDLE
db file scattered readdb file sequential readlatch freeenqueuelog file sync
1/52/53/54/55/5
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI Wait Event Analysis
Oracle 7 Resource Wait Event Wait Time
Shared Pool (library cache latch/pin/lock )Buffer Pool (cache buffers chains latch, cache buffers LRU chain latch )log buffer (log file sync, redo allocation latch, redo copy latch )
Memory I/O , Disk I/O , Latch , Lock
Wait Wait Elapsed Time (Elapsed Time = CPU Time + Wait Time)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI
Wait Event
Dynamic Performance View
HistoricalPerformanceData
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
Wait Event Database Timer , Oracle I/O , Lock, Latch, DB Link, RAC Oracle7.0.12 Oracle Engine Wait Event 1990 Oracle User Group 200011 Oracle magazine(US) Wait Event-based Oracle10g 800~900 Wait Event 10gR1: Enqueue 184, Latch Free 26
OWI - Wait Event
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewEventStat
addr=paddr
=(sid,saddr)
(sql_address,sql_hash_value)=(address,hash_value)
=(address,hash_value)
=(address,hash_value)
=sid =sid
=sid
V$PROCESS(Process ID)SPID
V$SESSION_WAIT(Session Event)
V$SESSION_EVENT(Session Event)
V$OPEN_CURSOR(Session Open Cursor)
V$SQLAREA(SQL Stat)
V$EVENT_NAME(Event p1,p2,p3)
V$SYSTEM_EVENT(Event)V$SYSSTAT(Stat
)V$STATNAME(Stat)
=statistic#
=statistic#
V$SQLTEXT(SQL Full Text)
V$SESSION(Session )
V$SESSTAT( Stat)
V$TRANSACTION(Undo )XIDUSNSTART_TIMEUSED_UBLKUSED_URED
taddr=addr
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
V$EVENT_NAME Instance Wait Event
ViewEvent , Parameter1, Parameter2, Parameter3
V$SYSTEM_EVENT Instance , Session Wait Event (Instance )
Instance , Delta
V$SESSION_EVENT , Session Wait Event
Session , Event
V$SESSION_WAIT Session Wait Event (P1,P2,P3, )
Data , Data, , Query Wait Event
V$SYSTEM_WAIT_CLASS 10g NF.Instance Wait Event Class Grouping
Wait Event , Instance
V$SESSION_WAIT_CLASS 10g NF. Session Wait Event Class Grouping
Wait Event , Session
V$SESSION_WAIT_HISTORY
10g NF. 10 V$SESSION_WAIT
Session Wait
V$EVENT_HISTOGRAM 10g NF. Instance Wait Event
( ) Wait Event
V$ACTIVE_SESSION_HISTORY
10g NF. Active Session 1 Active Session ,SQL, PQ , Event, Event OBJ#, FiLE#, BLOCK#
OWI - Dynamic Performance View
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
EVENT# NUMBER
EVENT_ID NUMBER
NAME VARCHAR2(64)PARAMETER1 VARCHAR2(64)PARAMETER2 VARCHAR2(64)PARAMETER3 VARCHAR2(64)WAIT_CLASS_
IDNUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)
V$EVENT_NAMEWait Event
10g Event hash
10g Wait_class_id : Class hashWait_class# : Wait Class Wait_class : Wait Class
OWI - Dynamic Performance View
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
V$SYSTEM_EVENTInstance Session Wait Event
OWI - Dynamic Performance View
EVENT VARCHAR2(64)TOTAL_WAITS NUMBER
TOTAL_TIMEOUTS NUMBER
TIME_WAITED NUMBER
AVERAGE_WAIT NUMBER
TIME_WAITED_MICRO
NUMBER
EVENT_ID NUMBER
WAIT_CLASS_ID NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)
10g
9i Microsecond(1/1,000,000)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$SESSION_EVENT
Session Level Event Data
SID NUMBER
EVENT VARCHAR2(64)TOTAL_WAITS NUMBER
TOTAL_TIMEOUTS NUMBER
TIME_WAITED NUMBER
AVERAGE_WAIT NUMBER
MAX_WAIT NUMBER
TIME_WAITED_MICRO
NUMBER
EVENT_ID NUMBER
WAIT_CLASS_ID NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)
10g
9i
8 Session Event 1/100
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$SESSION_WAIT
Session Wait Event SECONDS_IN_WAIT 3
10g
WAITED UNKNOWN TIME : (T=False)WAITED SHORT TIME : 1/100 sec WAITING : WAITED KNOWN TIME :
SID NUMBER
SEQ# NUMBER
EVENT VARCHAR2(64)P1TEXT VARCHAR2(64)P1 NUMBER
P3RAW RAW(4)
WAIT_CLASS_ID NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)WAIT_TIME NUMBER
SECONDS_IN_WAIT
NUMBER
STATE VARCHAR2(19)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$SYSTEM_WAIT_CLASS
10g ViewInstance Instance Level Class
WAIT_CLASS_ID
NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)
TOTAL_WAITS NUMBER
TIME_WAITED NUMBER
WAIT_CLASS# WAIT_CLASS----------- ------------------0 Other1 Application2 Configuration3 Administrative4 Concurrency5 Commit6 Idle7 Network8 User I/O9 System I/O
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$SESSION_WAIT_CLASS
10g ViewInstance Session Level Class
SID NUMBER
SERIAL# NUMBER
WAIT_CLASS_ID
NUMBER
WAIT_CLASS# NUMBER
WAIT_CLASS VARCHAR2(64)TOTAL_WAITS NUMBER
TIME_WAITED NUMBER
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$SESSION_WAIT_HISTORY
10g View Session 10 Wait Event
SID NUMBER
SEQ# NUMBER
EVENT# NUMBER
EVENT VARCHAR2(64)P1TEXT VARCHAR2(64)P1 NUMBER
P2TEXT VARCHAR2(64)P2 NUMBER
P3TEXT VARCHAR2(64)P3 NUMBER
WAIT_TIME NUMBER
WAIT_COUNT NUMBER
Session Wait Event 10g R1 1
Wait Event Session Wait_Time = 0 : Wait_Time > 0 :
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$EVENT_HISTOGRAM
10g View Wait Event , Histogram Bucket
milli-second(1/1,000) bucket 2
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
ForegroundBackground
OWI - Dynamic Performance ViewV$ACTIVE_SESSION_HISTORY
10g View Active Session Historical
WHEN SAMPLE_ID NUMBERSAMPLE_TIME TIMESTAMP
(3)SESSION
SESSION_ID NUMBER
SESSION_SERIAL# NUMBER
USER_ID NUMBER
SERVICE_HASH NUMBER
SESSION_TYPE VARCHAR2(10)PROGRAM VARCHAR2(48)MODULE VARCHAR2(48)ACTION VARCHAR2(32)CLIENT_ID VARCHAR2(64)
STATE SESSION_STATE VARCHAR2(7)WAIT_TIME NUMBER
Waiting : On CPU : Service
Wait Event Session Wait_Time = 0 : Wait_Time > 0 :
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$ACTIVE_SESSION_HISTORY
SESSION_STATE = WAITING Waiting
Blocking Session ValidNo HolderGlobalNot In WaitUnknown
WAIT EVENT VARCHAR2(64)EVENT_ID NUMBER
EVENT# NUMBER
SEQ# NUMBER
P1 NUMBER
P2 NUMBER
P3 NUMBER
WAIT_CLASS VARCHAR2(64)WAIT_CLASS_ID NUMBER
WAIT_TIME NUMBER
TIME_WAITED NUMBER
BLOCKING_SESSION NUMBER
BLOCKING_SESSION_STATUS
VARCHAR2(11)BLOCKING_SESSION_SERI
AL#NUMBER
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Dynamic Performance ViewV$ACTIVE_SESSION_HISTORY
Parallel Query Coordinator
SQL SQL_ID VARCHAR2(13)SQL_CHILD_NUMBER NUMBER
SQL_PLAN_HASH_VALUE NUMBER
FORCE_MATCHING_SIGNATURE
NUMBER
SQL_OPCODE NUMBER
QC_SESSION_ID NUMBER
QC_INSTANCE_ID NUMBER
OTHERS
XID RAW(8)
CURRENT_OBJ# NUMBER
CURRENT_FILE# NUMBER
CURRENT_BLOCK# NUMBER
CURSOR_SHARING FORCE
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
Wait Event Dynamic Performance View
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
20 Batch 2 ? ?
Developer
DBA
Source Code ? .. Index , .
DBA
. Job .Monitoring .
20 ? ??
Developer
OWI - Historical Performance Data
1/32/33/3
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
20 Batch 2 ? ?
Developer
DBA
Batch ,Data Fetch SQL Latch free (cache buffers chains ) 1 . SQL Block Access . Data Enqueue Lock 40 .Lock Holder DML.Job Scheduling . !!
OWI - Historical Performance Data
1/1
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
OWI - Historical Performance Data
System Level 10046 Trace
Statspack (8.1.6~)
Logoff Database Trigger (8i~)
SGA Direct Access
Data
Session Level Data
Session WAS
, Active Session List
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
AWR (Automatic Workload Repository)
AWR 10g Tuning
Automatic Database Diagnostic MonitorSQL Access AdvisorSQL Tuning AdvisorUNDO AdvisorSegment Advisor
(Default :1 , 1 ) Background Process
MMON (Memory Monitor)
MMNL (Memory Monitor Light) UNDO Advisor, ASH (Active Session History)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
AWR EM, DBMS_WORKLOAD_REPOSITORY Package
AWR (Automatic Workload Repository)
AWR SQL> SELECT DBID, SNAP_INTERVAL, RETENTION FROM dba_hist_wr_control;
DBID SNAP_INTERVAL RETENTION---------------- -------------------- ------------------3908528128 +00000 01:00:00.0 +00007 00:00:00.0
SQL> SELECT occupant_desc,space_usage_kbytes2 FROM v$sysaux_occupants WHERE occupant_name='SM/AWR';
OCCUPANT_DESC SPACE_USAGE_KBYTES------------------------------------------------------ ------------------Server Manageability - Automatic Workload Repository 50304
AWR SQL> EXEC DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS (DBID => 3908528128,INTERVAL => 0,RETENTION => 0);
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
ASH (Active Session History)
ASH 10g Setup Active Session SamplingSGA ASH Buffer
ASH Buffer 1MB 128MB 1 SamplingASH Buffer Circular Buffer 1 Buffer 2/3 Disk Flush10 Row 1 Row Sampling
SQL> select * from v$sgastat where name like 'ASH buffers';
POOL NAME BYTES------------ -------------------------- ----------shared pool ASH buffers 4194304
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
ASH (Active Session History)
ASH ComponentASH Buffers (Shared Pool Fixed Area)V$ACTIVE_SESSION_HISTORYX$ASHDBA_HIST_ACTIVE_SESS_HISTORY
V$ACTIVE_SESSION_HISTORY Memory ASH DB_ID, INSTANCE_NUMBER, SNAP_ID AWR (Automatic Workload Repository)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
ASH (Active Session History)
ASH ParameterSTATISTICS_LEVEL = Typical(Default) All
Typical Level _ASH_SAMPLING_INTERVAL = 1000 (Milliseconds)
ASH Sampling _ASH_DISK_FILTER_RATIO = 10
Disk _ASH_ENABLE = TRUE
ASH
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
ASH (Active Session History)
V$ACTIVE_SESSION_HISTORY
AWR ORbuffer 2/3 fullMMON Lite
(MMNL)
Indexed on time
SessionStateObjects
V$SESSIONV$SESSION_WAIT
Circular bufferIn SGA(2MB per CPU)
DBA_HIST_ACTIVE_SESSION_HISTORY
Samples with variable size rows Direct-path
inserts
WRH$_ACTIVE_SESSION_HISTORY
Readers Unlatched
Indexed on time
Write
Read
10 1
ASH Architecture
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
10046 TRACE SQL_TRACE , Level
LEVEL 4 : SQL Trace Bind LEVEL 8 : SQL Trace Wait LEVEL12: SQL Trace , Bind , Wait
SQL Trace
SQL> alter session set events 10046 trace name context forever, level 12;
SQL> exec sys.dbms_system.set_bool_param_in_session (sid=>100, serial=>123, parname=> TIMED_STATISTICS, bval=>true);
SQL> exec sys.dbms_system.set_int_param_in_session (sid=> 100, serial=> 123, parname=>MAX_DUMP_FILE_SIZE, intval=>2147483647);
SQL> exec sys.dbms_system.set_ev (sid, serial, 10046, 8, );
SQL> exec dbms_monitor.serv_mod_act_trace_enable('ORA10GX','Mod1');SQL> exec dbms_application_info.set_module('Mod1','Act1');SQL> select count(*) from sale where item_id=200;
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
SQL Trace
Trace SQL> EXEC DBMS_MONITOR.SESSSION_TRACE_ENABLE(NULL,NULL,TRUE,TRUE);SQL> SELECT * FROM T_BUFFER_BUSY_WAITS;=====================PARSING IN CURSOR #1 len=41 dep=0 uid=57 oct=3 lid=57 tim=249544025505 hv=1016797626 ad='229ed678'SELECT COUNT(*) FROM T_BUFFER_BUSY_WAITSEND OF STMTPARSE #1:c=0,e=4132,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=249544025498BINDS #1:EXEC #1:c=0,e=227,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=249544025883WAIT #1: nam='SQL*Net message to client' ela= 3 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=249544025980WAIT #1: nam='SQL*Net message from client' ela= 4147 driver id=1413697536 #bytes=1 p3=0 obj#=-1 tim=249544030275WAIT #1: nam='db file sequential read' ela= 11010 file#=7 block#=24350 blocks=1 obj#=52058 tim=249544041989WAIT #1: nam='SQL*Net message to client' ela= 3 driver id=1413697536 #bytes=1 p3=0 obj#=52058 tim=249544046547FETCH #1:c=0,e=16245,p=1,cr=3,cu=0,mis=0,r=1,dep=0,og=1,tim=249544046628WAIT #1: nam='SQL*Net message from client' ela= 5363 driver id=1413697536 #bytes=1 p3=0 obj#=52058 tim=249544052170
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
SQL Trace
tkprof ############################################################################### SELECT COUNT(*) FROM T_BUFFER_BUSY_WAITScall count cpu elapsed disk query current rows mis Wait Ela------- ------ -------- ---------- ---------- ---------- ---------- ---------- ---------- ----------Parse 1 0.00 0.00 0 0 0 0 0 0.00Exec 1 0.00 0.00 0 0 0 0 0 0.00Fetch 1 0.00 0.02 1 3 0 1 0 0.02------- ------ -------- ---------- ---------- ---------- ---------- ---------- ---------- ----------Total 3 0.00 0.02 1 3 0 1 0 0.02Event waited on Count Zero Ela Elapse AVG(Ela) MAX(Ela) Blocks---------------------------------------- -------- -------- ---------- ---------- ---------- --------db file sequential read 1 0 0.01 0.01 0.01 1SQL*Net message to client 2 0 0.00 0.00 0.00 0SQL*Net message from client 2 0 0.01 0.00 0.01 0Rows Row Source Operation---------- ---------------------------------------------------1 SORT AGGREGATE (cr=3 pr=1 pw=0 time=16208 us)0 TABLE ACCESS FULL T_BUFFER_BUSY_WAITS (cr=3 pr=1 pw=0 time=16111 us)
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
10046 Trace Alter SessionDBMS_SYSTEMDBMS_MONITORTKPROFRaw Trace File
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
AWR DBMS_WORKLOAD_REPOSITORYDBA_HIST_ACTIVE_SESS_HISTORYawrrpt
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Practical OWI SeminarConcept & OWI
Copyrights 2001~2006, EXEM Co., LTD. All rights reserved.
Copyrights 2001~2006, EXEM CO., LTD. All Rights Reserved. .