01.concept owi

Practical OWI SeminarConcept & OWI

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Practical OWI Seminar

Concept & OWI



OWI CONCEPT

OWI OWI

Wait EventDynamic Performance ViewHistorical Performance Data

AWR (Automatic Workload Repository)ASH (Active Session History)SQL Trace



? OWI

?

, , ?

CPU, MEMORY, Response Time, Logical Reads, Physical Reads

?

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Process

OWI



(Critical Path) OWI

DB Server

Response Time

Network DatabaseWeb

Databasefile App

Network

Web Server

FileServer

Application Server

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Process Status & Oracle Wait Events

OWI

WAITINGRUNNINGIDLE

db file scattered readdb file sequential readlatch freeenqueuelog file sync

1/52/53/54/55/5



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)



OWI

Wait Event

Dynamic Performance View

HistoricalPerformanceData



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



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



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



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




V$SYSTEM_EVENTInstance Session Wait Event


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


10g

9i Microsecond(1/1,000,000)



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# NUMBER


10g

9i

8 Session Event 1/100



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# NUMBER

WAIT_CLASS VARCHAR2(64)WAIT_TIME NUMBER

SECONDS_IN_WAIT

NUMBER

STATE VARCHAR2(19)



OWI - Dynamic Performance ViewV$SYSTEM_WAIT_CLASS

10g ViewInstance Instance Level Class

WAIT_CLASS_ID

NUMBER

WAIT_CLASS# NUMBER


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



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



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 :



OWI - Dynamic Performance ViewV$EVENT_HISTOGRAM

10g View Wait Event , Histogram Bucket

milli-second(1/1,000) bucket 2



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 :




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




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



Wait Event Dynamic Performance View



20 Batch 2 ? ?

Developer

DBA

Source Code ? .. Index , .

DBA

. Job .Monitoring .

20 ? ??

Developer

OWI - Historical Performance Data

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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 . !!


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System Level 10046 Trace

Statspack (8.1.6~)

Logoff Database Trigger (8i~)

SGA Direct Access

Data

Session Level Data

Session WAS

, Active Session List



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)



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);



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




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)




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




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



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;



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



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)



10046 Trace Alter SessionDBMS_SYSTEMDBMS_MONITORTKPROFRaw Trace File



AWR DBMS_WORKLOAD_REPOSITORYDBA_HIST_ACTIVE_SESS_HISTORYawrrpt

01.concept owi

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