Oracle_AWR_報告分析實例講解

WORKLOAD REPOSITORY report for

DB Namephp

DB Id算法

Instancesql

Inst num數據庫

Release安全

RACsession

Host數據結構

ICCI併發

1314098396socket

ICCI1ide

1

10.2.0.3.0

YES

HPGICCI1

 

 

 

Snap Id

Snap Time

Sessions

Cursors/Session

Begin Snap:

2678

25-Dec-08 14:04:50

24

1.5

End Snap:

2680

25-Dec-08 15:23:37

26

1.5

Elapsed:

 

78.79 (mins)

 

 

DB Time:

 

11.05 (mins)

 

 

DB Time不包括Oracle後臺進程消耗的時間。若是DB Time遠遠小於Elapsed時間,說明數據庫比較空閒。

在79分鐘裏(其間收集了3次快照數據),數據庫耗時11分鐘,RDA數據中顯示系統有8個邏輯CPU(4個物理CPU),平均每一個CPU耗時1.4分鐘,CPU利用率只有大約2%(1.4/79)。說明系統壓力很是小。

但是對於批量系統,數據庫的工做負載老是集中在一段時間內。若是快照週期不在這一段時間內,或者快照週期跨度太長而包含了大量的數據庫空閒時間,所得出的分析結果是沒有意義的。這也說明選擇分析時間段很關鍵,要選擇可以表明性能問題的時間段。

 

Report Summary

Cache Sizes

 

Begin

End

 

 

Buffer Cache:

3,344M

3,344M

Std Block Size:

8K

Shared Pool Size:

704M

704M

Log Buffer:

14,352K

顯示SGA中每一個區域的大小(在AMM改變它們以後),可用來與初始參數值比較。

shared pool主要包括library cache和dictionary cache。library cache用來存儲最近解析(或編譯)後SQL、PL/SQL和Java classes等。library cache用來存儲最近引用的數據字典。發生在library cache或dictionary cache的cache miss代價要比發生在buffer cache的代價高得多。所以shared pool的設置要確保最近使用的數據都能被cache。

Load Profile

 

Per Second

Per Transaction

Redo size:

918,805.72

775,912.72

Logical reads:

3,521.77

2,974.06

Block changes:

1,817.95

1,535.22

Physical reads:

68.26

57.64

Physical writes:

362.59

306.20

User calls:

326.69

275.88

Parses:

38.66

32.65

Hard parses:

0.03

0.03

Sorts:

0.61

0.51

Logons:

0.01

0.01

Executes:

354.34

299.23

Transactions:

1.18

 

 

% Blocks changed per Read:

51.62

Recursive Call %:

51.72

Rollback per transaction %:

85.49

Rows per Sort:

########

顯示數據庫負載概況,將之與基線數據比較才具備更多的意義,若是每秒或每事務的負載變化不大,說明應用運行比較穩定。單個的報告數據只說明應用的負載狀況,絕大多數據並無一個所謂「正確」的值,然而Logons大於每秒1~2個、Hard parses大於每秒100、所有parses超過每秒300代表可能有爭用問題。

Redo size:每秒/每事務產生的redo大小(單位字節),可標誌數據庫任務的繁重程序。

Logical reads:每秒/每事務邏輯讀的塊數

Block changes:每秒/每事務修改的塊數

Physical reads:每秒/每事務物理讀的塊數

Physical writes:每秒/每事務物理寫的塊數

User calls:每秒/每事務用戶call次數

Parses:SQL解析的次數

Hard parses:其中硬解析的次數,硬解析太多,說明SQL重用率不高。

Sorts:每秒/每事務的排序次數

Logons:每秒/每事務登陸的次數

Executes:每秒/每事務SQL執行次數

Transactions:每秒事務數

Blocks changed per Read:表示邏輯讀用於修改數據塊的比例

Recursive Call:遞歸調用佔全部操做的比率

Rollback per transaction:每事務的回滾率

Rows per Sort:每次排序的行數

注:

Oracle的硬解析和軟解析

  提到軟解析(soft parse)和硬解析(hard parse),就不能不說一下Oracle對sql的處理過程。當你發出一條sql語句交付Oracle,在執行和獲取結果前,Oracle對此sql將進行幾個步驟的處理過程:

  一、語法檢查(syntax check)

  檢查此sql的拼寫是否語法。

  二、語義檢查(semantic check)

  諸如檢查sql語句中的訪問對象是否存在及該用戶是否具有相應的權限。

  三、對sql語句進行解析(parse)

  利用內部算法對sql進行解析,生成解析樹(parse tree)及執行計劃(execution plan)。

  四、執行sql,返回結果(execute and return)

  其中,軟、硬解析就發生在第三個過程裏。

  Oracle利用內部的hash算法來取得該sql的hash值,而後在library cache裏查找是否存在該hash值;

  假設存在,則將此sql與cache中的進行比較;

  假設「相同」,就將利用已有的解析樹與執行計劃,而省略了優化器的相關工做。這也就是軟解析的過程。

  誠然,若是上面的2個假設中任有一個不成立,那麼優化器都將進行建立解析樹、生成執行計劃的動做。這個過程就叫硬解析。

  建立解析樹、生成執行計劃對於sql的執行來講是開銷昂貴的動做,因此,應當極力避免硬解析,儘可能使用軟解析。

Instance Efficiency Percentages (Target 100%)

Buffer Nowait %:

100.00

Redo NoWait %:

100.00

Buffer Hit %:

98.72

In-memory Sort %:

99.86

Library Hit %:

99.97

Soft Parse %:

99.92

Execute to Parse %:

89.09

Latch Hit %:

99.99

Parse CPU to Parse Elapsd %:

7.99

% Non-Parse CPU:

99.95

本節包含了Oracle關鍵指標的內存命中率及其它數據庫實例操做的效率。其中Buffer Hit Ratio 也稱Cache Hit Ratio,Library Hit ratio也稱Library Cache Hit ratio。同Load Profile一節相同,這一節也沒有所謂「正確」的值,而只能根據應用的特色判斷是否合適。在一個使用直接讀執行大型並行查詢的DSS環境,20%的Buffer Hit Ratio是能夠接受的,而這個值對於一個OLTP系統是徹底不能接受的。根據Oracle的經驗,對於OLTPT系統,Buffer Hit Ratio理想應該在90%以上。

Buffer Nowait表示在內存得到數據的未等待比例。

buffer hit表示進程從內存中找到數據塊的比率,監視這個值是否發生重大變化比這個值自己更重要。對於通常的OLTP系統,若是此值低於80%,應該給數據庫分配更多的內存。

Redo NoWait表示在LOG緩衝區得到BUFFER的未等待比例。若是過低(可參考90%閥值),考慮增長LOG BUFFER。

library hit表示Oracle從Library Cache中檢索到一個解析過的SQL或PL/SQL語句的比率,當應用程序調用SQL或存儲過程時,Oracle檢查Library Cache肯定是否存在解析過的版本,若是存在,Oracle當即執行語句;若是不存在,Oracle解析此語句,並在Library Cache中爲它分配共享SQL區。低的library hit ratio會致使過多的解析,增長CPU消耗,下降性能。若是library hit ratio低於90%,可能須要調大shared pool區。

Latch Hit:Latch是一種保護內存結構的鎖,能夠認爲是SERVER進程獲取訪問內存數據結構的許可。要確保Latch Hit>99%,不然意味着Shared Pool latch爭用,可能因爲未共享的SQL,或者Library Cache過小,可以使用綁定變動或調大Shared Pool解決。

Parse CPU to Parse Elapsd:解析實際運行時間/(解析實際運行時間+解析中等待資源時間),越高越好。

Non-Parse CPU :SQL實際運行時間/(SQL實際運行時間+SQL解析時間),過低表示解析消耗時間過多。

Execute to Parse:是語句執行與分析的比例,若是要SQL重用率高,則這個比例會很高。該值越高表示一次解析後被重複執行的次數越多。

In-memory Sort:在內存中排序的比率,若是太低說明有大量的排序在臨時表空間中進行。考慮調大PGA。

Soft Parse:軟解析的百分比(softs/softs+hards),近似看成sql在共享區的命中率,過低則須要調整應用使用綁定變量。

Shared Pool Statistics

 

Begin

End

Memory Usage %:

47.19

47.50

% SQL with executions>1:

88.48

79.81

% Memory for SQL w/exec>1:

79.99

73.52

Memory Usage %:對於一個已經運行一段時間的數據庫來講,共享池內存使用率,應該穩定在75%-90%間,若是過小,說明Shared Pool有浪費,而若是高於90,說明共享池中有爭用,內存不足。

SQL with executions>1:執行次數大於1的sql比率,若是此值過小,說明須要在應用中更多使用綁定變量,避免過多SQL解析。

Memory for SQL w/exec>1:執行次數大於1的SQL消耗內存的佔比。

Top 5 Timed Events

Event

Waits

Time(s)

Avg Wait(ms)

% Total Call Time

Wait Class

CPU time

 

515

 

77.6

 

SQL*Net more data from client

27,319

64

2

9.7

Network

log file parallel write

5,497

47

9

7.1

System I/O

db file sequential read

7,900

35

4

5.3

User I/O

db file parallel write

4,806

34

7

5.1

System I/O

這是報告概要的最後一節,顯示了系統中最嚴重的5個等待,按所佔等待時間的比例倒序列示。當咱們調優時,總但願觀察到最顯著的效果,所以應當從這裏入手肯定咱們下一步作什麼。例如若是‘buffer busy wait’是較嚴重的等待事件,咱們應當繼續研究報告中Buffer Wait和File/Tablespace IO區的內容,識別哪些文件致使了問題。若是最嚴重的等待事件是I/O事件,咱們應當研究按物理讀排序的SQL語句區以識別哪些語句在執行大量I/O,並研究Tablespace和I/O區觀察較慢響應時間的文件。若是有較高的LATCH等待,就須要察看詳細的LATCH統計識別哪些LATCH產生的問題。

在這裏,log file parallel write是相對比較多的等待,佔用了7%的CPU時間。

一般,在沒有問題的數據庫中,CPU time老是列在第一個。

更多的等待事件,參見本報告 的Wait Events一節。

 

RAC Statistics

 

Begin

End

Number of Instances:

2

2

Global Cache Load Profile

 

Per Second

Per Transaction

Global Cache blocks received:

4.16

3.51

Global Cache blocks served:

5.97

5.04

GCS/GES messages received:

408.47

344.95

GCS/GES messages sent:

258.03

217.90

DBWR Fusion writes:

0.05

0.05

Estd Interconnect traffic (KB)

211.16

 

Global Cache Efficiency Percentages (Target local+remote 100%)

Buffer access - local cache %:

98.60

Buffer access - remote cache %:

0.12

Buffer access - disk %:

1.28

Global Cache and Enqueue Services - Workload Characteristics

Avg global enqueue get time (ms):

0.1

Avg global cache cr block receive time (ms):

1.1

Avg global cache current block receive time (ms):

0.8

Avg global cache cr block build time (ms):

0.0

Avg global cache cr block send time (ms):

0.0

Global cache log flushes for cr blocks served %:

3.5

Avg global cache cr block flush time (ms):

3.9

Avg global cache current block pin time (ms):

0.0

Avg global cache current block send time (ms):

0.0

Global cache log flushes for current blocks served %:

0.4

Avg global cache current block flush time (ms):

3.0

Global Cache and Enqueue Services - Messaging Statistics

Avg message sent queue time (ms):

0.0

Avg message sent queue time on ksxp (ms):

0.3

Avg message received queue time (ms):

0.5

Avg GCS message process time (ms):

0.0

Avg GES message process time (ms):

0.0

% of direct sent messages:

14.40

% of indirect sent messages:

77.04

% of flow controlled messages:

8.56


Main Report


Wait Events Statistics

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Time Model Statistics

  • Total time in database user-calls (DB Time): 663s
  • Statistics including the word "background" measure background process time, and so do not contribute to the DB time statistic
  • Ordered by % or DB time desc, Statistic name

Statistic Name

Time (s)

% of DB Time

DB CPU

514.50

77.61

sql execute elapsed time

482.27

72.74

parse time elapsed

3.76

0.57

PL/SQL execution elapsed time

0.50

0.08

hard parse elapsed time

0.34

0.05

connection management call elapsed time

0.08

0.01

hard parse (sharing criteria) elapsed time

0.00

0.00

repeated bind elapsed time

0.00

0.00

PL/SQL compilation elapsed time

0.00

0.00

failed parse elapsed time

0.00

0.00

DB time

662.97

 

background elapsed time

185.19

 

background cpu time

67.48

 

此節顯示了各類類型的數據庫處理任務所佔用的CPU時間。

Back to Wait Events Statistics
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Wait Class

  • s - second
  • cs - centisecond - 100th of a second
  • ms - millisecond - 1000th of a second
  • us - microsecond - 1000000th of a second
  • ordered by wait time desc, waits desc

Wait Class

Waits

%Time -outs

Total Wait Time (s)

Avg wait (ms)

Waits /txn

User I/O

66,837

0.00

120

2

11.94

System I/O

28,295

0.00

93

3

5.05

Network

1,571,450

0.00

66

0

280.72

Cluster

210,548

0.00

29

0

37.61

Other

81,783

71.82

28

0

14.61

Application

333,155

0.00

16

0

59.51

Concurrency

5,182

0.04

5

1

0.93

Commit

919

0.00

4

4

0.16

Configuration

25,427

99.46

1

0

4.54

Back to Wait Events Statistics
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Wait Events

  • s - second
  • cs - centisecond - 100th of a second
  • ms - millisecond - 1000th of a second
  • us - microsecond - 1000000th of a second
  • ordered by wait time desc, waits desc (idle events last)

Event

Waits

%Time -outs

Total Wait Time (s)

Avg wait (ms)

Waits /txn

SQL*Net more data from client

27,319

0.00

64

2

4.88

log file parallel write

5,497

0.00

47

9

0.98

db file sequential read

7,900

0.00

35

4

1.41

db file parallel write

4,806

0.00

34

7

0.86

db file scattered read

10,310

0.00

31

3

1.84

direct path write

42,724

0.00

30

1

7.63

reliable message

355

2.82

18

49

0.06

SQL*Net break/reset to client

333,084

0.00

16

0

59.50

db file parallel read

3,732

0.00

13

4

0.67

gc current multi block request

175,710

0.00

10

0

31.39

control file sequential read

15,974

0.00

10

1

2.85

direct path read temp

1,873

0.00

9

5

0.33

gc cr multi block request

20,877

0.00

8

0

3.73

log file sync

919

0.00

4

4

0.16

gc cr block busy

526

0.00

3

6

0.09

enq: FB - contention

10,384

0.00

3

0

1.85

DFS lock handle

3,517

0.00

3

1

0.63

control file parallel write

1,946

0.00

3

1

0.35

gc current block 2-way

4,165

0.00

2

0

0.74

library cache lock

432

0.00

2

4

0.08

name-service call wait

22

0.00

2

76

0.00

row cache lock

3,894

0.00

2

0

0.70

gcs log flush sync

1,259

42.02

2

1

0.22

os thread startup

18

5.56

2

89

0.00

gc cr block 2-way

3,671

0.00

2

0

0.66

gc current block busy

113

0.00

1

12

0.02

SQL*Net message to client

1,544,115

0.00

1

0

275.83

gc buffer busy

15

6.67

1

70

0.00

gc cr disk read

3,272

0.00

1

0

0.58

direct path write temp

159

0.00

1

5

0.03

gc current grant busy

898

0.00

1

1

0.16

log file switch completion

29

0.00

1

17

0.01

CGS wait for IPC msg

48,739

99.87

0

0

8.71

gc current grant 2-way

1,142

0.00

0

0

0.20

kjbdrmcvtq lmon drm quiesce: ping completion

9

0.00

0

19

0.00

enq: US - contention

567

0.00

0

0

0.10

direct path read

138

0.00

0

1

0.02

enq: WF - contention

14

0.00

0

9

0.00

ksxr poll remote instances

13,291

58.45

0

0

2.37

library cache pin

211

0.00

0

1

0.04

ges global resource directory to be frozen

9

100.00

0

10

0.00

wait for scn ack

583

0.00

0

0

0.10

log file sequential read

36

0.00

0

2

0.01

undo segment extension

25,342

99.79

0

0

4.53

rdbms ipc reply

279

0.00

0

0

0.05

ktfbtgex

6

100.00

0

10

0.00

enq: HW - contention

44

0.00

0

1

0.01

gc cr grant 2-way

158

0.00

0

0

0.03

enq: TX - index contention

1

0.00

0

34

0.00

enq: CF - contention

64

0.00

0

1

0.01

PX Deq: Signal ACK

37

21.62

0

1

0.01

latch free

3

0.00

0

10

0.00

buffer busy waits

625

0.16

0

0

0.11

KJC: Wait for msg sends to complete

154

0.00

0

0

0.03

log buffer space

11

0.00

0

2

0.00

enq: PS - contention

46

0.00

0

1

0.01

enq: TM - contention

70

0.00

0

0

0.01

IPC send completion sync

40

100.00

0

0

0.01

PX Deq: reap credit

1,544

99.81

0

0

0.28

log file single write

36

0.00

0

0

0.01

enq: TT - contention

46

0.00

0

0

0.01

enq: TD - KTF dump entries

12

0.00

0

1

0.00

read by other session

1

0.00

0

12

0.00

LGWR wait for redo copy

540

0.00

0

0

0.10

PX Deq Credit: send blkd

17

5.88

0

0

0.00

enq: TA - contention

14

0.00

0

0

0.00

latch: ges resource hash list

44

0.00

0

0

0.01

enq: PI - contention

8

0.00

0

0

0.00

write complete waits

1

0.00

0

2

0.00

enq: DR - contention

3

0.00

0

0

0.00

enq: MW - contention

3

0.00

0

0

0.00

enq: TS - contention

3

0.00

0

0

0.00

PX qref latch

150

100.00

0

0

0.03

enq: MD - contention

2

0.00

0

0

0.00

latch: KCL gc element parent latch

11

0.00

0

0

0.00

enq: JS - job run lock - synchronize

1

0.00

0

1

0.00

SQL*Net more data to client

16

0.00

0

0

0.00

latch: cache buffers lru chain

1

0.00

0

0

0.00

enq: UL - contention

1

0.00

0

0

0.00

gc current split

1

0.00

0

0

0.00

enq: AF - task serialization

1

0.00

0

0

0.00

latch: object queue header operation

3

0.00

0

0

0.00

latch: cache buffers chains

1

0.00

0

0

0.00

latch: enqueue hash chains

2

0.00

0

0

0.00

SQL*Net message from client

1,544,113

0.00

12,626

8

275.83

gcs remote message

634,884

98.64

9,203

14

113.41

DIAG idle wait

23,628

0.00

4,616

195

4.22

ges remote message

149,591

93.45

4,612

31

26.72

Streams AQ: qmn slave idle wait

167

0.00

4,611

27611

0.03

Streams AQ: qmn coordinator idle wait

351

47.86

4,611

13137

0.06

Streams AQ: waiting for messages in the queue

488

100.00

4,605

9436

0.09

virtual circuit status

157

100.00

4,596

29272

0.03

PX Idle Wait

1,072

97.11

2,581

2407

0.19

jobq slave wait

145

97.93

420

2896

0.03

Streams AQ: waiting for time management or cleanup tasks

1

100.00

270

269747

0.00

PX Deq: Parse Reply

40

40.00

0

3

0.01

PX Deq: Execution Msg

121

26.45

0

0

0.02

PX Deq: Join ACK

38

42.11

0

1

0.01

PX Deq: Execute Reply

34

32.35

0

0

0.01

PX Deq: Msg Fragment

16

0.00

0

0

0.00

Streams AQ: RAC qmn coordinator idle wait

351

100.00

0

0

0.06

class slave wait

2

0.00

0

0

0.00

db file scattered read等待事件是當SESSION等待multi-block I/O時發生的,經過是因爲full table scans或 index fast full scans。發生過多讀操做的Segments能夠在「Segments by Physical Reads」和 「SQL ordered by Reads」節中識別(在其它版本的報告中,多是別的名稱)。若是在OLTP應用中,不該該有過多的全掃描操做,而應使用選擇性好的索引操做。

DB file sequential read等待意味着發生順序I/O讀等待(一般是單塊讀取到連續的內存區域中),若是這個等待很是嚴重,應該使用上一段的方法肯定執行讀操做的熱點SEGMENT,而後經過對大表進行分區以減小I/O量,或者優化執行計劃(經過使用存儲大綱或執行數據分析)以免單塊讀操做引發的sequential read等待。經過在批量應用中,DB file sequential read是很影響性能的事件,老是應當設法避免。

Log File Parallel Write事件是在等待LGWR進程將REDO記錄從LOG 緩衝區寫到聯機日誌文件時發生的。雖然寫操做多是併發的,但LGWR須要等待最後的I/O寫到磁盤上才能認爲並行寫的完成,所以等待時間依賴於OS完成全部請求的時間。若是這個等待比較嚴重,能夠經過將LOG文件移到更快的磁盤上或者條帶化磁盤(減小爭用)而下降這個等待。

Buffer Busy Waits事件是在一個SESSION須要訪問BUFFER CACHE中的一個數據庫塊而又不能訪問時發生的。緩衝區「busy」的兩個緣由是:1)另外一個SESSION正在將數據塊讀進BUFFER。2)另外一個SESSION正在以排它模式佔用着這塊被請求的BUFFER。能夠在「Segments by Buffer Busy Waits」一節中找出發生這種等待的SEGMENT,而後經過使用reverse-key indexes並對熱表進行分區而減小這種等待事件。

Log File Sync事件,當用戶SESSION執行事務操做(COMMIT或ROLLBACK等)後,會通知 LGWR進程將所須要的全部REDO信息從LOG BUFFER寫到LOG文件,在用戶SESSION等待LGWR返回安全寫入磁盤的通知時發生此等待。減小此等待的方法寫Log File Parallel Write事件的處理。

Enqueue Waits是串行訪問本地資源的本鎖,代表正在等待一個被其它SESSION(一個或多個)以排它模式鎖住的資源。減小這種等待的方法依賴於生產等待的鎖類型。致使Enqueue等待的主要鎖類型有三種:TX(事務鎖), TM D(ML鎖)和ST(空間管理鎖)。

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Background Wait Events

  • ordered by wait time desc, waits desc (idle events last)

Event

Waits

%Time -outs

Total Wait Time (s)

Avg wait (ms)

Waits /txn

log file parallel write

5,497

0.00

47

9

0.98

db file parallel write

4,806

0.00

34

7

0.86

events in waitclass Other

69,002

83.25

22

0

12.33

control file sequential read

9,323

0.00

7

1

1.67

control file parallel write

1,946

0.00

3

1

0.35

os thread startup

18

5.56

2

89

0.00

direct path read

138

0.00

0

1

0.02

db file sequential read

21

0.00

0

5

0.00

direct path write

138

0.00

0

0

0.02

log file sequential read

36

0.00

0

2

0.01

gc cr block 2-way

96

0.00

0

0

0.02

gc current block 2-way

78

0.00

0

0

0.01

log buffer space

11

0.00

0

2

0.00

row cache lock

59

0.00

0

0

0.01

log file single write

36

0.00

0

0

0.01

buffer busy waits

151

0.66

0

0

0.03

gc current grant busy

29

0.00

0

0

0.01

library cache lock

4

0.00

0

1

0.00

enq: TM - contention

10

0.00

0

0

0.00

gc current grant 2-way

8

0.00

0

0

0.00

gc cr multi block request

7

0.00

0

0

0.00

gc cr grant 2-way

5

0.00

0

0

0.00

rdbms ipc message

97,288

73.77

50,194

516

17.38

gcs remote message

634,886

98.64

9,203

14

113.41

DIAG idle wait

23,628

0.00

4,616

195

4.22

pmon timer

1,621

100.00

4,615

2847

0.29

ges remote message

149,591

93.45

4,612

31

26.72

Streams AQ: qmn slave idle wait

167

0.00

4,611

27611

0.03

Streams AQ: qmn coordinator idle wait

351

47.86

4,611

13137

0.06

smon timer

277

6.50

4,531

16356

0.05

Streams AQ: waiting for time management or cleanup tasks

1

100.00

270

269747

0.00

PX Deq: Parse Reply

40

40.00

0

3

0.01

PX Deq: Join ACK

38

42.11

0

1

0.01

PX Deq: Execute Reply

34

32.35

0

0

0.01

Streams AQ: RAC qmn coordinator idle wait

351

100.00

0

0

0.06

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Operating System Statistics

Statistic

Total

NUM_LCPUS

0

NUM_VCPUS

0

AVG_BUSY_TIME

101,442

AVG_IDLE_TIME

371,241

AVG_IOWAIT_TIME

5,460

AVG_SYS_TIME

25,795

AVG_USER_TIME

75,510

BUSY_TIME

812,644

IDLE_TIME

2,971,077

IOWAIT_TIME

44,794

SYS_TIME

207,429

USER_TIME

605,215

LOAD

0

OS_CPU_WAIT_TIME

854,100

RSRC_MGR_CPU_WAIT_TIME

0

PHYSICAL_MEMORY_BYTES

8,589,934,592

NUM_CPUS

8

NUM_CPU_CORES

4

NUM_LCPUS:                  若是顯示0,是由於沒有設置LPARS

NUM_VCPUS:                    同上。

AVG_BUSY_TIME:           BUSY_TIME / NUM_CPUS

AVG_IDLE_TIME:             IDLE_TIME / NUM_CPUS

AVG_IOWAIT_TIME:              IOWAIT_TIME / NUM_CPUS

AVG_SYS_TIME:               SYS_TIME / NUM_CPUS

AVG_USER_TIME:            USER_TIME / NUM_CPUSar o

BUSY_TIME:                      time equiv of %usr+%sys in sar output

IDLE_TIME:                        time equiv of %idle in sar

IOWAIT_TIME:                  time equiv of %wio in sar

SYS_TIME:                          time equiv of %sys in sar

USER_TIME:                       time equiv of %usr in sar

LOAD:                                  未知

OS_CPU_WAIT_TIME:      supposedly time waiting on run queues

RSRC_MGR_CPU_WAIT_TIME:   time waited coz of resource manager

PHYSICAL_MEMORY_BYTES:    total memory in use supposedly

NUM_CPUS:                       number of CPUs reported by OS

NUM_CPU_CORES:          number of CPU sockets on motherboard

總的elapsed time也能夠用以公式計算:

BUSY_TIME + IDLE_TIME + IOWAIT TIME

或:SYS_TIME + USER_TIME + IDLE_TIME + IOWAIT_TIME

 (由於BUSY_TIME = SYS_TIME+USER_TIME)

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Service Statistics

  • ordered by DB Time

Service Name

DB Time (s)

DB CPU (s)

Physical Reads

Logical Reads

ICCI

608.10

496.60

315,849

16,550,972

SYS$USERS

54.70

17.80

6,539

58,929

ICCIXDB

0.00

0.00

0

0

SYS$BACKGROUND

0.00

0.00

282

38,990

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Service Wait Class Stats

  • Wait Class info for services in the Service Statistics section.
  • Total Waits and Time Waited displayed for the following wait classes: User I/O, Concurrency, Administrative, Network
  • Time Waited (Wt Time) in centisecond (100th of a second)

Service Name

User I/O Total Wts

User I/O Wt Time

Concurcy Total Wts

Concurcy Wt Time

Admin Total Wts

Admin Wt Time

Network Total Wts

Network Wt Time

ICCI

59826

8640

4621

338

0

0

1564059

6552

SYS$USERS

6567

3238

231

11

0

0

7323

3

SYS$BACKGROUND

443

115

330

168

0

0

0

0

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SQL Statistics

本節按各類資源分別列出對資源消耗最嚴重的SQL語句,並顯示它們所佔統計期內所有資源的比例,這給出咱們調優指南。例如在一個系統中,CPU資源是系統性能瓶頸所在,那麼優化buffer gets最多的SQL語句將得到最大效果。在一個I/O等待是最嚴重事件的系統中,調優的目標應該是physical IOs最多的SQL語句。

在STATSPACK報告中,沒有完整的SQL語句,可以使用報告中的Hash Value經過下面語句從數據庫中查到:

select sql_text

from stats$sqltext

where hash_value = &hash_value

order by piece;

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SQL ordered by Elapsed Time

  • Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
  • % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100

Elapsed Time (s)

CPU Time (s)

Executions

Elap per Exec (s)

% Total DB Time

SQL Id

SQL Module

SQL Text

93

57

1

93.50

14.10

d8z0u8hgj8xdy

cuidmain@HPGICCI1 (TNS V1-V3)

insert into CUID select CUID_...

76

75

172,329

0.00

11.52

4vja2k2gdtyup

load_fnsact@HPGICCI1 (TNS V1-V3)

insert into ICCICCS values (:...

58

42

1

58.04

8.75

569r5k05drsj7

cumimain@HPGICCI1 (TNS V1-V3)

insert into CUMI select CUSV_...

51

42

1

50.93

7.68

ackxqhnktxnbc

cusmmain@HPGICCI1 (TNS V1-V3)

insert into CUSM select CUSM_...

38

36

166,069

0.00

5.67

7gtztzv329wg0

 

select c.name, u.name from co...

35

3

1

35.00

5.28

6z06gcfw39pkd

SQL*Plus

SELECT F.TABLESPACE_NAME, TO_...

23

23

172,329

0.00

3.46

1dm3bq36vu3g8

load_fnsact@HPGICCI1 (TNS V1-V3)

insert into iccifnsact values...

15

11

5

2.98

2.25

djs2w2f17nw2z

 

DECLARE job BINARY_INTEGER := ...

14

14

172,983

0.00

2.16

7wwv1ybs9zguz

load_fnsact@HPGICCI1 (TNS V1-V3)

update ICCIFNSACT set BORM_AD...

13

13

172,337

0.00

2.00

gmn2w09rdxn14

load_oldnewact@HPGICCI1 (TNS V1-V3)

insert into OLDNEWACT values ...

13

13

166,051

0.00

1.89

chjmy0dxf9mbj

icci_migact@HPGICCI1 (TNS V1-V3)

insert into ICCICCS values (:...

10

4

1

9.70

1.46

0yv9t4qb1zb2b

cuidmain@HPGICCI1 (TNS V1-V3)

select CUID_CUST_NO , CUID_ID_...

10

8

5

1.91

1.44

1crajpb7j5tyz

 

INSERT INTO STATS$SGA_TARGET_A...

8

8

172,329

0.00

1.25

38apjgr0p55ns

load_fnsact@HPGICCI1 (TNS V1-V3)

update ICCICCS set CCSMAXOVER...

8

8

172,983

0.00

1.16

5c4qu2zmj3gux

load_fnsact@HPGICCI1 (TNS V1-V3)

select * from ICCIPRODCODE wh...

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SQL ordered by CPU Time

  • Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code.
  • % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100

CPU Time (s)

Elapsed Time (s)

Executions

CPU per Exec (s)

% Total DB Time

SQL Id

SQL Module

SQL Text

75

76

172,329

0.00

11.52

4vja2k2gdtyup

load_fnsact@HPGICCI1 (TNS V1-V3)

insert into ICCICCS values (:...

57

93

1

57.31

14.10

d8z0u8hgj8xdy

cuidmain@HPGICCI1 (TNS V1-V3)

insert into CUID select CUID_...

42

51

1

42.43

7.68

ackxqhnktxnbc

cusmmain@HPGICCI1 (TNS V1-V3)

insert into CUSM select CUSM_...

42

58

1

42.01

8.75

569r5k05drsj7

cumimain@HPGICCI1 (TNS V1-V3)

insert into CUMI select CUSV_...

36

38

166,069

0.00

5.67

7gtztzv329wg0

 

select c.name, u.name from co...

23

23

172,329

0.00

3.46

1dm3bq36vu3g8

load_fnsact@HPGICCI1 (TNS V1-V3)

insert into iccifnsact values...

14

14

172,983

0.00

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