성능 문제의 분석 방향

13620 단어 Oracle일기.
            ,           
          ,                。           ,            ,             ,              。

            ,   SELECT * FROM  WHERE ROWNUM<100,         。              ,        ,   IMP   ,      ,       。        ,          ,     。

       10046   。10   ,   QQ TRACE    :

SELECT *
FROM
ttt where rownum<100
call count cpu elapsed disk query current rows
------- ------ -------- ---------- ---------- ---------- ---------- ----------
Parse 1 0.14 0.17 44 198 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 8 3.71 5.86 67489 68340 0 99
------- ------ -------- ---------- ---------- ---------- ---------- ----------
total 10 3.85 6.03 67533 68538 0 99
     ,     67533     68538    。     6.03 。       :

BINDS #39:
EXEC #39:c=0,e=88,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,tim=1422207486718
WAIT #39: nam='SQL*Net message to client' ela= 7 driver id=1650815232 #bytes=1 p3=0 obj#=206418 tim=1422207486810
WAIT #39: nam='SQL*Net more data to client' ela= 203 driver id=1650815232 #bytes=2002 p3=0 obj#=206418 tim=1422207487071
WAIT #39: nam='SQL*Net more data to client' ela= 66 driver id=1650815232 #bytes=2020 p3=0 obj#=206418 tim=1422207487175
WAIT #39: nam='db file scattered read' ela= 515 file#=146 block#=92900 blocks=5 obj#=206418 tim=1422207488208
WAIT #39: nam='db file scattered read' ela= 918 file#=146 block#=92905 blocks=8 obj#=206418 tim=1422207489579
WAIT #39: nam='db file scattered read' ela= 2121 file#=146 block#=92914 blocks=7 obj#=206418 tim=1422207492091
WAIT #39: nam='db file scattered read' ela= 617 file#=146 block#=92921 blocks=8 obj#=206418 tim=1422207493135
WAIT #39: nam='db file scattered read' ela= 493 file#=146 block#=92930 blocks=7 obj#=206418 tim=1422207494016
WAIT #39: nam='db file scattered read' ela= 1666 file#=147 block#=897417 blocks=8 obj#=206418 tim=1422207496049
WAIT #39: nam='db file scattered read' ela= 1026 file#=147 block#=897426 blocks=7 obj#=206418 tim=1422207497350
WAIT #39: nam='db file scattered read' ela= 378 file#=147 block#=897433 blocks=8 obj#=206418 tim=1422207498049
WAIT #39: nam='db file scattered read' ela= 1075 file#=147 block#=897442 blocks=7 obj#=206418 tim=1422207499416
WAIT #39: nam='db file scattered read' ela= 1649 file#=147 block#=897449 blocks=3 obj#=206418 tim=1422207501237
WAIT #39: nam='db file scattered read' ela= 2768 file#=147 block#=897453 blocks=4 obj#=206418 tim=1422207504191
WAIT #39: nam='db file scattered read' ela= 653 file#=147 block#=897458 blocks=7 obj#=206418 tim=1422207505141
WAIT #39: nam='db file scattered read' ela= 1588 file#=147 block#=897465 blocks=8 obj#=206418 tim=1422207507029
WAIT #39: nam='db file scattered read' ela= 460 file#=147 block#=897474 blocks=7 obj#=206418 tim=1422207507787
WAIT #39: nam='db file scattered read' ela= 608 file#=147 block#=897481 blocks=8 obj#=206418 tim=1422207508697
WAIT #39: nam='db file scattered read' ela= 564 file#=147 block#=897490 blocks=7 obj#=206418 tim=1422207509571
WAIT #39: nam='db file scattered read' ela= 832 file#=147 block#=897497 blocks=8 obj#=206418 tim=1422207510668
WAIT #39: nam='db file scattered read' ela= 846 file#=148 block#=102411 blocks=16 obj#=206418 tim=1422207512030
WAIT #39: nam='db file scattered read' ela= 4872 file#=148 block#=102427 blocks=16 obj#=206418 tim=1422207517488
WAIT #39: nam='db file scattered read' ela= 1624 file#=148 block#=102443 blocks=16 obj#=206418 tim=1422207520062
       DB FILE SCATTERD READ。          ,         。    SCATTERD READ    file#=146 block#=92900,     alter system dump datafile 146 block min 92900 block max 92904。       :

data_block_dump,data header at 0x6000000000208e64
===============
tsiz: 0x1f98
hsiz: 0x4c
pbl: 0x6000000000208e64
bdba: 0x24816ae4
76543210
flag=--------
ntab=1
nrow=29
frre=0
fsbo=0x4c
fseo=0xf7
avsp=0x1f4c
tosp=0x1f4c
0xe:pti[0] nrow=29 offs=0
0x12:pri[0] sfll=1
0x14:pri[1] sfll=2
0x16:pri[2] sfll=3
0x18:pri[3] sfll=4
0x1a:pri[4] sfll=5
0x1c:pri[5] sfll=6
0x1e:pri[6] sfll=7
0x20:pri[7] sfll=8
0x22:pri[8] sfll=9
0x24:pri[9] sfll=10
0x26:pri[10] sfll=11
0x28:pri[11] sfll=12
0x2a:pri[12] sfll=13
0x2c:pri[13] sfll=14
0x2e:pri[14] sfll=15
0x30:pri[15] sfll=16
0x32:pri[16] sfll=17
0x34:pri[17] sfll=18
0x36:pri[18] sfll=19
0x38:pri[19] sfll=20
0x3a:pri[20] sfll=21
0x3c:pri[21] sfll=22
0x3e:pri[22] sfll=23
0x40:pri[23] sfll=24
0x42:pri[24] sfll=25
0x44:pri[25] sfll=26
0x46:pri[26] sfll=27
0x48:pri[27] sfll=28
0x4a:pri[28] sfll=-1
block_row_dump:
end_of_block_dump
       。       ALTER TABLE  MOVE;    ,    12G     800M 。     SQL,  12 BUFFER GET :

Statistics
----------------------------------------------------------
1 recursive calls
0 db block gets
12 consistent gets
1 physical reads
0 redo size
18921 bytes sent via SQL*Net to client
558 bytes received via SQL*Net from client
8 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
99 rows processed
 
         ,     :
1、                ,             ,             。  IMP  ,          INSERT      
2、  ROWNUM<100       ,  SQL,       WHERE  ,       ,      ROWNUM<100       ,             
3、               -     ,          。  100   ,        BUFFER GET,  SQL *PLUS   ARRAY SIZE 5,               ,    20    BUFFER GET             
          ,           ,           ,    ,      ,           ,       。               。 
  

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