实例讲解sql_trace和access path的用法

来源:pcdog 作者:佚名 2008-04-07 出处:pcdog.com

access  oracle  
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    PARSING IN CURSOR #2 len=116 dep=1 uid=0 oct=3 lid=0 tim=3468993615 hv=189272129 ad='672eea30'

    select o.owner#,o.name,o.namespace,o.remoteowner,o.linkname,o.subname,o.dataobj#,o.flags from obj$ o where o.obj#=:1

    END OF STMT

    PARSE #2:c=0,e=148,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=3468993604

    BINDS #2:

    bind 0: dty=2 mxl=22(22) mal=00 scl=00 pre=00 oacflg=08 oacfl2=1 size=24 offset=0

    bfp=05f4a0cc bln=22 avl=04 flg=05

    value=31687

    EXEC #2:c=0,e=3824,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=4,tim=3469002280

    FETCH #2:c=0,e=78,p=0,cr=3,cu=0,mis=0,r=1,dep=1,og=4,tim=3469003223

    STAT #1 id=2 cnt=30536 pid=1 pos=1 obj=31687 op='TABLE ACCESS FULL T '

    =====================

    PARSING IN CURSOR #1 len=55 dep=0 uid=0 oct=42 lid=0 tim=3469005223 hv=3381932903 ad='668aba24'

    alter session set events '10046 trace name context off'

    END OF STMT

    PARSE #1:c=0,e=86,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=3469005215

    BINDS #1:

    EXEC #1:c=0,e=806,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=3469009599

    SQL> alter session set events '10046 trace name context forever,level 12';

    Session altered.

    SQL> select count(object_id) from t;

    COUNT(OBJECT_ID)

  ----------------

    30536

    SQL> alter session set events '10046 trace name context off';

    Session altered.

    *** 2006-04-21 14:00:39.000

    =====================

    PARSING IN CURSOR #1 len=68 dep=0 uid=0 oct=42 lid=0 tim=3146410393 hv=570864185 ad='668b0b0c'

    alter session set events '10046 trace name context forever,level 12'

    END OF STMT

    EXEC #1:c=0,e=25200,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=3146410376

    WAIT #1: nam='SQL*Net message to client' ela= 13714 p1=1111838976 p2=1 p3=0

    *** 2006-04-21 14:01:05.000

    WAIT #1: nam='SQL*Net message from client' ela= 25992096 p1=1111838976 p2=1 p3=0

    =====================

    PARSING IN CURSOR #1 len=30 dep=0 uid=0 oct=3 lid=0 tim=3172483520 hv=3181685953 ad='66484f6c'

    select count(object_id) from t

    END OF STMT

    PARSE #1:c=0,e=19961,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=4,tim=3172483510

    BINDS #1:

    EXEC #1:c=0,e=34883,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=4,tim=3172522525

    WAIT #1: nam='SQL*Net message to client' ela= 8 p1=1111838976 p2=1 p3=0

    WAIT #1: nam='db file scattered read' ela= 221317 p1=15 p2=10 p3=127

    WAIT #1: nam='db file scattered read' ela= 63377 p1=15 p2=137 p3=128

    WAIT #1: nam='db file scattered read' ela= 70986 p1=15 p2=265 p3=128

    WAIT #1: nam='db file scattered read' ela= 4848 p1=15 p2=393 p3=34

    FETCH #1:c=93750,e=390135,p=417,cr=420,cu=0,mis=0,r=1,dep=0,og=4,tim=3172914415

    WAIT #1: nam='SQL*Net message from client' ela= 18930 p1=1111838976 p2=1 p3=0

    FETCH #1:c=0,e=4,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=0,tim=3172936022

    WAIT #1: nam='SQL*Net message to client' ela= 4 p1=1111838976 p2=1 p3=0

    WAIT #1: nam='SQL*Net message from client' ela= 3671714 p1=1111838976 p2=1 p3=0

    STAT #1 id=1 cnt=1 pid=0 pos=1 obj=0 op='SORT AGGREGATE '

    STAT #1 id=2 cnt=30536 pid=1 pos=1 obj=31687 op='TABLE ACCESS FULL T '

    =====================



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