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  • OWI之direct path read

    <pre name="code" class="sql"> select sid,event,p1,p2,p3 from v$session_wait where sid=9;
           SID        event                 p1      p2      p3
     1	9	direct path read	13	1535744	128
    
    p1 要读取的绝对文件号
    
    p2 读取的起始块号
    
    p3 要读的块数
    
    SQL> select * from v$mystat where rownum<2;
    
           SID STATISTIC#	   VALUE
    ---------- ---------- ----------
          1427	    0	       0
    
    SQL> select count(*) from F_AGT_COMR_INTDIST_H;
    
    
    SQL> select sid,event,p1,p2,p3 from v$session_wait where sid=1427;
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    18	   907780	 124
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    29	   920324	 124
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    24	  1141376	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    19	   426884	 124
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    12	  1010945	 127
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    44	    87296	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    26	   420356	 124
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    22	   857856	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    16	  1462016	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    14	   972288	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    10	   864130	 126
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							     7	   991880	 120
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							     7	   997632	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							     5	  1409024	 128
    
    SQL> /
    
           SID EVENT								    P1	       P2	  P3
    ---------- ---------------------------------------------------------------- ---------- ---------- ----------
          1427 direct path read							    51	   747648	 128
    
    
    正常情况下P3值约等于多块读的块数
    


    
                                        
    
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  • 原文地址:https://www.cnblogs.com/hzcya1995/p/13352184.html
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