Oracle-L: Re: how to know ,the tables which are accessed via FTS?

From: Alex Feinstein <alexf1_at_san.rr.com>
Date: Mon, 11 Mar 2002 21:58:18 -0800
Message-ID: <F001.0042528F.20020311215818@fatcity.com>

Gopal, Ganesh, ...

Small correction:

1. v$session_event does not have file#, block# and blocks. They are in v$session_wait, which may be hard to catch.
2. Absolute best methode. But field name is "flag". not "class", you can use bitand(flag,power(2,19) > 0 as a condition. When join to dba_objects(user_objects) one should use field data_object_id, not object_id. Take care about clusters, as all object in cluster share the same data_object_id. Anothe (but slower) way is join with dba_extents(user_extents).
4. This give accurate info to the file level, not segment level.

Alex.

Original Message ----- From: K Gopalakrishnan To: Multiple recipients of list ORACLE-L Sent: Monday, March 11, 2002 11:07 AM Subject: RE: how to know ,the tables which are accessed via FTS?

Ganesh,

You can find FTS in the following methods:

THe existence of the 'db file scattered read' in the V$session_event. From this we can find the file#, Block# and #of Blocks. Using this info we can get the segment name from the dictionary.
ANy block read using Sequential Scan (Full Table Scan) will be flagged as 0x80000 in the X$BH.CLASS. So existence of i0x80000 in X$.BH tells there is an FTS in the buffer cache. So from X$BH we can get the object name from the user_object by joining X$.BH.OBJ
THen the normal SQL Trace with TKPROF
If the KCFIOPBR>KCFIOPYRin the X$KCFIO (exposed as V$FILESTAT as PHYSICAL READS and PHYSICAL BLOCK READS) then some of the segments in that datafile is read by FTS. (THis may not give 100% accurate info) 5.. Any other thoughts?

  Best Regards,
  K Gopalakrishnan
  Bangalore, INDIA

    -----Original Message-----
    From: Ganesh Raja [mailto:ganesh_at_gtfs-gulf.com]     Sent: Monday, March 11, 2002 1:12 AM     To: LazyDBA.com Discussion
    Subject: RE: how to know ,the tables which are accessed via FTS?

What will that Acheive... this will not give u Tables that have FTS Done on them.

    Best Regards,
    Ganesh R
    Tel : +971 (4) 397 3337 Ext 420
    Fax : +971 (4) 397 6262
    HP : +971 (50) 7456019

      -----Original Message-----
      From: vipin jain [mailto:vipin.jain_at_tatainfotech.com]
      Sent: Monday, March 11, 2002 1:02 PM
      To: LazyDBA.com Discussion
      Subject: Re: how to know ,the tables which are accessed via FTS?


      USE analyze table with compute statistcs....
      Thanks and regards,
      Vipin Jain
      ----- Original Message ----- 
        From: Atul Gupta 
        To: LazyDBA.com Discussion 
        Sent: Monday, March 11, 2002 2:20 PM
        Subject: how to know ,the tables which are accessed via FTS?


        Hi Gurus  ,

          One little question 
        how will i get to know what all tables are accessed via full table scan ?

        any help will be highly appreciated 


        Thnax in advance
        Atul Gupta

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Author: Alex Feinstein
INET: alexf1_at_san.rr.com

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