Index usage making SQL slower.

Hello,
While working on a performance tuning activity on Oracle 10.2.0.4 on Solaris 10, I encountered a problem wherein one of our DBA's suggested indexing 2 columns of a certain table. One of the queries which is being run on that table has a RULE hint, and it is seen to be making use of this newly created index. Before the index was created, this query was running fine and getting completed within 30 mins or so. However after the index is created, it is now taking 12 hours on average to complete. Please note that in both the above cases, the CURSOR_SHARING parameter was set to EXACT. Yes, after the index was created its statistics were computed, and for both the index and the base table statistics were gathered. The query is making use of bind variables and is being run via the SQR engine of PeopleSoft.
Please advice what can be the possible reasons for such delays being caused?
For any information, please let me know and I would provide the same in this forum/
Note for moderators: I could not find the section for Performance tuning, so I am asking this question in the general forum. Apologies.
Thank You,
Prashant.

Index scans are not always faster.
Full table scans are not always bad.
I doubt that the RULE hint is necessary.
In general, [url http://www.centrexcc.com/Tuning%20by%20Cardinality%20Feedback.pdf]the CBO does an excellent job of finding the best access plan for a given sql provided it is able to accurately estimate the cardinalities of the row sources in the plan.
See advice and information required in the template tuning threads:
[url https://forums.oracle.com/forums/thread.jspa?threadID=863295]How to post a sql tuning request
[url https://forums.oracle.com/forums/thread.jspa?messageID=1812597]When your query takes too long

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    Launch the Activity Monitor application in any of the following ways:
    ☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
    ☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
    ☞ If you’re running OS X 10.7 or later, open LaunchPad. Click Utilities, then Activity Monitor in the page that opens.
    Select the CPU tab of the Activity Monitor window.
    Select All Processes from the menu in the toolbar, if not already selected.
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    Select the System Memory tab. What values are shown in the bottom part of the window for Page outs and Swap used?
    Step 2
    You must be logged in as an administrator to carry out this step.
    Launch the Console application in the same way as above. Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left.
    Post the 50 or so most recent messages in the log — the text, please, not a screenshot.
    Important: Some personal information, such as your name, may appear in the log. Edit it out before posting.

  • Index Usage

    Hi All,
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    (e.job='SALESMAN' and e.sal >=1500);
    SQL> set autotrace on explain
    SQL> select * from test1;
    18 rows selected.
    Execution Plan
    Plan hash value: 4192419542
    | Id  | Operation        | Name | Rows  | Bytes | Cost (%CPU)| Time       |
    |   0 | SELECT STATEMENT   |       |     1 |    67 |    10   (0)| 00:00:01 |
    |   1 |  NESTED LOOPS        |       |     1 |    67 |    10   (0)| 00:00:01 |
    |   2 |   TABLE ACCESS FULL| DEPT |     4 |    88 |     3   (0)| 00:00:01 |
    |*  3 |   TABLE ACCESS FULL| EMP  |     1 |    45 |     2   (0)| 00:00:01 |
    ---------------------------------------------------------------------------The index is not used, mostly due to a OR condition. How can we make the index use without using hints ?

    sb92075 wrote:
    post EXPLAIN PLAN for problem SQL
    Execution Plan
    Plan hash value: 3466901445
    | Id  | Operation          | Name        | Rows  | Bytes | Cost (%CPU)| Time     |
    |   0 | SELECT STATEMENT   |             |     1 |   331 |   383K  (7)| 01:16:40 |
    |*  1 |  HASH JOIN         |             |     1 |   331 |   383K  (7)| 01:16:40 |
    |*  2 |   TABLE ACCESS FULL| ENT_TRAN|     1 |   165 |   205K  (9)| 00:41:07 |
    |   3 |   TABLE ACCESS FULL| ENT_MAST         |    19M|  3111M|   177K  (3)| 00:35:31 |
    1 - access(NLSSORT("ENT_MAST"."ID",'nls_sort=''BINARY_CI''')=NLSSORT(
                  "ENT_TRAN"."RID",'nls_sort=''BINARY_CI'''))
       2 - filter(NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'''
                  )=HEXTORAW('616D616E616820736168616D206E6173696F6E616C2062657268616400')
                  AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('343
                  73435377600')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_C
                  I''')=HEXTORAW('74656E616761206E6173696F6E616C2062657268616400')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3230303
                  836367700')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'
                  '')=HEXTORAW('74656C656B6F6D206D616C61797369612062657268616400')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3132383
                  734307000')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'
                  '')=HEXTORAW('6167726F2062616E6B00')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3831313
                  831307500')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'
                  '')=HEXTORAW('6272756365206C656520796565206C616D00')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3530333
                  333373100')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'
                  '')=HEXTORAW('616B6261722074726164696E6700')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3030313
                  438383037397500')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINA
                  RY_CI''')=HEXTORAW('372D656C6576656E206D616C61797369612073646E2062686400')
                    AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3
                  132303936327000')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINA
                  RY_CI''')=HEXTORAW('6368616E20796F6B65206368656E6700')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3637303
                  532372D30362D3534393600')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sor
                  t=''BINARY_CI''')=HEXTORAW('646B7368206D616C61797369612073646E2062686400')
                    AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3
                  030343437367500')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINA
                  RY_CI''')=HEXTORAW('626574746572207B267D206265737420656E746572707269736500
                  ')  AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW(
                  '3030313632353132347000')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sor
                  t=''BINARY_CI''')=HEXTORAW('6C696D20656E672073696F65206A756E6B657400')
                  AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('743
                  5353138393300')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY
                  _CI''')=HEXTORAW('712E712E206A756E6B657400')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('7331373
                  233363200')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI'
                  '')=HEXTORAW('6572206B696D206B656F6E6700')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3539303
                  932302D31302D3538333700')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sor
                  t=''BINARY_CI''')=HEXTORAW('726963686C616E64206C6569737572652067726F757000
                  ')  AND NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW(
                  '3538303532382D30312D3539383500')  OR
                  NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI''')=HEXTORAW('74
                  69656E2079756E20656E74657270726973652073646E2E206268642E00')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3637303
                  332382D31302D3534363700')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sor
                  t=''BINARY_CI''')=HEXTORAW('73686172696B617420686F636B2068696E00')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3030303
                  234323136397000')  OR NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINA
                  RY_CI''')=HEXTORAW('6D7964696E206D6F68616D656420686F6C64696E67732062686420
                  28666F726D65726C79206B6E6F776E206173206D7964696E206D6F68616D656420686F6C64
                  696E67732073646E206268642900')  AND NLSSORT("ENT_TRAN"."PP_NO",'nls_so
                  rt=''BINARY_CI''')=HEXTORAW('3232313434386100')  OR
                  NLSSORT("ENT_TRAN"."NAME",'nls_sort=''BINARY_CI''')=HEXTORAW('65
                  7665726973652076656E74757265732073646E2062686400')  AND
                  NLSSORT("ENT_TRAN"."PP_NO",'nls_sort=''BINARY_CI''')=HEXTORAW('3239353
                  137377000')  OR NLSSORT("EN)
    Statistics
              1  recursive calls
              0  db block gets
        1353887  consistent gets
        1353339  physical reads
              0  redo size
        1204784  bytes sent via SQL*Net to client
           4989  bytes received via SQL*Net from client
            408  SQL*Net roundtrips to/from client
              0  sorts (memory)
              0  sorts (disk)
           6092  rows processed
    {code}                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

  • Index Usage in 9i changed  when used rownum

    Hi List,My Application is in RBO
    Here is one more brain twister ?
    Assume following I Have table SHRI with a single column
    COL I have created Index on COL column say IND_COL.
    Now when I run Following query on 8i with AUTOTRACE ON
    I can see that 8i Uses the Index IND_COL Clearly .
    select * from shri where (h_name='ABC' or h_name='BOM')
    or (h_name ='BOM' or h_name='MOM')
    and rownum=1
    select * from shri where (COL='ABC' or COL='BOM')
    or (COL='ABC' or COL='BOM')
    and rownum=1
    (Note:Above example is just for ur understanding plz.dont see the usage)
    Now my problem is when I see the explain plan for above query in 8i I can see that Query uses IND_COL .
    But when I run the same in 9i It does not uses IND_COL Index (Strange!!!) .
    However when I remove "and rownum=1" clause then It again uses the index in 9i.
    Assume that such queries are existing many places .
    I am badly stuck because of this problem can anybody suggest the best way (Other than changing RBO to CBO) ?
    Regards
    Sripad.

    Run below query, you will get all the details of tablespaces.
    col "Tablespace" for a22
    col "Used MB" for 99,999,999
    col "Free MB" for 99,999,999
    col "Total MB" for 99,999,999
    select df.tablespace_name "Tablespace",
    totalusedspace "Used MB",
    (df.totalspace - tu.totalusedspace) "Free MB",
    df.totalspace "Total MB",
    round(100 * ( (df.totalspace - tu.totalusedspace)/ df.totalspace))
    "Pct. Free"
    from
    (select tablespace_name,
    round(sum(bytes) / 1048576) TotalSpace
    from dba_data_files
    group by tablespace_name) df,
    (select round(sum(bytes)/(1024*1024)) totalusedspace, tablespace_name
    from dba_segments
    group by tablespace_name) tu
    where df.tablespace_name = tu.tablespace_name ;

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