Create huge Waited-Session in a particular moment in Oracle 10g

Friends,
I m new in Oracle 10g database . I m working in a bank and Our production server runs in Oracle 10g in AIX server . We also running an application server with Oracle 10g database . Recently I got a strange problem in my production server .I have a schema called 'schemafe' which contains all of our users who are using the application mainly. They connect into my database via this schema .
Now recently , the users of this schema increase the "WAITED-SESSION" in our production server . And at that moment another users are hanged on . And after 10/15 minutes it becomes normal .
In this situation, can anybody plz help me to give a suggestion that how can I tune my database and remove this type of problem ? And for this situation , which things I need to tune or monitor .
Waiting for ur kind reply .. ..

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SELECT lasg.employee_number "EMPLOYEE_NUM",
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| Id | Operation                 | Name                       | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT          |                            |     1 |   303 |       | 10261 (91)| 00:02:04 |
|* 1 | FILTER                   |                            |       |       |       |            |          |
|* 2 |   HASH JOIN               |                            |     1 |   303 |       | 10179 (91)| 00:02:03 |
|* 3 |    HASH JOIN              |                            |     5 | 1060 |       | 10095 (92)| 00:02:02 |
|* 4 |     HASH JOIN             |                            | 6786 |   960K|       | 10011 (93)| 00:02:01 |
|   5 |      VIEW                 | VW_SQ_1                    | 6786 |   225K|       | 9927 (94)| 00:02:00 |
|   6 |       HASH GROUP BY       |                            | 6786 |   384K|       | 9927 (94)| 00:02:00 |
|   7 |        MERGE JOIN         |                            |    50M| 2820M|       | 1427 (53)| 00:00:18 |
|   8 |         SORT JOIN         |                            | 31937 |   998K| 2776K|   367   (2)| 00:00:05 |
|   9 |          TABLE ACCESS FULL| DATA_EMPLOY_DETAILS            | 31937 |   998K|       |    82   (2)| 00:00:01 |
|* 10 |         SORT JOIN         |                            | 31937 |   810K| 2520K|   324   (2)| 00:00:04 |
| 11 |          TABLE ACCESS FULL| DATA_EMPLOY_DETAILS        | 31937 |   810K|       |    82   (2)| 00:00:01 |
| 12 |      TABLE ACCESS FULL    | DATA_EMPLOY_DETAILS        | 31937 | 3461K|       |    83   (3)| 00:00:01 |
| 13 |     TABLE ACCESS FULL     | DATA_EMPLOY_DETAILS        | 31937 | 2089K|       |    83   (3)| 00:00:01 |
| 14 |    TABLE ACCESS FULL      | DATA_EMPLOY_DETAILS        | 31937 | 2838K|       |    83   (3)| 00:00:01 |
| 15 |   SORT AGGREGATE          |                            |     1 |    13 |       |            |          |
|* 16 |    TABLE ACCESS FULL      | DATA_EMPLOY_DETAILS        |     5 |    65 |       |    82   (2)| 00:00:01 |
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              "PANAD"."DATA_EMPLOY_DETAILS" "LASG2" WHERE "LASG2"."PERSON_ID"=:B1))
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5070 rows selected.
Statistics
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          0 db block gets
    3675913 consistent gets
    4269882 physical reads
          0 redo size
    1046781 bytes sent via SQL*Net to client
       4107 bytes received via SQL*Net from client
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I have read the links provided by both of you. Dictionary and fixed table stats are collected as a routine.
From the link given byTaral, Greg Rahn has suggested that it is a bug as below.
Its bug 9041800 and there is a 10.2.0.4 backport available as of 01/29/10.How can i get this bug fixed since there is no explanation of what need to be done? Do i need to contact oracle support for the 10.2.0.4 backport for RHEL5?
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Message was edited by:
Dion_Cho

Create huge Waited-Session in a particular moment in Oracle 10g

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