Execution Plan Not available

Question

Dear All,
One of my databases not able to view the explain plan. pl help me to resolve this....
Databaes Version 9.2.0.8 windows
13:49:53 SYS@devdb>set autot trace exp stat;
13:19:28 SYS@devdb>select sid from v$session where sid=(select sid from v$mystat where rownum =1);
1 row selected.
Elapsed: 00:00:00.01
Execution Plan
Statistics
0 recursive calls
0 db block gets
0 consistent gets
0 physical reads
0 redo size
374 bytes sent via SQL*Net to client
368 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
13:50:29 SYS@devdb>
Edited by: Abk on Nov 10, 2010 1:53 PM
Edited by: Abk on Nov 10, 2010 2:01 PM

Answer 1

Thanks Mustafa for your reply,
14:16:27 SYS@devdb>explain plan for select sid from v$session where sid=(select sid from v$mystat where rownum =1);
Explained.
Elapsed: 00:00:00.00
14:18:08 SYS@devdb>
14:18:08 SYS@devdb>
14:18:08 SYS@devdb>select * from Table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
| Id | Operation | Name | Rows | Bytes | Cost |
| 0 | SELECT STATEMENT | | | | |
|* 1 | FILTER | | | | |
|* 2 | FIXED TABLE FULL | X$KSUSE | | | |
|* 3 | COUNT STOPKEY | | | | |
|* 4 | FILTER | | | | |
|* 5 | FIXED TABLE FULL | X$KSUMYSTA | | | |
| 6 | FIXED TABLE FULL | X$KSUSGIF | | | |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
1 - filter("X$KSUSE"."INDX"= (SELECT /*+ */
"X$KSUMYSTA"."KSUSENUM" FROM "X$KSUMYSTA" "X$KSUMYSTA" WHERE
"X$KSUMYSTA"."KSUSESTN"< (SELECT "X$KSUSGIF"."KSUSGSTL" FROM
"X$KSUSGIF" "X$KSUSGIF") AND ROWNUM=1 AND
BITAND("X$KSUMYSTA"."KSUSEFLG",1)<>0 AND
BITAND("X$KSUMYSTA"."KSSPAFLG",1)<>0 AND
PLAN_TABLE_OUTPUT
"X$KSUMYSTA"."INST_ID"=:B1))
2 - filter(BITAND("X$KSUSE"."KSUSEFLG",1)<>0 AND
BITAND("X$KSUSE"."KSSPAFLG",1)<>0 AND "X$KSUSE"."INST_ID"=:B1)
3 - filter(ROWNUM=1)
4 - filter("X$KSUMYSTA"."KSUSESTN"< (SELECT
"X$KSUSGIF"."KSUSGSTL" FROM "X$KSUSGIF" "X$KSUSGIF"))
5 - filter(BITAND("X$KSUMYSTA"."KSUSEFLG",1)<>0 AND
BITAND("X$KSUMYSTA"."KSSPAFLG",1)<>0 AND "X$KSUMYSTA"."INST_ID"=:B1)
Note: rule based optimization
32 rows selected.