This may be a STAR schema execution plan where Oracle joins dimensions and
use Nested loop + index to join it to the fact.
Some times it's very efficient but if you do not like it I think there is a
parameter in init.ora that disables it.
Regards,
Waleed
-----Original Message-----
Sent: Wednesday, January 16, 2002 12:10 PM
To: Multiple recipients of list ORACLE-L
Hello gurus,
I have a query which seems to have a mystery cartesian join in it and I
can't seem to locate it. I would definitely appreciate some help if
possible. My view doesn't have a join associated with it and it appears
that I have the correct number of joins for the number of tables I am
selecting from. I have also recently rebuilt my indexes and analyzed all
tables. One other point is that I am joining across schemas by way of
synonyms. The si_monitor table resides in a separate schema. Hmmmm?
Here is my query:
SELECT vslfl.error_type_id error_type_id,
vslfl.interface_id,
sm.error_check,
86400 * (sysdate - sm.error_time) err_secs,
slt.warn,
slt.shortname
FROM v_si_last_faq_log vslfl,
si_monitor sm,
sm_log_type slt
WHERE vslfl.interface_id = sm.interface_id
AND vslfl.error_type_id = slt.error_type_id
AND vslfl.interface_id = 1
/
Here is the output from the tkprof:
SELECT vslfl.error_type_id error_type_id,
vslfl.interface_id,
sm.error_check,
:"SYS_B_0" * (sysdate - sm.error_time) err_secs,
slt.warn,
slt.shortname
FROM v_si_last_faq_log vslfl,
si_monitor sm,
sm_log_type slt
WHERE vslfl.interface_id = sm.interface_id
AND vslfl.error_type_id = slt.error_type_id
AND vslfl.interface_id = :"SYS_B_1"
call count cpu elapsed disk query current
rows
------- ------ -------- ---------- ---------- ---------- ----------
----------
Parse 1 0.00 0.00 0 0 0
0
Execute 1 0.00 0.00 0 0 0
0
Fetch 2 0.71 1.68 3114 3540 4
1
------- ------ -------- ---------- ---------- ---------- ----------
----------
total 4 0.71 1.68 3114 3540 4
1
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
Parsing user id: 18 (SITEMON)
Rows Row Source Operation
------- ---------------------------------------------------
1 NESTED LOOPS
2 MERGE JOIN CARTESIAN
2 VIEW V_SI_LAST_FAQ_LOG
2 SORT ORDER BY
1 TABLE ACCESS BY INDEX ROWID SI_LOG
3629 INDEX RANGE SCAN (object id 3281)
2 SORT JOIN
1 TABLE ACCESS FULL SI_MONITOR
1 TABLE ACCESS BY INDEX ROWID SM_LOG_TYPE
2 INDEX UNIQUE SCAN (object id 3318)
Rows Execution Plan
------- ---------------------------------------------------
0 SELECT STATEMENT GOAL: CHOOSE
1 NESTED LOOPS
2 MERGE JOIN (CARTESIAN)
2 VIEW OF 'V_SI_LAST_FAQ_LOG'
2 SORT (ORDER BY)
1 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'SI_LOG'
3629 INDEX GOAL: ANALYZED (RANGE SCAN) OF
'SI_LOG_INT_IDX' (NON-UNIQUE)
2 SORT (JOIN)
1 TABLE ACCESS GOAL: ANALYZED (FULL) OF 'SI_MONITOR'
1 TABLE ACCESS GOAL: ANALYZED (BY INDEX ROWID) OF
'SM_LOG_TYPE'
2 INDEX GOAL: ANALYZED (UNIQUE SCAN) OF 'SM_LOG_TYPE_PK'
(UNIQUE)
Here is the syntax from my view (v_si_last_faq_log):
SELECT error_id last_error_id,
interface_id,
error_type_id,
ewhen,
request_time
FROM si_log
WHERE last_faq_log = 'Y'
ORDER BY error_id
/
Any help would be appreciated.
Thanks in Advance
ReedK
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