Cartesian Product in Select

Question

    Hi all!
I need help.
I have this function that launches a Select. My Oracle Grid tells me, when I tune the Select of this function, that there is a Cartesian Product. I understand what a Cartesian Product is, but I fail to find it. Can you help me by pointing out WHERE is the misteke? Thank you!!
P.s. Oracle EE 10.2.0.4 on windows Server 2003 R2 SP2 64Bit
[code]
create or replace
FUNCTION          "ANA_GETVERBALE"
  v_VerbaleId      IN NUMBER DEFAULT NULL,
  v_Sezione        IN VARCHAR2 DEFAULT NULL,
  v_NumeroVerbale  IN VARCHAR2 DEFAULT NULL,
  v_DataVerbale    IN DATE DEFAULT NULL,
  v_TargaVeicolo   IN VARCHAR2 DEFAULT NULL,
  v_Serie          IN VARCHAR2 DEFAULT NULL,
  v_LoggedUser IN VARCHAR2 DEFAULT NULL
RETURN SYS_REFCURSOR
AS
   cv_1 SYS_REFCURSOR;
BEGIN
  OPEN cv_1 FOR
    SELECT
      ANA_M.VerbaleId,
      ANA_M.Sezione,
      ANA_M.NumeroVerbale,
      ANA_M.DataVerbale,
      ANA_M.TargaVeicolo,
      ANA_M.Serie,
      SCH_C.StatoCartellinoId,
      LOV_StatoCartellino.ListOfValueName StatoCartellino,
      sch_c.cartellinoid
    FROM ANA_Materia_Verbale ANA_M
    INNER JOIN SCH_Cartellini SCH_C ON SCH_C.SoggettoId=ana_m.verbaleid AND SCH_C.TipoSoggettoId = SIS_CONSTANTS_PKG.VB
    INNER JOIN SIC_PROFILO_STATO SIC_PSC ON SIC_PSC.STATOID=SCH_C.STATOCARTELLINOID
    INNER JOIN SIC_PROFILI_USERS SIC_PUC ON SIC_PUC.PROFILOID=SIC_PSC.PROFILOID AND SIC_PUC.PERSONALID=v_LoggedUser
    LEFT JOIN TYP_ListOfValues LOV_StatoCartellino  ON LOV_StatoCartellino.ListOfValueId = SCH_C.StatoCartellinoId
    WHERE ( v_VerbaleId = SIS_CONSTANTS_PKG.AnyBigint OR ANA_M.VerbaleId = v_VerbaleId )
      AND ( v_Sezione = SIS_CONSTANTS_PKG.AnyString OR REGEXP_LIKE(ANA_M.Sezione, '^' || v_Sezione || '$', 'i') )
      AND ( v_serie = SIS_CONSTANTS_PKG.AnyString OR REGEXP_LIKE(ANA_M.Serie, '^' || v_Serie || '$', 'i') )
      AND ( v_NumeroVerbale = SIS_CONSTANTS_PKG.AnyString OR ANA_M.NumeroVerbale = v_NumeroVerbale )
      AND ( v_DataVerbale = SIS_CONSTANTS_PKG.AnyDateTime OR ANA_M.DataVerbale = v_DataVerbale )
      AND ( v_TargaVeicolo = SIS_CONSTANTS_PKG.AnyString OR REGEXP_LIKE(ANA_M.TargaVeicolo,'^' || v_TargaVeicolo || '$', 'i') );
  RETURN cv_1;
END;
[/code]

Answer 1

....ouch... well that explains a LOT!! The real problem was the Oracle Grid SQL_TUNING that warned me that the SELECT contained a CARTESIAN PRODUCT:
Ristruttura SQL
An expensive cartesian product operation was found at line ID 4 of the execution plan.
Consider removing the disconnected table or view from this statement or add a join condition which refers to it.
A cartesian product should be avoided whenever possible because it is an expensive operation and might produce a large amount of data.
with this EXECUTION PLAN:
Operazione
ID riga
Oggetto
Object type
Ordine
Righe
Dimensione (KB)
Costo
Tempo (sec)
Costo CPU
Costo I/O
SELECT STATEMENT
0
13
1
0,091
460
6
116.852.560
452
NESTED LOOPS OUTER
1
12
1
0,091
460
6
116.852.560
452
NESTED LOOPS
2
9
1
0,079
459
6
116.843.328
451
NESTED LOOPS
3
7
2
0,141
457
6
116.826.984
449
MERGE JOIN CARTESIAN
4
4
2
0,102
451
6
116.781.136
443
INDEX FAST FULL SCAN
5
DOCARK.PK_SIC_PROFILI_USERS
INDEX (UNIQUE)
1
1
0,010
2
1
81.903
2
BUFFER SORT
6
3
2
0,082
449
6
116.699.232
441
TABLE ACCESS FULL
7
DOCARK.ANA_MATERIA_VERBALE
TABLE
2
2
0,082
449
6
116.699.232
441
TABLE ACCESS BY INDEX ROWID
8
DOCARK.SCH_CARTELLINI
TABLE
6
1
0,020
3
1
22.924
3
INDEX RANGE SCAN
9
DOCARK.IDX_SCH_CARTELLINI_SOG_TIPO
INDEX
5
1
2
1
15.493
2
INDEX RANGE SCAN
10
DOCARK.PK_SIC_PROFILO_STATO
INDEX (UNIQUE)
8
1
0,009
1
1
8.171
1
TABLE ACCESS BY INDEX ROWID
11
DOCARK.TYP_LISTOFVALUES
TABLE
11
1
0,012
1
1
9.231
1
INDEX UNIQUE SCAN
12
DOCARK.PK_TYP_LISTOFVALUES
INDEX (UNIQUE)
10
1
0
1
1.900
0
So I started trying to REMOVE the Cartesian Product. But first I had to find it! So apparently I shouldn't worry too much...
The real problem is that I have to work with funtions and DBs created by others, so I am not sure what to expect from most of the Functions. Apparently this execution is correct no matter what that the Tunig Advisor says!
Thanks!