Hierarchy of the mother and father

Hi guys,.

I tried to write a query to return the genalogy a set ID.

We get the following configuration:

[Code]

create the genealogy of the table

(id varchar2 (10))

m_Id varchar2 (10),

F_ID varchar2 (10)

);

create an index only id_idx on genealogy (id);

create an index only m_id_idx on genealogy (m_id);

create an index only f_id_idx on genealogy (f_id);

insert into genealogy (id, m_id f_id) values (0,1,2);

insert into genealogy (id, m_id f_id) values (1,3,4);

insert into genealogy (id, m_id f_id) values (2,5,6);

insert into genealogy (id, m_id f_id) values (3,7,8);

insert into genealogy (id, m_id f_id) values (4,9,10);

insert into genealogy (id, m_id f_id) values (5,12,12);

insert into genealogy (id, m_id f_id) values (6,14,14);

insert into genealogy (id, m_id f_id) values (7,15,16);

insert into genealogy (id, m_id f_id) values (8,17,18);

insert into genealogy (id, m_id f_id) values (9,19,20);

insert into genealogy (id, m_id f_id) values (10,21,22);

insert into genealogy (id, m_id f_id) values (11,23,24);

insert into genealogy (id, m_id f_id) values (12,25,26);

insert into genealogy (id, m_id f_id) values (13,27,28);

insert into genealogy (id, m_id f_id) values (14,29,30);

insert into genealogy (id, m_id f_id) values (15, NULl, NULL);

insert into genealogy (id, m_id f_id) values (16, NULl, NULL);

insert into genealogy (id, m_id f_id) values (17, NULl, NULL);

insert into genealogy (id, m_id f_id) values (18, NULl, NULL);

insert into genealogy (id, m_id f_id) values (19, NULl, NULL);

insert into genealogy (id, m_id f_id) values (20, NULl, NULL);

insert into genealogy (id, m_id f_id) values (21, NULl, NULL);

insert into genealogy (id, m_id f_id) values (22, NULl, NULL);

insert into genealogy (id, m_id f_id) values (23, NULl, NULL);

insert into genealogy (id, m_id f_id) values (24, NULl, NULL);

insert into genealogy (id, m_id f_id) values (25, NULl, NULL);

insert into genealogy (id, m_id f_id) values (26, NULl, NULL);

insert into genealogy (id, m_id f_id) values (27, NULl, NULL);

insert into a values (id, m_id f_id) genealogy (28, NULl, NULL);

insert into genealogy (id, m_id f_id) values (29, NULl, NULL);

insert into genealogy (id, m_id f_id) values (30, NULl, NULL);

BEGIN

FOR I IN 31.50000 LOOP

INSERT INTO genealogy (id, m_id f_id) VALUES (I, NULL, NULL);

END LOOP;

END;

BEGIN

DBMS_STATS. GATHER_TABLE_STATS (OWNNAME = > USER,)

TABNAME = > "GENEALOGY."

METHOD_OPT = > ' for all indexed columns size auto ');

END;

SELECT ID, m_id F_id, LEVEL

GENEALOGY of level where < = 4

START WITH ID = '0'

CONNECT PRIOR M_ID = ID OR

PREREQUISITE F_ID = ID

[/ code]

I want that the members of the family up to grandparents.

The problem is that the execution plan uses a full table because of the OR condition scan. If I remove it uses unique ever access to a list.

but when I add the mother and father use a lot. I guess this SQL to access the table 15 times with access to the unique index. It would be much better than a FTS.

You have any ideas?

Thank you

You experience this problem is denormalized design. You can create the table of genealogy as:

drop table genealogy serving
/
create table (genealogy)
Identification number not null,
number of P_ID,
p_type varchar2 (1) not null
)
/
change the genealogy of the table
Add constraint genealogy_pk
(primary key)
ID,
p_type
)
/
change the genealogy of the table
Add constraint genealogy_chk1
Check)
p_type in ('F', ')
)
/
create indexes genealogy_idx1
about genealogy)
P_ID
)
/
Insert in the values(0,1,'M') genealogy;
Insert in the values(1,3,'M') genealogy;
Insert in the values(2,5,'M') genealogy;
Insert in the values(3,7,'M') genealogy;
Insert in the values(4,9,'M') genealogy;
Insert in the values(5,11,'M') genealogy;
Insert in the values(6,13,'M') genealogy;
Insert in the values(7,15,'M') genealogy;
Insert in the values(8,17,'M') genealogy;
Insert in the values(9,19,'M') genealogy;
Insert in the values(10,21,'M') genealogy;
Insert in the values(11,23,'M') genealogy;
Insert in the values(12,25,'M') genealogy;
Insert in the values(13,27,'M') genealogy;
Insert in the values(14,29,'M') genealogy;

Insert into values genealogy (0.2, 'F');
Insert into values genealogy (1.4, 'F');
Insert into values genealogy (2.6, 'F');
Insert into values genealogy (3.8, 'F');
Insert in the values(4,10,'F') genealogy;
Insert in the values(5,12,'F') genealogy;
Insert in the values(6,14,'F') genealogy;
Insert in the values(7,16,'F') genealogy;
Insert in the values(8,18,'F') genealogy;
Insert in the values(9,20,'F') genealogy;
Insert into values genealogy (10.22, 'F');
Insert into values genealogy (11,24, 'F');
Insert into values genealogy (12,26, 'F');
Insert into values genealogy (13,28, 'F');
Insert into values genealogy (14,30, 'F');

Insert into genealogy values (15, 'F', NULl);
Insert into values genealogy (16, NULl, 'F');
Insert into values genealogy (17, NULl, 'F');
Insert into genealogy values (18, 'F', NULl);
Insert into values genealogy (19, NULl, 'F');
Insert into genealogy values (20, 'F', NULl);
Insert into values genealogy (21, NULl, 'F');
Insert into values genealogy (22, NULl, 'F');
Insert into values genealogy (23, NULl, 'F');
Insert into values genealogy (24, NULl, 'F');
Insert into genealogy values (25, NULl, 'F');
Insert into values genealogy (26, NULl, 'F');
Insert into values genealogy (27, NULl, 'F');
Insert into values genealogy (28, NULl, 'F');
Insert into values genealogy (29, NULl, 'F');
Insert into genealogy values (30, 'F', NULl);
Insert in the values(15,NULl,'M') genealogy;
Insert in the values(16,NULl,'M') genealogy;
Insert in the values(17,NULl,'M') genealogy;
Insert in the values(18,NULl,'M') genealogy;
Insert in the values(19,NULl,'M') genealogy;
Insert in the values(20,NULl,'M') genealogy;
Insert in the values(21,NULl,'M') genealogy;
Insert in the values(22,NULl,'M') genealogy;
Insert in the values(23,NULl,'M') genealogy;
Insert in the values(24,NULl,'M') genealogy;
Insert in the values(25,NULl,'M') genealogy;
Insert in the values(26,NULl,'M') genealogy;
Insert in the values(27,NULl,'M') genealogy;
Insert in the values(28,NULl,'M') genealogy;
Insert in the values(29,NULl,'M') genealogy;
Insert in the values(30,NULl,'M') genealogy;
Commit
/
explain plan
for
Select eff.*,
level
Genealogy g
Start with id = 0
connection by p_id = prior id
and level<=>
/
Select *.
table (dbms_xplan.display)
/

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------
Hash value of plan: 2815987643

-----------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-----------------------------------------------------------------------------------------------
|   0 | SELECT STATEMENT |              |     6.   324.     6 (34) | 00:00:01 |
|* 1 | CONNECT BY WITH FILTERING |              |       |       |            |          |
|   2.   TABLE ACCESS BY INDEX ROWID | GENEALOGY |     2.    56.     1 (0) | 00:00:01 |
|* 3 |    INDEX RANGE SCAN | GENEALOGY_PK |     2.       |     1 (0) | 00:00:01 |
|* 4 |   FILTER                       |              |       |       |            |          |
|   5.    NESTED LOOPS |              |     4.   164.     3 (0) | 00:00:01 |

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------
|   6.     CONNECT PUMP |              |       |       |            |          |
|   7.     TABLE ACCESS BY INDEX ROWID | GENEALOGY |     2.    56.     1 (0) | 00:00:01 |
|* 8 |      INDEX RANGE SCAN | GENEALOGY_PK |     2.       |     1 (0) | 00:00:01 |
-----------------------------------------------------------------------------------------------

Information of predicates (identified by the operation identity card):
---------------------------------------------------

1 - access ("ID" = "P_ID" PRIOR)
filter (LEVEL<>
3 - access ("ID" = 0)

PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------
4 filter (LEVEL<>
8 - access("ID"="connect$_by$_pump$_002"."p_id préalable «)

Note
-----
-dynamic sample used for this survey (level = 2)

28 selected lines.

SQL >

SY.

Tags: Database

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