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pour avoir le sujet.

TD02 : 

Création des tables : 


create table film (
	id_film	number(4) PRIMARY KEY,
	titre varchar(255),
	annee number(6),
	id_realisateur varchar(255)
)
	TABLESPACE USERS;

create table seance (
	id_seance number(4) PRIMARY KEY,
	heuredebut number(4),
	heurefin number(4),
	id_salle number(4),
	id_film number(4)

create table cinema (
	id_cinema number(4) PRIMARY KEY,
	nom varchar(255),
	adresse varchar(255)
)
	TABLESPACE USERS;

create table salle (
	id_salle number(4) PRIMARY KEY,
	nom varchar(255),
	capacite number(3),
	id_cinema number(4)
)
	TABLESPACE USERS;

ALTER TABLE salle 
	ADD CONSTRAINT f_id_cinema FOREIGN KEY (id_cinema) REFERENCES cinema(id_cinema);

)

ALTER TABLE seance
	ADD CONSTRAINT f_id_salle FOREIGN KEY (id_salle) REFERENCES salle(id_salle);

ALTER TABLE seance
	ADD CONSTRAINT f_id_film FOREIGN KEY (id_film) REFERENCES film(id_film);


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AIDE AIDE AIDE AIDE AIDE 

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create table PLAN_TABLE (
	statement_id	varchar2(30),
	timestamp        date,
	remarks varchar2(80),
	operation       varchar2(30),
	options         varchar2(30),
	object_node     varchar2(128),
	object_owner    varchar2(30),
	object_name     varchar2(30),
	object_instance numeric,
	object_type     varchar2(30),
	optimizer       varchar2(255),
	search_columns  number,
	id	numeric,
	parent_id       numeric,
	position        numeric,
	cost            numeric,
	cardinality     numeric,
	bytes           numeric,
	other_tag       varchar2(255),
	partition_start varchar2(255),
	partition_stop  varchar2(255),
	partition_id    numeric,
	other           long,
	distribution    varchar2(30))
tablespace USERS
;

----------------------------------------------------------------------------

set linesize 255
set wrap on
col acces for a20
col object_name for a10
select id, lpad(' ',parent_id+1)||operation acces,options,object_name,parent_id,position
from plan_table where statement_id ='MonPremierEssai';

----------------------------------------------------------------------------
 ensuite taper la commande suivante : 

explain plan
set statement_id ='MonPremierEssai'
for
select * from cinema where nom='Le rex'
;

Pour finalement vérifier le contenu ainsi générer : 

select operation,options,object_name,id,parent_id,position
from plan_table
where statement_id='MonPremierEssai' order by id
;

CE QUI DONNE : 

OPERATION                      OPTIONS                        OBJECT_NAME                            ID  PARENT_ID   POSITION
------------------------------ ------------------------------ ------------------------------ ---------- ---------- ----------
SELECT STATEMENT                                                                                      0
TABLE ACCESS                   FULL                           CINEMA                                  1          0          1


¤ Pour question 2 on a : 

explain plan
set statement_id ='MonSecondEssai'
for
SELECT * FROM cinema WHERE id_cinema=1908;

set linesize 255
set wrap on
col acces for a20
col object_name for a10
select id, lpad(' ',parent_id+1)||operation acces,options,object_name,parent_id,position
from plan_table where statement_id ='MonSecondEssai';

¤ Ce qui donne : 

        ID ACCES                OPTIONS                        OBJECT_NAM  PARENT_ID   POSITION
---------- -------------------- ------------------------------ ---------- ---------- ----------
         0 SELECT STATEMENT
         1  TABLE ACCESS        BY INDEX ROWID                 CINEMA              0          1
         2   INDEX              UNIQUE SCAN                    SYS_C00243          1          1
                                                               9

¤ Pour les jointures on a  :

explain plan
set statement_id ='MonTroisiemeEssai'
for
SELECT cinema.nom, capacite 
FROM cinema, salle WHERE cinema.id_cinema=salle.id_cinema;

set linesize 255
set wrap on
col acces for a20
col object_name for a10
select id, lpad(' ',parent_id+1)||operation acces,options,object_name,parent_id,position
from plan_table where statement_id ='MonTroisiemeEssai';

¤ Ce qui donne : 

        ID ACCES                OPTIONS                        OBJECT_NAM  PARENT_ID   POSITION
---------- -------------------- ------------------------------ ---------- ---------- ----------
         0 SELECT STATEMENT
         1  NESTED LOOPS                                                           0          1
         2   TABLE ACCESS       FULL                           SALLE               1          1
         3   TABLE ACCESS       BY INDEX ROWID                 CINEMA              1          2
         4     INDEX            UNIQUE SCAN                    SYS_C00243          3          1
                                                               9