в 13:45, 26 мая 2010

2010-05-26T13:45:46Z

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2010-05-26T10:08:45Z

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== alter MATERIALIZED VIEW dept20_mv enable query rewrite==



<source lang="sql">
SQL>
SQL> create table employees(
2 empno NUMBER(4)
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , msal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10);
1 row created.
SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10);
1 row created.
SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20);
1 row created.
SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20);
1 row created.
SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30);
1 row created.
SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30);
1 row created.
SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40);
1 row created.
SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20);
1 row created.
SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30);
1 row created.
SQL>
SQL> create MATERIALIZED VIEW dept20_mv as
2 select * from employees where deptno = 20;
select * from employees where deptno = 20
*
ERROR at line 2:
ORA-12014: table "EMPLOYEES" does not contain a primary key constraint

SQL>
SQL> alter MATERIALIZED VIEW dept20_mv enable query rewrite;
alter MATERIALIZED VIEW dept20_mv enable query rewrite
*
ERROR at line 1:
ORA-12003: materialized view "sqle"."DEPT20_MV" does not exist

SQL>
SQL> set autotrace on explain
SQL>
SQL> select *
2 from employees
3 where deptno = 20
4 and job = "TRAINER";
no rows selected

Execution Plan
----------------------------------------------------------
Plan hash value: 1445457117
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 90 | 2 (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| EMPLOYEES | 1 | 90 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("DEPTNO"=20 AND "JOB"="TRAINER")
Note
-----
- dynamic sampling used for this statement
SQL>
SQL> explain plan for
2 select * from employees
3 where deptno = 20 and job = "TRAINER";
Explained.
SQL>
SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------
Plan hash value: 1445457117
-------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
-------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 90 | 2 (0)| 00:00:01 |
|* 1 | TABLE ACCESS FULL| EMPLOYEES | 1 | 90 | 2 (0)| 00:00:01 |
-------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
1 - filter("DEPTNO"=20 AND "JOB"="TRAINER")
Note
-----
- dynamic sampling used for this statement
17 rows selected.

Execution Plan
----------------------------------------------------------
Plan hash value: 2137789089
--------------------------------------------------------------------------------
-------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU
)| Time |
--------------------------------------------------------------------------------
-------------
| 0 | SELECT STATEMENT | | 8168 | 16336 | 29 (0
)| 00:00:01 |
| 1 | COLLECTION ITERATOR PICKLER FETCH| DISPLAY | | |
| |
--------------------------------------------------------------------------------
-------------

SQL>
SQL> set autotrace off
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL></source>

== Create materialized view==



<source lang="sql">
SQL>
SQL>
SQL> create table employees(
2 empno NUMBER(4)
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , msal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10);
1 row created.
SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10);
1 row created.
SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20);
1 row created.
SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20);
1 row created.
SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30);
1 row created.
SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30);
1 row created.
SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40);
1 row created.
SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20);
1 row created.
SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30);
1 row created.
SQL>
SQL>
SQL> create or replace VIEW dept20_v as
2 select * from employees where deptno = 20;
View created.
SQL>
SQL> create TABLE dept20_t as
2 select * from employees where deptno = 20;
Table created.
SQL>
SQL> create MATERIALIZED VIEW dept20_mv as
2 select * from employees where deptno = 20;
select * from employees where deptno = 20
*
ERROR at line 2:
ORA-12014: table "EMPLOYEES" does not contain a primary key constraint

SQL>
SQL>
SQL> drop table dept20_t;
Table dropped.
SQL> drop materialized view dept20_mv;
drop materialized view dept20_mv
*
ERROR at line 1:
ORA-12003: materialized view "sqle"."DEPT20_MV" does not exist

SQL>
SQL> drop table employees;
Table dropped.
SQL></source>

== drop materialized view==



<source lang="sql">
SQL>
SQL>
SQL> create table employees(
2 empno NUMBER(4)
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , msal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason", "N", "TRAINER", 2, date "1965-12-18", 800 , NULL, 10);
1 row created.
SQL> insert into employees values(2,"Jerry", "J", "SALESREP",3, date "1966-11-19", 1600, 300, 10);
1 row created.
SQL> insert into employees values(3,"Jord", "T" , "SALESREP",4, date "1967-10-21", 1700, 500, 20);
1 row created.
SQL> insert into employees values(4,"Mary", "J", "MANAGER", 5, date "1968-09-22", 1800, NULL, 20);
1 row created.
SQL> insert into employees values(5,"Joe", "P", "SALESREP",6, date "1969-08-23", 1900, 1400, 30);
1 row created.
SQL> insert into employees values(6,"Black", "R", "MANAGER", 7, date "1970-07-24", 2000, NULL, 30);
1 row created.
SQL> insert into employees values(7,"Red", "A", "MANAGER", 8, date "1971-06-25", 2100, NULL, 40);
1 row created.
SQL> insert into employees values(8,"White", "S", "TRAINER", 9, date "1972-05-26", 2200, NULL, 40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C", "DIRECTOR",10, date "1973-04-27", 2300, NULL, 20);
1 row created.
SQL> insert into employees values(10,"Pink", "J", "SALESREP",null,date "1974-03-28", 2400, 0, 30);
1 row created.
SQL>
SQL>
SQL> create or replace VIEW dept20_v as
2 select * from employees where deptno = 20;
View created.
SQL>
SQL> create TABLE dept20_t as
2 select * from employees where deptno = 20;
Table created.
SQL>
SQL> create MATERIALIZED VIEW dept20_mv as
2 select * from employees where deptno = 20;
select * from employees where deptno = 20
*
ERROR at line 2:
ORA-12014: table "EMPLOYEES" does not contain a primary key constraint

SQL>
SQL>
SQL> drop table dept20_t;
Table dropped.
SQL> drop materialized view dept20_mv;
drop materialized view dept20_mv
*
ERROR at line 1:
ORA-12003: materialized view "sqle"."DEPT20_MV" does not exist

SQL>
SQL> drop table employees;
Table dropped.
SQL></source>

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Oracle PL/SQL Tutorial/View/Materialized View - История изменений

в 13:45, 26 мая 2010

Admin: 1 версия