Query on materialized views

Hello

Could someone of you please confirm that we always demand a Materialized View Log on the tables at the Master site to REFRESH QUICKLY in work on the materialized view.

If we do not have a log of materialized view, materialized view, always do a COMPLETE REFRESH.

Thank you
Chanjal

http://download.Oracle.com/docs/CD/E11882_01/server.112/e10713/schemaob.htm#CNCPT411

Tags: Database

Similar Questions

How to get the text of the materialized view?
Hello

How to get test (query) of materialized view?

Thank you
With
the value of 10000 long
set pages 0
DBMS_METADATA. GET_DDL ('MATERIALIZED_VIEW', 'MV_EMP', 'SCOTT');

Of course replace view_name and owner.

Elapsed time for the materialized view vs Master table query
Hello all;

Small confusion about time up for the vs Master materialized view table query

SQL > select count (*), sum (quan_sold), sum (amt_sold) of the sale;
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:30.54

SQL > create materialized view mv1
2 activate the rewrite of the query as
3. select count (*), sum (quan_sold), sum (amt_sold) of the sale;
Materialized view created.
Elapsed time: 00:00:01.45

SQL > select count (*), sum (quan_sold), sum (amt_sold) of the sale;
COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:00.01

Please see the three cases "Elapsed Time"...

When comparing other cases.
1. my query takes long time (30.54), extraction of data from the sale
2. create a materialized view takes less time (01:45) why?

Source: http://uhesse.com/2009/07/08/brief-introduction-into-materialized-views/
>
Small confusion about elapsed time for the materialized view vs Master table query

SQL > select count (*), sum (quan_sold), sum (amt_sold) from the sale.

COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:30.54

SQL > create materialized view mv1
2 activate the rewrite of the query as
3. select count (*), sum (quan_sold), sum (amt_sold) of the sale;
Materialized view created.
Elapsed time: 00:00:01.45

SQL > select count (*), sum (quan_sold), sum (amt_sold) from the sale.

COUNT (*) SUM (QUAN_SOLD) SUM (AMT_SOLD)
6000000 12000000 720480000
Elapsed time: 00:00:00.01

Please see the three cases "Elapsed Time"...

When comparing other cases.
1. my query takes long time (30.54), extraction of data from the sale
2. create a materialized view takes less time (01:45) why?
>
Many queries take less time the second time you run them. After the first performance, there may be many, if not all, lines in the buffer cache. Then the second round will not make any or all e/s physical but will obtain data from the buffer cache.

Also, you haven't checked that the MV was even used for the second run.

Drop the MV and make the query several times and means of the time. Then create the MV and do the same thing.

the materialized view query
Hello

I had created a materialized view, it refreshes every 3 minutes. At the end of 3 minutes next time we are accessing the old records of materialized view should be deleted. Can someone help me with this query...
```
create or replace materialized view deptd_mvu
     refresh fast on commit
     start with sysdate
     next sysdate + 3/(60*24)
     as select *
        from deptd;
```
969052 wrote:
No, my query shows all data are there is no error in my query? can u help me

# It is not a mistake on your part of the implementation or Oracle. Error lies in understanding.

Materialized view appeared in SELECT * FROM DEPT; So, it must take all the data that are available in the Dept table each time it is regenerated.

What you intend to do is force the MView to choose the data "Modified" of table DEPT. Is not possible, unless you have some distinctive sign that the MView should be checked.

For Eg :-(just an idea that I did not test this)

Adding another column to identify records updated the: -.
```
alter table dept add is_modified varchar2(1) default 'N';
```
MView create instruction me altered as
```
select *
  from dept
where is_modified = 'Y';
```
Write a trigger that sets the column IS_MODIFIED 'Y', each time that a record is inserted or updated. Don't worry about the deleted records (if this isn't a Soft Delete) as MView does not see records that are not present in the master table.

You simply need to ensure that, whenever the MView is refreshed, the IS_MODIFIED the Department table must be set to 'n', so that it does not display a false positives.

No rewrite of materialized view query

Hello world

I have a strange situation where I can't activate on a materialized view query rewriting, I try to create. I have all the privileges granted to me. I think I followed all the online instructions I found supportive query about rewrite, then someone could point out (I feel like it should be obvious) why I can't use the rewrite of the query?

SQL> select * from v$version
  2  /

BANNER
--------------------------------------------------------------------------------

Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

SQL> ALTER SYSTEM SET QUERY_REWRITE_ENABLED = TRUE;

System altered.

SQL> ALTER SYSTEM SET QUERY_REWRITE_INTEGRITY = STALE_TOLERATED;

System altered.

SQL> ALTER SYSTEM SET OPTIMIZER_MODE = ALL_ROWS;

System altered.

SQL> desc cef_record
 Name                                      Null?    Type
 ----------------------------------------- -------- -------------

 ID                                        NOT NULL NUMBER(38)
 EVENT_ID                                  NOT NULL NUMBER(38)
 CEF_DATE                                           VARCHAR2(20)
 HOST_NAME                                          VARCHAR2(25)
 CEF_VERSION                                        VARCHAR2(10)
 DEVICE_VENDOR                                      VARCHAR2(75)
 DEVICE_PRODUCT                                     VARCHAR2(75)
 DEVICE_VERSION                                     VARCHAR2(75)
 SIGNATURE_ID                                       VARCHAR2(75)
 CEF_NAME                                           VARCHAR2(700)
 SEVERITY                                           VARCHAR2(25)
 CEF_DATE_VIRTUAL                                   DATE

SQL> CREATE MATERIALIZED VIEW distinct_vendors_mv
  2  BUILD IMMEDIATE
  3  REFRESH ON DEMAND
  4  ENABLE QUERY REWRITE
  5  AS
  6  SELECT distinct device_vendor FROM cef_record;
SELECT distinct device_vendor FROM cef_record
                                   *
ERROR at line 6:
ORA-30353: expression not supported for query rewrite

Thanks in advance,
Alex

user9022475 wrote:
So, I thought about it. CEF_DATE_VIRTUAL is a virtual column. I tried to drop it and the CREATE MATERIALIZED VIEW statement worked. Why? I do not know. The virtual column was not involved at all in my materialized view, but I guess you can't create materialized views on tables with virtual columns?

Ahh OK. I have it.
Column virtual itself is not a problem, but its definition is the question.
You have defined a virtual column as
TO_DATE ("CEF_DATE", "MON ' JJ HH24:MI:SS")
This format makes the function as non-deterministic and violates the restrictions for the query rewriting.
If you can change the format of TO_DATE ("CEF_DATE", "MY DD YYYY HH24:MI:SS'"), it will work.

No rows returned when you query my materialized during the refresh view
Hello guys,.

I created a materialized view. When do a FORCE refresh ON DEMAND on this point of view, the query:
```
SELECT * from XX_INV_MV 
```
returns no rows.

That's why users need to access some data when they question the MV, the 'old' for example (data just before the update).
So is it possible that we can access old records of MV during the update?

Thank you.
Hello
In 9i, if you do a single mview refresh, it will be always truncated and insert, regardless of automic_refresh. If you do a refresh of the group he will do a delete and insert there in now consisting of. This behavior has changed in 10g where you will need to give automic_refresh = false if you want to truncate and insert.
I refer to metalink Note: 553464.1 more about this. Thank you.

Kind regards
Satheesh Babu S
http://satheeshbabus.blogspot.com

Published by: [email protected] on January 6, 2009 19:37
corrected typo error

materialized view ora-00907, although sql query works well
Hello

It seems to be a bug with db oracle 10.2.0.1 and his prod. env, I can't apply the patch quickly, can anyone give me a tip

CREATE THE MV_TEN MATERIALIZED VIEW
BUILDING THE INDEX REFRESH IMMEDIATE TO COMPLETE ON DEMAND HELP
AS
SELECT ten.tcy_refno AS TENANCY_REF,
Rev.rac_accno AS REV_ACC_NO,
Rev.rac_last_aba_date AS LAST_ABA_DATE,
Rev.rac_last_aba_balance AS LAST_ABA_BALANCE,
AAA.aca_status AS ARREARS_STATUS,
AAA.aca_ara_code AS ARREARS_ACTION_CODE,
AAA.aca_effective_date AS EFFECTIVE_DATE,
AAA.aca_balance AS ACCOUNT_BALANCE,
ARA.ara_description AS ARREARS_DESCRIPTION,
NPA.nop_text
OF REVENUE@remotedb rev.
Ten TENANCT@remotedb.
ACCOUNT_ARREARS_ACTIONS@remotedb aaa
LEFT OUTER JOIN ARREARS_ACTIONS@remotedb ara
ON aaa.aca_ara_code = ara.ara_code
LEFT OUTER JOIN NOTEPADS@remotedb IR
ON aaa.aca_reusable_refno = npa.nop_reusable_refno
WHERE ten.tcy_refno = rev.rac_tcy_refno
AND rev.rac_end_date IS NULL
AND rev.rac_accno = aaa.aca_rac_accno
AND aaa.aca_status! = "DEL".
AND npa.nop_current_ind = 'Y ';

ORA-00907: missing just paraenthesis

Thank you
See

http://asktom.Oracle.com/pls/asktom/f?p=100:11:4226402560732847:P11_QUESTION_ID:6585774577187

Materialized views Refresh method and refresh option

Hi Experts,

According to the docs, If the MV contains the following, MV is considered complex. I wonder is there any view data dictionary that indicates the type of MV? Because is very easy to the candidate a complex type mv. Because many queries contains the properties below.

http://docs.Oracle.com/CD/B28359_01/server.111/b28326/repmview.htm#i52501

http://docs.Oracle.com/CD/B28359_01/server.111/b28313/basicmv.htm

Specifically, a materialized view is considered complex if the materialized view definition query contains:

A CONNECT BY clause

An INTERSECT , MINUS , or UNION ALL operation

he DISTINCT or UNIQUE keyword

In some cases, an aggregate function, although it is possible to have an aggregation function in the query definition and always have a simple materialized view

In some cases, joins other than those in a subquery, although it is possible to have joins in the definition to interrogate and still have a simple materialized view

In some cases, a UNION operation

After that I kept going to read that I learned that when a VM is created, the refresh mode is specified according to the type of the MV. That means, using ON-DEMAND refresh mode is widespread. The documentation mentions that there isa also refresh option. My question is, is it possible to specify

ON REQUEST and FAST together?

Also, what are the differences between FULL and FAST. Ends truncate the table and fill it up again?

ON COMMIT

Refresh product automatically when a transaction which changed one of the paintings of the materialized view's retail is committed. This can be specified as the materialized view is quickly updatable (in other words, not complex). The ON COMMIT privilege is required to use this mode.

ON DEMAND

Refresh occurs when a user manually executes one of the procedures available refresh contained in the DBMS_MVIEW package ( REFRESH , REFRESH_ALL_MVIEWS , REFRESH_DEPENDENT ).

`COMPLETE`	Refreshes and recalculating the materialized view query definition.
`FAST`	Applies incremental changes to refresh the materialized view using the information recorded in the papers of the materialized view, or an SQL * Loader direct-path access or a partition maintenance operation.

FORCE

Applies FAST update if possible; otherwise, it applies COMPLETE Refresh.

NEVER

Indicates that the materialized view will not be updated with updating mechanisms.

Select * from version of v$.

Oracle Database 11 g Release 11.2.0.4.0 - 64 bit Production

Thank you

Çaglar wrote:

...

Also, what are the differences between FULL and FAST. Ends truncate the table and fill it up again?

...

Thank you

I just want to answer the truncated question. Seems that nobody covered that yet.

Answer: It depends.

If you do a full refresh, then the default is to use ATOMIC_REFRESH = TRUE.

This means that the update is done via an insert, delete , and ... Select.

You can change it to ATOMIC_REFRESH = FALSE (parameter dbms_mview.refresh).

This means that is a TRUNCATE and insert a ... Select with APPEND peak (path direct insert).

Refresh if Atomic = FALSE is considerably faster than the default. Also way less Archives of newspapers are written.

The downside is however that, during the update the MV is empty, is no longer an atomar operation!

What is a materialized view?

If I read oradocs on flashback instructions table and it mentions
When you delete a table, all the newspapers view materialized, defined on the table are also deleted, but are not placed in the Recycle Bin. Therefore, the materialized view logs cannot be flashed back as well as the table
(http://docs.oracle.com/cd/B28359_01/server.111/b28286/statements_9012.htm#SQLRF01802)

then I went to oradocs for the view materialized and read the first half logs.
http://docs.Oracle.com/CD/B19306_01/server.102/b14200/statements_6003.htm
Now, I know what makes a materialzed view log.
is a materialized view as a point of view however... ?

No, it isn't.

A materialized view is basically a query with its 'materialized' or stored in a table results. A MV can be used by Oracle in a manner transparent re - write a query to be faster.

Materialized view does not quickly refresh with sysdate in where clause

Hi all
I am trying to create a view, materialized with sysdate in where clause. This makes the complex query, and so I can't create a quick refreshment mview.
I tried to create with rowid too, but it does not create a quick refreshment.
I was wondering if someone can advise me, how can I accomplish this task, which would be really appreciated.
The query is:
create a materialized view PS_MEETING
build the DEFERRED payment
Refresh quickly with rowid
as
SELECT *.
MEETING M
WHERE state_desc = 'VIC '.
OR Meet_date < TRUNC (SYSDATE);

the behavior is documented: http://docs.oracle.com/cd/E11882_01/server.112/e25554/basicmv.htm#DWHSG8201

General restrictions on update quickly
The definition of the materialized view query is limited as follows:
- The materialized view must not contain references to non-repetitive phrases such as SYSDATE and ROWNUM .
So I guess that you would need a more static than sysdate condition - or another strategy update.

Re: view opaque and the materialized view

Hi Experts,
I want some clarification of opaque and view view in the physical layer OBIEE materialized
-> what is the main difference between the opaque view and materialized in the RPD perspective view, we have to do this at the level of the RPD or DB.
-> I want the list of opaque opinion and materialized in the RPD view how I should do.
-> How opaque views will degrade the performance and how a materialized view will improve performance at the level of the report.
-> In scenarios that we use view opaque and the view materialized (if possible with a scenario for the best permanent basis).
Thanks in advance.

I want some clarification of opaque and view view in the physical layer OBIEE materialized

-> What is the main difference between opaque view and create the materialized view in the RPD point of view, we have to do this at the level of the RPD or DB.

Opaque views is a SQL statement that is defined in the physical layer, OBIEE will use all in the construction of a SQL query. In a way it's not different from a database view, except it is set in OBIEE only. Alternatively, you can deploy an Opaque view, which pushes its definition in the database. Read more about it here: work with physical tables, Cubes and joins - 11 g Release 1 (11.1.1)

A materialized view (MV) is a database concept where the results of a SQL statement are physicalised like a table, and therefore as OBIEE is a MV is just another physical array

-> If I want a list of the opaque views and materialized in the RPD view how I should do.

To find opaque views, use the function «Repository of applications» administration tool Search physical Tables and set up a filter on the Type = Select

Screenshot: https://www.evernote.com/shard/s16/sh/5c843e47-bff1-4d4b-b847-be98f3a2ec09/cf060a6cd9805f687fa0b5b46f3f0020

To find materialized views, you will need to query the catalog in your database (for example select object_name, object_type from user_objects where type_objet = "MATERIALIZED VIEW" ;) and compare it to the list of tables in your SPR)

-> How opaque views will degrade the performance and how a materialized view will improve performance at the level of the report.

A materialized view is materialized, in other words, the results are already stored in the database. This means usually there will be more efficient because all the joins and aggregations, etc. will be settled in advance.

Create materialized view at the trigger.

Hello
I use version below:
Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production
PL/SQL Release 11.2.0.1.0 - Production
I created a materialized view query below:
CREATE THE FSG1_FUND000 MATERIALIZED VIEW
PCTUSED, PCTFREE 5 70
Users TABLESPACE
STORAGE (INITIAL 500K NEXT 500K)
Refresh a start fast with (sysdate) next (sysdate + (1 / 1440))
WITH rowid
AS
SELECT * FROM ABNDEV_T24. FSG1_FUND000@abndev;
This Mview if any insert or update only (WITHOUT DELETING) are coming which should be copy to another table. But in mView trigger does not work.
So pls advice me no alternative.
Querys trigger:
create or replace trigger trg_dummy
after insert or update on FSG1_FUND000
for each line
Start
If the insertion
insert into FSG1_FUND001 (RECID, XMLRECORD) values (: new.) RECID,: new. XMLRECORD);
elsif update then
insert into FSG1_FUND001 (RECID, XMLRECORD) values (: new.) RECID,: new. XMLRECORD);
end if;
end;
/
Kind regards
Villa

Hello

I learned and referred website as much as we can not able to create a trigger in MView (sorry we create trigger but none use of creation because in view no insert and update happened). So I drop completely the materialized view concepts and relaxation.

Instead of, I have using the procedure to insert records in a table and then I created one by dbms_scheduler job.

This discussion will be useful for any future reference.

-procedure-

create or replace procedure p2

as

Start

INSERT / * + APPEND * / INTO FSG1_FUND000 SELECT * FROM FSG1_FUND000@remote;

End; BluShadow

/

-----------------job--------------------

Begin

DBMS_SCHEDULER. () CREATE_JOB

job_name-online "JOB4."

job_type-online "PLSQL_BLOCK."

JOB_ACTION => ' BEGIN p2; END;',

start_date => SYSDATE,

repeat_interval => ' FREQ = MINUTELY; INTERVAL = 5;',

End_date => NULL,

-Online TRUE, enabled

comments => "Inserting a record in a table");

end;

/

Difference between the table and Materialized View

Is there an advantage outside automatic synchronization (founded refresh selected type) using Materialized View?
I came across this question as table and MV both store values, and we can also update table using the code what is the need of MV? Why not create a table instead of MV with the same definition and same charly?
I need some explanation to force someone to convince himself.
Thank you

http://docs.Oracle.com/CD/B19306_01/server.102/b14223/basicmv.htm

Sections that highlight its strengths:

1. materialized views for data warehouses

2. materialized views for distributed computing

Query, re - write, features as Materialized view log files that can be used for replication between databases, etc...

Problem with the materialized view (ORA-02345)

Hello
I am trying to create a view materialized, based on the following function:
```
CREATE OR REPLACE function RBS_USER.dynamic_pivot return sys_refcursor
as
sql_query varchar2(8000);
p_cursor sys_refcursor;


begin
    for x in (select distinct report_mm from UC_SOURCE_CUR_ACCT_CLASSIF order by 1)
    loop
        sql_query := sql_query || '''' || x.report_mm || ''' as "' || to_char(x.report_mm,'mm/dd/yyyy') || '", ';
    end loop;


    sql_query := 'select * from (
       select UC_BUSINESS_TYPE, PRODUCT_PORTFOLIO, REVENUE, REPORT_MM FROM UC_SOURCE_CUR_ACCT_CLASSIF
    )
    pivot
    (
       sum(revenue)
       for report_mm in (' || substr(sql_query,1,length(sql_query)-2) || '))';


    open p_cursor for sql_query;
    return p_cursor;
end;
```
I'm getting ORA-02345: cannot create a view with column based on CURSOR operator.
How can I re - write the code in order to to use to generate a materialized view?
Perhaps using a PIPELINED function? But the problem is that I don't know beforehand the return type that it can vary (based on a range of months in the UC_SOURCE_CUR_ACCT_CLASSIF table, which does not.
Thank you
M.R.

I'm getting ORA-02345: cannot create a view with column based on CURSOR operator.

How can I re - write the code in order to to use to generate a materialized view?

You can't - a slider is PL/SQL, SQL not and has all the data.

Perhaps using a PIPELINED function? But the problem is that I don't know beforehand the return type that it can vary (based on a range of months in the UC_SOURCE_CUR_ACCT_CLASSIF table, which does not.

Then explain how a materialized view THAT REFRESH could possibly work if the return type could change after the MV was last refreshed?

You should base a MV on real data such as returned by a SQL query.

Failed to create the fast refresh on the materialized view

Hi, I am creating a materialized on the tables with fast refresh view on commit but I get an error message.
I have created the following logs:
Bonus CREATE MATERIALIZED VIEW LOG ON
Users TABLESPACE
WITH THE PRIMARY KEY
INCLUDING THE NEW VALUES
Used to CREATE MATERIALIZED VIEW LOG ON
Users TABLESPACE
WITH THE PRIMARY KEY
INCLUDING THE NEW VALUES
I then try to create the following:
Test.BAM CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
COOL OFF QUICKLY ON COMMIT
AS
SELECT a.dept_no, SUM (a.salary)
EMPLOYEE a, b bonus
WHERE a.employee_id = b.employee_id
GROUP BY dept_no
When I do that, I get the following error:
. ORA-12032: cannot use column rowid of materialized
view log on 'test '. "" BONUS ".
If I change to a full refresh, it works pretty well. If I create a MV with a fast refresh on a query just within the limits of the table bonus it also works very well, for example ' select * bonus where employee_id = 2'
What I am doing wrong? Also when looking at the notes for MV connects in some places, he said using the primary key and others, he says to the sequence of use and row_id. Which is correct and what difference does it make?
11.2 aix.
Thank you very much

I suggest that investigate you the reason why your MV is not quickly updatable with the following method:

(1) create MV_CAPABILITIES_TABLE with @?/rdbms/admin/utlxmv.sql

(2) exec ('BAM') dbms_mview.explain_mview

3)

column format a100 msgtxt

column related_text format a20

SELECT the possible, capability_name, related_text,

msgtxt

OF mv_capabilities_table;

That should tell you the reason why he isn't yet quickly updatable.

There was a popular quote on men and fishing, but I don't remember it for now :-)

Kind regards

Uwe Hesse

Query on materialized views

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General restrictions on update quickly

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