By creating the Materialized view all size changes to columns

I'm creatine a materialized view based on the table in a different database.
The table on which the created materialized view (database table) is to have the size of CHAR (1 byte) column. But in Materialized view this size columns showing as CHAR (3 bytes).

Could u please help me.., why this is happening?

Thank you
Sachin

Sachin thombare wrote:
I'm creatine a materialized view based on the table in a different database.
The table on which the created materialized view (database table) is to have the size of CHAR (1 byte) column. But in Materialized view this size columns showing as CHAR (3 bytes).

Could u please help me.., why this is happening?

Thank you
Sachin

Hello
Do both the database involved in this have defined different character.
If Yes, then this is a known behavior.

Concerning
Anurag Tibrewal.

Tags: Database

Similar Questions

Error ORA-01115 creating the materialized view

Hi friends,
When I create a materialized view it by throwing some error
CREATE THE PNR_RES_MV MATERIALIZED VIEW
TABLESPACE FAS
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
IMMEDIATE CONSTRUCTION
REFRESH THE STRENGTH TO DEMAND
WITH THE PRIMARY KEY
AS
SELECT C_CREATION_DATE, C_PNR, B.CARRIER_CD1, B.CARRIER_CD2, B.CURRENT_STATUS_CD, A.CANCELLED_IND, A.BOOKING_OFFC_NMBR,-, B.LEG_NMBR, C_PAX_NMBR
COUNT (CASE WHEN TRIM (B.CURRENT_STATUS_CD) = "HK" AND (TRIM (C_CHANGE_OR_CANCELL_IND) = "OR C_CHANGE_OR_CANCELL_IND IS NULL) THEN 1 OTHER TRAILING NULL) CONFIRMED_COUNT,.
COUNT (CASE WHEN (B.CURRENT_STATUS_CD) TRIM = "HK" AND (TRIM (C_CHANGE_OR_CANCELL_IND) = "or C_CHANGE_OR_CANCELL_IND IS NULL) null THEN 1 OTHER END) cancELLED_COUNT
OF PNR_RES_LEG_PAX_MV B, PNR_RES HAS
WHERE A.PNR = B.PNR
AND a.CREATION_DATE = b.CREATION_DATE
- and A.BOOKING_OFFC_NMBR = '1F'
- AND C_PNR = 'XE76V. '
AND A.FILE_UPDATE_DATE. A.UPDATE_DATE IN (SELECT MAX (D.FILE_UPDATE_DATE |)) (UPDATE_DATE) OF PNR_RES D WHERE D.PNR = B.PNR AND D.CREATION_DATE = B.CREATION_DATE)
GROUP OF C_CREATION_DATE, C_PNR, B.CARRIER_CD1, B.CARRIER_CD2, B.CURRENT_STATUS_CD, A.CANCELLED_IND, A.BOOKING_OFFC_NMBR;

When executing it it gives this error

ORA-01115: reading block IO file error 4 (block # 63757)
ORA-01110: data file 4: ' D:\APP\IGT\ORADATA\ORCL\USERS01. DBF'
ORA-27070: async read/write failed
OSD-04006: ReadFile() failure, unable to read the file
S/O-error: (27 OS) the drive cannot find the sector requested.

And I checked through RMAN
RMAN > validate the audit logic datafile 4;
From post 11 March 14
using the control file of the target instead of recovery catalog database
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID = 127 type device = DISK
channel ORA_DISK_1: starting from the data file validation
channel ORA_DISK_1: datafile (s) for specification validation
Enter a number of file datafile = 00004 name = D:\APP\IGT\ORADATA\ORCL\USERS01. DBF
RMAN-00571: ===========================================================
RMAN-00569: = ERROR MESSAGE STACK FOLLOWS =.
RMAN-00571: ===========================================================
RMAN-03009: failure to validate the command channel ORA_DISK_1 11/03/2014 13:0
04:12
ORA-19501: read error on the file 'D:\APP\IGT\ORADATA\ORCL\USERS01. DBF', block numbe
r 63745 (block size = 8192)
ORA-27070: async read/write failed
OSD-04016: error queuing an asynchronous i/o request.
S/O-error: (27 OS) the drive cannot find the sector requested.

Please suggest me what to do it is a mistake to associate related database or OS. DB version is - 11 GR 2

Kind regards

Arya

This is the error message that you should focus:

> O/S-error: (27 OS) the drive cannot find the sector requested.

Run disk checker utilities, eventually the file system is damaged.

Hemant K Collette

performance of the queries on the main tables of the materialized view vs
Hello

I'm afraid of strange behavior in db, on my paintings of master UDBMOVEMENT_ORIG (26mil.rows) and UDBIDENTDATA_ORIG (18mil.rows) is created the materialized view TMP_MS_UDB_MV (UDBMOVEMENT stands for this object) that meets certain default conditions and the join on these paintings of master condition. MV got on the lines of 12milions. I created MV for poll not so huge objects, MV got 3GB, paintings of master toghether 12 GB. But I don't understand that physical reads and becomes compatible is less on MV that on the main tables, the final execution time is shorter on the master tables. See my journal below.

Why?

Thanks for the replies.

SQL > set echo on
SQL > @flush
SQL > alter system flush buffer_cache;

Modified system.

Elapsed time: 00:00:00.20
SQL > alter system flush shared_pool;

Modified system.

Elapsed time: 00:00:00.65
SQL > SELECT
UDBMovement.zIdDevice 2, UDBMovement.sDevice, UDBMovement.zIdLocal, UDBMovement.sComputer, UDBMovement.tActionTime, UDBIdentData.sCardSubType, UDBIdentData.sCardType, UDBMovement.cEpan, UDBMovement.cText, UDBMovement.lArtRef, UDBMovement.sArtClassRef, UDBMovement.lSequenz, UDBMovement.sTransMark, UDBMovement.lBlock, UDBMovement.sTransType, UDBMovement.lGlobalID, UDBMovement.sFacility, UDBIdentData.sCardClass, UDBMovement.lSingleAmount, UDBMovement.sVAT, UDBMovement.lVATTot, UDBIdentData.tTarifTimeStart, UDBIdentData.tTarifTimeEnd, UDBIdentData.cLicensePlate, UDBIdentData.lMoneyValue, UDBIdentData.lPointValue, UDBIdentData.lTimeValue, UDBIdentData.tProdTime, UDBIdentData.tExpireDate
UDBMOVEMENT_orig UDBMovement 3, Udbidentdata_orig UDBIdentData
4. WHERE
5 UDBMovement.lGlobalId = UDBIdentData.lGlobalRef (+) AND UDBMovement.sComputer = UDBIdentData.sComputer (+)
6 AND UDBMovement.sTransType > 0 AND UDBMovement.sDevice < 1000 AND UDBMovement.sDevice > = 0 AND UDBIdentData.sCardType IN (2) AND (bitand(UDBMovement.sSaleFlag,1) = 0 AND bitand(UDBMovement.sSaleFlag,4) = 0) AND UDBMovement.sArtClassRef < 100
7 AND UDBMovement.tActionTime > = TO_DATE (May 5, 2011 00:00:00 ',' dd/mm/yyyy hh24:mi:ss') + 0.25 AND UDBMovement.tActionTime < TO_DATE (May 5, 2011 00:00:00 ',' dd/mm/yyyy hh24:mi:ss') + 0.5
8 ORDER BY tActionTime, lBlock, lSequenz;

4947 selected lines.

Elapsed time: 00:00:15.84

Execution plan
----------------------------------------------------------
Hash value of plan: 1768406139

------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | TempSpc | Cost (% CPU). Time |
------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 7166 | 1238K | 20670 (1) | 00:04:09 |
| 1. SORT ORDER BY | 7166 | 1238K | 1480K | 20670 (1) | 00:04:09 |
| 2. NESTED LOOPS |
| 3. NESTED LOOPS | 7166 | 1238K | 20388 (1) | 00:04:05 |
|* 4 | TABLE ACCESS BY INDEX ROWID | UDBMOVEMENT_ORIG | 7142 | 809K | 7056 (1) | 00:01:25 |
|* 5 | INDEX RANGE SCAN | IDX_UDBMOVARTICLE | 10709. 61 (0) | 00:00:01 |
|* 6 | INDEX UNIQUE SCAN | UDBIDENTDATA_PRIM | 1 | | | 1 (0) | 00:00:01 |
|* 7 | TABLE ACCESS BY INDEX ROWID | UDBIDENTDATA_ORIG | 1. 61. 2 (0) | 00:00:01 |
------------------------------------------------------------------------------------------------------------

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

4 - filter("UDBMOVEMENT".") STRANSTYPE"> 0 AND 'UDBMOVEMENT '. "" SDEVICE ' < 1000 AND
BITAND ("SSALEFLAG", 1) = 0 AND "UDBMOVEMENT". "" SDEVICE ' > = 0 AND BITAND ("UDBMOVEMENT". "SSALEFLAG «(, 4) = 0)" "
5 - access("UDBMOVEMENT".") TACTIONTIME' > = TO_DATE (' 2011-05-05 06:00 ',' syyyy-mm-jj)
('HH24:mi:SS) AND "UDBMOVEMENT". "' TACTIONTIME ', TO_DATE (' 2011-05-05 12:00 ',' syyyy-mm-jj)
('HH24:mi:SS) AND "UDBMOVEMENT". ("' SARTCLASSREF" < 100)
filter ("UDBMOVEMENT". "SARTCLASSREF" < 100)
6 - access("UDBMOVEMENT".") LGLOBALID "=" UDBIDENTDATA. " "" LGLOBALREF "AND
'UDBMOVEMENT '. "' SCOMPUTER"="UDBIDENTDATA." ("' SCOMPUTER")
7 - filter("UDBIDENTDATA".") SCARDTYPE "= 2)

Statistics
----------------------------------------------------------
543 recursive calls
0 db block Gets
84383 compatible Gets
4485 physical reads
0 redo size
533990 bytes sent via SQL * Net to client
3953 bytes received via SQL * Net from client
331 SQL * Net back and forth to and from the client
kinds of 86 (memory)
0 sorts (disk)
4947 lines processed

SQL > @flush
SQL > alter system flush buffer_cache;

Modified system.

Elapsed time: 00:00:00.12
SQL > alter system flush shared_pool;

Modified system.

Elapsed time: 00:00:00.74
SQL > SELECT UDBMovement.zIdDevice, UDBMovement.sDevice, UDBMovement.zIdLocal, UDBMovement.sComputer, UDBMovement.tActionTime, UDBMovement.sCardSubType, UDBMovement.sCardType, UDBMovement.cEpan, UDBMovement.cText, UDBMovement.lArtRef, UDBMovement.sArtClassRef, UDBMovement.lSequenz, UDBMovement.sTransMark, UDBMovement.lBlock, UDBMovement.sTransType, UDBMovement.lGlobalID, UDBMovement.sFacility, UDBMovement.sCardClass, UDBMovement.lSingleAmount, UDBMovement.sVAT, UDBMovement.lVATTot, UDBMovement.tTarifTimeStart, UDBMovement.tTarifTimeEnd, UDBMovement.cLicensePlate, UDBMovement.lMoneyValue, UDBMovement.lPointValue, UDBMovement.lTimeValue, UDBMovement.tProdTime
2. OF UDBMOVEMENT WHERE
3 UDBMovement.sTransType > 0 AND UDBMovement.sDevice < 1000 AND UDBMovement.sDevice > = 0 AND UDBMovement.sCardType IN (2) AND (bitand(UDBMovement.sSaleFlag,1) = 0 AND bitand(UDBMovement.sSaleFlag,4) = 0) AND UDBMovement.sArtClassRef < 100
4. AND UDBMovement.tActionTime > = TO_DATE (May 5, 2011 00:00:00 ',' the hh24: mi: ss' dd/mm/yyyy) + 0.25
5 AND UDBMovement.tActionTime < TO_DATE (May 5, 2011 00:00:00 ',' the hh24: mi: ss' dd/mm/yyyy) + 0.5 ORDER BY tActionTime, lBlock, lSequenz;

4947 selected lines.

Elapsed time: 00:00:26.46

Execution plan
----------------------------------------------------------
Hash value of plan: 3648898312

-----------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-----------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 2720 | 443K | 2812 (1) | 00:00:34 |
| 1. SORT ORDER BY | 2720 | 443K | 2812 (1) | 00:00:34 |
|* 2 | MAT_VIEW ACCESS BY INDEX ROWID | TMP_MS_UDB_MV | 2720 | 443K | 2811 (1) | 00:00:34 |
|* 3 | INDEX RANGE SCAN | EEETMP_MS_ACTTIMEDEVICE | 2732 | 89 (0) | 00:00:02 |
-----------------------------------------------------------------------------------------------------------

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

2 - filter("UDBMOVEMENT".") STRANSTYPE"> 0 AND BITAND ("UDBMOVEMENT". "SSALEFLAG «(, 4) = 0 AND" "
BITAND ("SSALEFLAG", 1) = 0 AND "UDBMOVEMENT". ("' SARTCLASSREF" < 100)
3 - access("UDBMOVEMENT".") TACTIONTIME' > = TO_DATE (' 2011-05-05 06:00 ',' syyyy-mm-jj)
('HH24:mi:SS) AND "UDBMOVEMENT". "" SDEVICE ' > = 0 AND "UDBMOVEMENT". ' SCARDTYPE ' = 2 AND ".
'UDBMOVEMENT '. "" TACTIONTIME "< TO_DATE(' 2011-05-05 12:00:00', 'syyyy-mm-dd hh24:mi:ss') AND
'UDBMOVEMENT '. ("' SDEVICE ' < 1000)
filter ("UDBMOVEMENT". "SCARDTYPE"= 2 AND "UDBMOVEMENT"." SDEVICE' < 1000 AND
'UDBMOVEMENT '. ("' SDEVICE ' > = 0)

Statistics
----------------------------------------------------------
449 recursive calls
0 db block Gets
6090 gets coherent
2837 physical reads
0 redo size
531987 bytes sent via SQL * Net to client
3953 bytes received via SQL * Net from client
331 SQL * Net back and forth to and from the client
168 sorts (memory)
0 sorts (disk)
4947 lines processed

SQL > spool off

Published by: MattSk on February 4, 2013 14:20
>
The second query makes a full table of materialized view scan.
>
What you base that statement on?

I do not see any table full scan in terms of the second query. All I see is
>
* 2 MAT_VIEW ACCESS BY INDEX ROWID TMP_MS_UDB_MV 2720 443K 2811 (1) 00:00:34

Creating dynamic materialized views: insufficient Privileges?
Hi all

I am currently doing a procedure that will recreate materialized views as columns are deleted or added to a table by the selection of the user to the application level. I wrote the procedure, and it displays the correct syntax to create a materialized view. However once I pass this dynamic sql statement to be executed immediately, it fails, saying: I don't have sufficient privileges. I have sysdba grants on this user in my dev environment. What Miss me? Has it something to do with immediate execution and the privileges associated with the use that? Any help would be greatly appreciated!

Kind regards
TimS
Within a stored (by default) procedure DEFINER rights, only the privileges that are granted directly to the user, not those granted through a role as SYSDBA, are available.

-If you change the stored procedure to use the rights of the applicant, the privileges granted through a role are visible. However, this requires that the appellant, not the owner of the procedure has the permissions to create the materialized view.
-If you grant the CREATE MATERIALIZED VIEW privilege (and all other privileges your code requires) directly to the user, which would also solve the problem.

Justin

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.

Refresh the Materialized View constructed from an external table commit?
Is it possible to create a materialized with Refresh view on commit built from an external table?

I think the answer is "no, because there is no way for the outer table report to the view materialized it has been changed," but I would like to be sure before I tell my client who has requested the opportunity to do this (or, Alternatively, to learn how Oracle hoops I have to cross in order to operate).

I can create a Refresh on demand, it is not a question of not having the necessary permissions to create the materialized view itself.
No, you can't. The outer table is not modified in a transactional way and there no materialized view logs, so there is no event to hang in and no delta to apply.

However, you can use dbms_scheduler observer file that will ask for the presence of a file and load the data in a table or refresh a materialized view based on the external table.

Justin

I get "failed to set the refresh attribute COMMIT for the materialized view" when I try to create a MV using a table and another MV

Experts,
I'm trying to create a YOUNG refreshable ON COMMIT MV (xyz) using a table (circuit) and quickly updateable on validation MV (abc), but get an error:
SQL error: ORA-12054: cannot set the attribute ON COMMIT refresh for the materialized view
12054 00000 - "cannot set the refresh attribute COMMIT for the materialized view.
* Cause: The materialized view did not meet the requirements for update to
moment of validation.
* Action: Specify only valid options.
1] MV abc
= MV abc defined as below =.
CREATE MATERIALIZED view abc_MV
Immediate CONSTRUCTION
REFRESH QUICKLY YOU COMMIT using constraints of trust
WITH ROWID AS SELECT n.*,.
n.ROWID noderowid
node n
where n.nodetype in (1610000069,1610007267);

-Above works OK and MV connect you on table node is created successfully
=====================================================
[ 2] Circuit Board
======================================================
CREATE MATERIALIZED VIEW LOG ON Cramer.Circuit WITH SEQUENCE, ROWID ( ) -all columns of table ofcircut parentheses
INCLUDING THE NEW VALUES;
-More top works OK and MV connect you on table circuit is created successfully
======================================================

[3] trying to create MV xyz
======================================================
CREATE MATERIALIZED VIEW LOG ON cramer.abc_MV WITH SEQUENCE, ROWID ( ) -all columns of abc_MV brackets
INCLUDING THE NEW VALUES;
-Above works OK and log on ABC MV MV gets created successfully
-Problematic step below
Xyz_MV CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
REFRESH QUICKLY YOU COMMIT using constraints of trust
AS
SELECT c., c.rowid circuit_rowid, n.rowid tr_rowid
the circuit c, abc_mv n
where circuit2startnode = n.nodeid
and c.rpplanId = n.rpplanId;
==========================================================
Clues on how to solve this problem and make quickly updatable ON Commit MV xyz
Thanks in advance.

Chanchal,

If you can read my original post carefully you may have noticed that all these restrictions will not apply in my case.

All,

In any case I found the solution to my problem.

There are a few additional restrictions for materialized views multilayer

Additional Restrictions for master materialized views

The following types of materialized views may not be masters of editable materialized views:
- ROWIDmaterialized views
- Complex materialized views
- Read-only materialized views
I've updated the underlying MV abc below and everything worked like a charm

CREATE MATERIALIZED view abc_MV

Immediate CONSTRUCTION

REFRESH QUICKLY YOU COMMIT using constraints of trust

IN SELECT

n.*, n.rowid noderowid, nt.rowid nodetyperowid

the node n, nodetype_m nt

where n.node2nodetype = nt.nodetypeid

and nt.nodetypeid in (1610000069,1610007267);

Note: To ADD a join without which I was getting error below (although had primary key on the table of the node)

SQL error: ORA-23415: materialized view log for "NODE" does not save the primary key

23415 00000 - "view the log for materialized \"%s\".\"%s\"does not save the primary key.

* Cause: A primary key materialized view is refreshed quickly, but the

The materialized view log does not record the primary key information.

* Action: Use CREATING MATERIALIZED VIEW LOG... Command to add a PRIMARY KEY to

start recording of the primary key information in the materialized view

Newspaper.

Change the definition of the materialized view while maintaining access for users uninteruupted

Hello
We have a system report and the need to change the report definition mv access - like to do it without interruption.
Is this possible?
the sql behind mv was change picks up so column of another table.
Have you heard but not used for dbms_redefinition tables
Thank you

It is built in the Oracle solution for this one, where you can edit the definition WITHOUT interruption. You can drop the materialized view existing with the clause "save table" and rebuilt the view materialized on 'predefined table'. I googled this example for you

create materialized view mv1 as select dept , count(*) as cnt from scott.emp;

We want to change the statement so that only dept more 5 will be calculated
```
drop materialized view mv1 preserve table;
```
Notice that PRESERVE TABLE clause - mv1 table is not droped - single layer mview.
```
desc mv1
```
now, we create the mview with a different query on top of the existing table
```
create materialized view mv1 on prebuilt table as  select dept , count(*) as cnt from scott.emp where dept > 5;
```
Notice that on prebuilt table the mview uses the existing object clause.
```
exec dbms_mview.refresh_mview('mv1');
```
http://StackOverflow.com/questions/18085894/redefine-MATERIALIZED-view-with-no-downtime

http://Arup.blogspot.com/2009/01/ultra-fast-MV-alteration-using-prebuilt.html

Difference between the view and the materialized view
Hi all

Can someone tell me exactly the difference between the view and materialized views?
Hello

View:-this is a virtual table means table is there, but in fact is not there...
see how to create a view...
```
 create or replace view aaa as select * from emp; 
```
Now, when we choose the AAA, he will show me all the data that would be returned by running a query "Select * from emp"... Thus, all data will come from table iteself.
View in itself is nothing but just a Sql statement that is used to create the view, in this case definition is "select * from emp.
Any update in the database table Emp which is in our case, would automatically result in the view...
Any changes (all dml) will actually update the base table (conditions apply *)

Now the materialized view:-this is the same as except that it is not a virtual table... This will be created separately and it will acutally hold the result of the query that is used to create it. Any subsequent changes in the base table only will be included in the opinion of M M view is refreshed...

Constraints foreign key in materialized views can be changed (approx 1-master)
I have a system which consists of a master database and a bunch of materialized view sites homogeneous. 10.2.0.4 all around. Main server is Windows Server 2003. all remote nodes are Windows XP. All materialized views are editable. There are only 20 or two tables (materialized views). Users enter data in the system at the level of the remote nodes via an application.

There are data integrity constraints in the database on the main site. In the hunt for replication errors, I discovered that the integrity constraints do not exist in the context of the remote node. Then, sometimes, that users can enter data not valid that main site integrity constraints disallow, producing errors of replication on the master site. For a test I then implemented manually some of the constraints on a remote node using the java Enterprise Manager UI. Constraints have behaved as expected, as far as I can tell.

My ultimate goal is to implement, on all sites of the materialized view, the current constraints of the integrity of the main site, so that entering data at remote sites is governed by the integrity constraints.

I looked briefly package DBMS_REPCAT subprograms. Nothing jumped out at me.

I started to collect the DDL (ALTER TABLE... ADD CONSTRAINT...) I could run each site through SQL * more sheet calculation.

Then I thought that maybe I could use sqldeveloper to run the DDL but when I open the relevant schema to the level of the remote nodes, the actual tables are not shown, only the USLOG$ _... things. Materialized views are shown - but they do not have a constraints tab.

After some time in the manuals, I decided that I have a good knowledge of what I see; and that's why I'm not sure I'm running in the right direction.

I will summarize two questions:

(1) what is the best way for me to apply constraints of integrity of the master site existing in materialized views can be changed on all nodes?

(2) why I can see and work on the tables on the remote nodes via the EM java, but don't can't see them via sqldeveloper, logged in with the same account twice?

P.S. It is possible for me to delete and re-create all databases and the views materialized on all remote nodes. It is not a high volume system, and there are windows of time during which I can do these things if necessary. I don't expect a structural change to the database, so I don't need to be able to spread future changes, just make things sync'd up now.

Published by: Clark October 10, 2008 11:38
Hi Clark,.
you are right THAT FK on mviews can cause many problems during refresh. I mentioned on delete cascade, but delete the null value or remove restricted can cause problem too. You cannot complete with active reftesh FK referencing MV PK.

Because you cannot control the mviews refresh a refresh Group, that the problems I described before can occur.
You have to my view of these possibilities:
1 / move Ref. integrity check from the DB to the logic of the application
2 / use triggers to maintain ref.integrity check DB
3 / mutlimaster user instead of mviews replication

But none of them have their more and less.
1 / + FK is checked - take some time, any other manipulation of data through the application can break rules FK
2 / + FK is cheked on DB level - you write triggers, lower performance, changing disorders tables
3 / + FK is chedked at the DB level, - all the data is replicated on the table plan (for MV, you can define where cluase for replication mutlimaster not), with more than two masters, it is difficult to define the replication conflict resolition method that convert in the last time.

Last post:
I my case I use this "thing":
Because our request has not been managed in environment 24 x 7 I wrote my own routine to refresh.
This routine that follows:
1 / disable necessary FK
2 / call dbms_refresh.refresh to perform the refresh of the refresh Group
3 / activate FK disabled in step 1 with the novalidate
Refresh the jobs was launched at night.

The Materialized View - ORA-12052: is unable to fast refresh materialized view

Hello
I was hitting my head all day trying to create materialized views. I have made some progress, but have hit a brick wall, unfortunately!
Basically, I have been invited to take a view and see if I can get the benefits of performance by transforming all or part of it in materialized views. Because the underlying tables of the config is updated quite frequently, I want to fast refresh materialized views on commit. However, when I try to create a materialized view containing an outer join in an aggregated materialized view table, I get ORA-12052: is unable to fast refresh materialized view.
I went through the documentation and also Rob van Wijkvery useful series of blogs on the topic (especially http://rwijk.blogspot.co.uk/2009/09/fast-refreshable-materialized-view.html) but have not found anything that matches. Maybe I missed something somewhere along the line, or maybe I'm asking just something completely impossible?
My db is 11.2.0.2.
Here's the test scripts, I've worked with that:
drop materialized view test1_test2_mv;
Drop materialized view test2 journal;
drop table test2;
Drop materialized view test1_mv newspaper;
drop materialized view test1_mv;
Drop materialized view test1 journal;
drop table test1;
create table test1 (identification number,
type varchar2 (10),
number of Val,
update_time date,
constraint t1_pk primary key (id, type, val));

Insert into test1
Select 1, 'a', 1001, sysdate - 10/24 Union double all the
Select 1, 'b', 1003, sysdate - 9/24 Union double all the
Select 1, 'c', 1002, sysdate - 8/24 Union double all the
Select 1, had ', 1004, sysdate - 7/24 Union double all the
Select 1, 'e', 1005, sysdate - 6/24 Union double all the
Select 1, 'c', 1006, sysdate - 5/24 Union double all the
Select 2, 'a', 1002, sysdate - 4/24 Union double all the
Select 2, 'b', 1005, sysdate - 3/24 Union double all the
Select 3, 'a', 1001, sysdate - 2/24 Union double all the
Select 3, 'c', 1006, sysdate - 1/24 Union double all the
Select 3, 'e', 1008, sysdate - 2/24 Union double all the
Select option 4, has ', 1004, sysdate - 3/24 Union double all the
Select 5, 'b', 1002, sysdate - 4/24 Union double all the
Select 5, 'g', 1001, sysdate - 5/24 Union double all the
Select 6, 'h', 1004, sysdate - 6/24 Union double all the
Select 7, 'b', 1007, sysdate - 7/24 Union double all the
Select 7, had ', 1001, sysdate - 8/24 double;
commit;
Select * from test1;

CREATE MATERIALIZED VIEW LOG ON test1
WITH rowid, primary key (update_time)
including the new values;

Test1_mv CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
COOL OFF QUICKLY ON COMMIT
Did YOU SELECT id,
MAX (case when type = "there" end of val) THAT col_a,.
MAX (case when type = 'b', then val end) AS col_b,.
MAX (case when type = 'c' then end val) AS col_c,.
MAX (case when type = ' then end of val) AS col_d,
MAX (update_time) AS update_time
OF test1
WHERE TYPE in ('a',
« b »,
« c »,
a ')
GROUP BY id;
CREATE MATERIALIZED VIEW LOG ON test1_mv
WITH rowid
including the new values;

create table test2 (identification number,
col2 number,
COL3 varchar2 (10),
number of COL4,
constraint t2_pk primary key (id));

Insert into test2
Select 1, 1, 'bob', 1 double Union all
Select 2, 1, "sue", 1 double Union all
Select 3, 1, 'tom', 1 double Union all
Select 4, 1, 'jay', 1 double Union all
Select 5, 1, 'art', 1 double Union all
Select 6, 1, 'kay', 1 double Union all
Select 7, 1, 'max', 1 double Union all
Select 8, 1, 'tim', 1 double Union all
Select 9, 1, "liz", 1 from dual;
commit;

CREATE MATERIALIZED VIEW LOG ON test2
WITH rowid, primary key
including the new values;

Test1_test2_mv CREATE MATERIALIZED VIEW
IMMEDIATE CONSTRUCTION
COOL OFF QUICKLY ON COMMIT
LIKE SOME t2.rowid,.
T1.ID,
T1.col_a,
T1.col_b,
T1.col_c,
T1.col_d,
T1.update_time,
T2.col2,
T2. COL3
OF test1_mv t1,.
Test2 t2
WHERE (+) t1.id = t2.id; -symbol of outer join is not correctly displayed on the forums without space, grr!
ORA-12052: is unable to fast refresh materialized view TEST1_TEST2_MV
Y at - it any way I can get the materialized view fast refresh on commit or I asking the impossible?

Add t1.rowid:

SQL > CREATE MATERIALIZED VIEW test1_test2_mv

2 BUILD IMMEDIATE

3 QUICK REFRESH YOU COMMIT

4 AS t2.rowid SELECT rid2,

5 t1.rowid rid1,

6 t1.id

T1.col_a 7,.

T1.col_b 8,.

T1.col_c 9,.

T1.col_d 10,

T1.update_time 11,

T2.col2 12,

13 t2.col3

14 OF test1_mv t1,

15 test2 T2

16 WHERE t1.id = t2.id

17.

Materialized view created.

SQL > select * from test1_test2_mv

2.

RID2 RID1 ID COL_A, COL_B, COL_C COL_D UPDATE_TIME COL2 COL3

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

AAAYB6AANAAAANDAAA AAAYB/AANAAAAN/AAA 1 1001 1003 1006 1004 25 / 06 / 2014 12:54:16 1 bob

AAAYB6AANAAAANDAAB AAAYB/AANAAAAN/AAB 2 1002 1005 25 / 06 / 2014 1 sue 14:54:16

AAAYB6AANAAAANDAAC AAAYB/AANAAAAN/AAC 3 1001 1006 25 / 06 / 2014 16:54:16 1 tom

AAAYB/AANAAAAN/AAD AAAYB6AANAAAANDAAD 4 1004 25/06/2014 14:54:16 1 jay

AAAYB6AANAAAANDAAE AAAYB / AANAAAAN / AAE 5 1002 2014/06/25 13:54:16 1 art

AAAYB6AANAAAANDAAF AAAYB/AANAAAAN/AAG 7 1007 1009 25 / 06 / 2014 10:54:16 max 1

AAAYB/AANAAAAN/AAH                                                                                                        1 tim

AAAYB/AANAAAAN/AAF                                                                                                        1 kay

AAAYB/AANAAAAN/AAI                                                                                                        1 liz

9 selected lines.

SQL > update of test2

2 set col3 = "fly."

3 where id = 7

6 m

1 line update.

SQL > validation

2.

Validation complete.

SQL > select * from test1_test2_mv

2.

RID2 RID1 ID COL_A, COL_B, COL_C COL_D UPDATE_TIME COL2 COL3

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

AAAYB6AANAAAANDAAA AAAYB/AANAAAAN/AAA 1 1001 1003 1006 1004 25 / 06 / 2014 12:54:16 1 bob

AAAYB6AANAAAANDAAB AAAYB/AANAAAAN/AAB 2 1002 1005 25 / 06 / 2014 1 sue 14:54:16

AAAYB6AANAAAANDAAC AAAYB/AANAAAAN/AAC 3 1001 1006 25 / 06 / 2014 16:54:16 1 tom

AAAYB/AANAAAAN/AAD AAAYB6AANAAAANDAAD 4 1004 25/06/2014 14:54:16 1 jay

AAAYB6AANAAAANDAAE AAAYB / AANAAAAN / AAE 5 1002 2014/06/25 13:54:16 1 art

AAAYB/AANAAAAN/AAH                                                                                                        1 tim

AAAYB/AANAAAAN/AAF                                                                                                        1 kay

AAAYB/AANAAAAN/AAI                                                                                                        1 liz

AAAYB6AANAAAANDAAF AAAYB/AANAAAAN/AAG 7 1007 1009 25 / 06 / 2014 10:54:16 1 rob

9 selected lines.

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.

The materialized view log and user...
Hello
Suppose a user, we will call him A has a table and another user B must create a log of materialized view on the table that a user has.
While user B have all the privileges of object (direct priv insert, update, delete... not through a role) on the table to the user may not create a log of mv on this table on its schema...
Thus, the insert/update/delete stmts on < table_name > are run successfully (after having logged on as user B).

The error message ' ORA-00942: table or view does not exist ' appears when I run the command:
Connect B/B;
create log view materialized on table_name with sequence including new values;

Note: I use ORADB 10.2.0.4 and it stands for table-name to user B (which tries to create the log of mv on)...

The req. above is possible somehow?

Thank you
SIM
The documentation says the following:

The materialized view log is created in the same schema as the master of the target.

HTH!

How to improve the materialized view Refresh speed?
Hello

Are there tips to improve the speed of refresh of the materialized views?
All documentation or advice are appreciated!

Thank you!
Agree with S_Lindenmayr, if possible, the fast refresh should be used to speed up the update because it syncs MV with only the changes since the previous update (instead of the refresh). To implement the Fatst update, fortunately, with 10 g +, Oracle provides a counselor with the TUNE_MVIEW procedure. Step by step to find in week 12 of the Top 20 features the famous Arup Nanda 10 g for the series of DBA http://www.oracle.com/technology/pub/articles/10gdba/week12_10gdba.html

Tarraf

By creating the Materialized view all size changes to columns

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