The materialized view log and user...

Similar Questions

• effect of pump or etl data on the materialized view logs

  Hi, we are mobile/upgrading an instance of 10g to 12 c, where one materialized view logs and expect to do one of the following:

  (1) extract/import the meta, only using data pump data and move data using an etl tool

  (2) comprehensive database extract/import using the data pump in

  are there questions that we must be aware of when the displacement of these with either scenario materialized view logs?

  Thanks for any information you can provide.

  > are there questions that we should be aware of when the displacement of these materialized view logs with either scenario?

  No problem

• 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.

• MATERIALIZED View Log Index Tablespace

  Is anyone aware of the syntax or a framework to be able to specify the index of a materialized view of the journal storage space?

  We chunk our objects by tablespace - index, tables, CLOB.

  Creating a materialized view log and specifying the storage space in which it should be created created the mv log in the correct location, but the index that is created uses the default tablespace for the user.

  And Yes, I Googled it. LMGTFY

  create materialized view log on MY_TEST tablespace my_tablespace ;
  

  select table_name, tablespace_name
    from user_tables
   where table_name like 'MLOG%';
  

  TABLE-NAME	TABLESPACE_NAME
  MLOG$ _MY_TEST	MY_TABLESPACE

  select table_name, index_name, tablespace_name
    from user_indexes
   where table_name like 'MLOG%';
  

  TABLE-NAME	INDEX_NAME	TABLESPACE_NAME
  MLOG$ _MY_TEST	I_MLOG$ _MY_TEST	USERS

  I found these documents:

  Index on MLOG$ (materialized view Log): difference in behavior between 11.2.0.3 and 11.2.0.4 (Doc ID 1959657.1)

  Materialized View Log (Mlog$) Index not created in its default Tablespace (Doc ID 1959658.1)

  I guess you are running 11.2.0.4, right?

  In previous versions, no index has been created automatically for the journal of MV.

  Kind regards

  Bashar

• 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

• Overhead of triggers VS materialized view log files

  If I need to log UPDTEs, insertions and deletions on a table - is there a difference in charge through newspapers vs MV triggers?
  
  Thank you

  You said that MV newspaper is slightly more effective than a trigger. I'm curious to know why. How they work differently under the hood?

  If the essence of the debate is only why MV newspaper is more effective than the trigger that I think that Justin has stressed that is below good technical points

  1. you don't have to order at the PL/SQL engine.
  2. you also write the binary data that you will put in the newspapers of recovery instead of column-level data.
  And below the text in the documentation:

  Trigger internal for the materialized view log

  When changes are made to the master table or master materialized with DML view, an internal trigger records information about the affected rows in the materialized view log. This information includes the values of the primary key, rowid, or id of the object or both, as well as the values for the other columns in the materialized view log. It is an intern AFTER trigger LINE that runs automatically when you create a journal of materialized to view table main target or master materialized view. It inserts a line in the materialized view log, whenever an INSERT, UPDATE, or DELETE statement modifies data in the table. This trigger is always the last to fire.

  http://docs.Oracle.com/CD/B28359_01/server.111/b28326/repmview.htm#i30732

  3 trigger, i.e. we are coding for the track changes, newspaper MV i.e. tool/technology, which is provided by Oracle itself; So certainly "we are not that much able to write code that is equal to or better than the Oracle itself right?

  Feature of MV's trigger INSTEAD of, but under the hood, with close to internal components of Oracle.

  Concerning
  Girish Sharma

• question on the materialized view unregistered on the main site

  Hello
  
  you know how one knows, on the main site, on the existence of a materialized view another site referring to other tables to a primary site. It seems registration is not required.
  
  the site main orcl1: I have a table, and a materialized view log defined on A table.
  another site orcl2: have a link db orcl1 and rapid updatable view SCOTT materialized. A_MVW (create a materialized view A_MVW cool off quickly in select * from A@orcl1)
  
  on orcl1 I perform: exec DBMS_MVIEW. UNREGISTER_MVIEW (mviewowner = > 'SCOTT', mviewname = > mviewsite, 'A_MVW' = > 'ORCL2');
  so the materialized view seems to be correctly set aside (because it no longer appears in: select * from DBA_REGISTERED_MVIEWS ;))
  But, to my surprise, I can still perform refreshes fast on A_MVW, which also remove rows from the materialized view log. So how is site orcl1 always aware of the existence of the materialized view?
  
  It seems that, registered or not to the main site, a materialized view has the same... or is not? where is it stored, on the main site, information about materialized views (especially those of quickly updatable) as local tables reffer?
  
  Thank you

  See DocIDs 258634.1, 67371.1, 1031924.6
  on Oracle's Support website.

  Hemant K Collette

• Create Materialized view and Materialized view log.

  I wanted to create a materialized view with option "REFRESH QUICKLY YOU COMMIT".

  (1) table 1 - it is partitioned range + list - added primary key

  (2) View1 - having primary keys on the base table of view

  Steps to follow:

  (1) create the materialized on Table1; view journal -primary key by default

  (2) create the materialized on view1 view log.  -It gives below error.

  ORA-00942: table or view does not exist

  I wanted to create Materialized view as below

  create a materialized view

  Quickly REFRESH ON validation

  as

  Select...

  ........

  ... from table1

  where c1 (select c1 from View1 which...);

  
  

  Question:

  (1) because I am getting above error when creating journal of MV on the view. Can one create log view MV or we create a MV newspaper on the base table of view?

  (2) to create the MV with "REFRESH QUICKLY YOU COMMIT' option, we need to have the primary key on the main tables?

  
  

  Pointers on this will be really useful.
  

  
  

  Thank you

  Prasad

  "When a materialized view is maintained by the ON COMMIT method, the time required to perform the validation can be slightly longer than usual." This is because the refresh operation is performed as part of the validation process. This is why this method may not be suitable if many users at the same time change the tables on which is based the materialized view. »

  See: basis of materialized views (refreshment options) for all the other options and how they work.

• create materialized view log on the table without a primary key

  Hi all

  CREATE TABLE client_months 
  (
    SUBJ_CODE         NUMBER(4),
    SERV_CODE         NUMBER(4),
    DEBIT_CODE        NUMBER(4),
    PERIOD_NUM        NUMBER(2),
    PERIOD_NAME       VARCHAR2(40 CHAR),
    FIRST_MON_DAY     DATE,
    LAST_MON_DAY      DATE,
    VALUE_MON_DAY     DATE,
    MONTHES           NUMBER(4,2),
    GARDENING_WEIGHT  NUMBER(5,4),
    REASON_CODE       NUMBER(5),
    STAMP_ACTION      VARCHAR2(1 CHAR),
    STAMP_CDATE       DATE                        DEFAULT SYSDATE,
    STAMP_DATE        DATE,
    STAMP_USER        VARCHAR2(15 CHAR),
    REGION_CODE       NUMBER(9)
  )
  table created.
  
  CREATE UNIQUE INDEX client_months_UK  ON client_months 
  (SUBJ_CODE, SERV_CODE, DEBIT_CODE, PERIOD_NUM, REGION_CODE)
  index created.
  
  CREATE MATERIALIZED VIEW LOG ON client_months with rowid;
  
  CREATE MATERIALIZED VIEW client_months_mv 
  BUILD immediate 
  REFRESH FAST ON COMMIT 
  AS 
  SELECT * FROM client_months;
  
  ORA-12014: table 'CLIENT_MONTHS' does not contain a primary key constraint

  I don't want to refresh the mview when validation is performed on the base table.
  And I don't want to change the base table by adding a primary key.
  
  is it possible to create the mview journal using the unique index? or another solution?
  Please help
  Thanks in advance
  Naama

  Naamas wrote:
  No,
  I already read this post!

  Then you read wrong:

  SQL> CREATE TABLE client_months
    2  (
    3    SUBJ_CODE         NUMBER(4),
    4    SERV_CODE         NUMBER(4),
    5    DEBIT_CODE        NUMBER(4),
    6    PERIOD_NUM        NUMBER(2),
    7    PERIOD_NAME       VARCHAR2(40 CHAR),
    8    FIRST_MON_DAY     DATE,
    9    LAST_MON_DAY      DATE,
   10    VALUE_MON_DAY     DATE,
   11    MONTHES           NUMBER(4,2),
   12    GARDENING_WEIGHT  NUMBER(5,4),
   13    REASON_CODE       NUMBER(5),
   14    STAMP_ACTION      VARCHAR2(1 CHAR),
   15    STAMP_CDATE       DATE                        DEFAULT SYSDATE,
   16    STAMP_DATE        DATE,
   17    STAMP_USER        VARCHAR2(15 CHAR),
   18    REGION_CODE       NUMBER(9)
   19  )
   20  /
  
  Table created.
  
  SQL> CREATE UNIQUE INDEX client_months_UK  ON client_months
    2  (SUBJ_CODE, SERV_CODE, DEBIT_CODE, PERIOD_NUM, REGION_CODE)
    3  /
  
  Index created.
  
  SQL> CREATE MATERIALIZED VIEW LOG ON client_months with rowid
    2  /
  
  Materialized view log created.
  
  SQL> CREATE MATERIALIZED VIEW client_months_mv
    2  BUILD immediate
    3  REFRESH FAST WITH ROWID ON COMMIT -- pay attention to WITH ROWID
    4  AS
    5  SELECT * FROM client_months
    6  /
  
  Materialized view created.
  
  SQL>
  

  SY.

• Impact on performance at the addition of materialized view logs at the tables?

  I write a very complex query for a client of our database system transaction and this will require the creation of a materialized viewbecause, all attempts at development to make acceptable performance failed.
  
  I want to activate the fast refresh the MVIEW but I am confused about the consequences of the addition of the addition of materialized view logs to the base tables.
  
  Some tables are large and involved in a large number of transactions and I wonder if the INSERT/update performance will be seriously affected by the presence of a newspaper mview.
  
  Maybe it's a simple question, but I was unable to find an answer very clear in the literature.
  
  Thanks for all the answers!
  
  Chris Mills
  Biotechnology data management consultant

  There is an overload for the newspapers of the view materialized, a little less, but roughly on par with a trigger that writes to a table.

  If it is an OLTP system where you do a lot of low-value transactions, the general expenses percentage is probably not particularly great, something in the range of 5-10% maybe (although, of course, by running tests in the development environment would be desirable). If there are loads in bulk, the impact of the percentage could be higher.

  Justin

• Calendar view-only and users are unable to change the time.

  We use Windows Server 2003 R2 active directory and group policy.

  Group Policy, we blocked sytem time change but after this timetable can also test block user cannt read calander also

  pls sugget me to resolve this issure

  Calendar view-only and users are unable to change the time.

  Hi sunil77,

  Your question about changes in UAC using Group Policy on Windows Server 2003, it will be better answered by the experts in the Group Policy Forum. Please repost your question to the address provided.

• 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.

• 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

• diff between the view and the materialized view

  Hi all
  
  Whats different between the view and the materialized view?
  
  could someone help me pls this topic
  
  thnks in advance

  See nothing else that a set is a set of sql statements that join the single or multiple tables and shows the data... However views do not have the data themselves but point to the data.

  Whereas the materialized view is a concept used primarily in the Datawarehousing... these views contain the data itself. Reason being, it is more easy/quick access to the data. The main objective of Materialized view is to perform calculations and display data from multiple tables by using joins.
  check out the link for more information below.
  http://www.geekinterview.com/question_details/29332

  rajeysh
  http://oracleinstance.blogspot.com

• 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...