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
Tags: Database
Similar Questions
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ORA-12096: error in materialized view log
Hi all
I had created a display of fast refresh materialized. Log was also created.
Now, I dropped the mv and newspapers.
But now, every time I update or insert into the customer table I receive the error message.
ORA-12096: error in materialized view log on the client
ORA-00942: table or view does not exist
There are entries in the DBA_MVIEW_LOGS for the customer table.
Please suggest.Hello
Which version of the database, you are on?
And you have access to the Oracle Metalink/My Support?Found this, by the way:
ORA-12096: error in materialized view log
If problems occur when you try to access a log of a materialized view, the system issues an error ORA-12096 which is followed by the actual error. If the error ORA-12096 is accompanied by a message ORA-00942, the problem may be due to a reorganization in line which was only partially cancelled. In this case, you can remove the log file for manually materialized view (after checking that it is no longer necessary):
DROP NEWSPAPER MATERIALIZED VIEWS
;
Published by: hoek on July 29, 2009 14:15
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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%';
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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
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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:
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> are there questions that we should be aware of when the displacement of these materialized view logs with either scenario?
No problem
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Hello
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http://www.Oracle.com/technetwork/developer-tools/Eclipse/downloads/index.html
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REDA
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create materialized view log on the table without a primary key
Hi all
I don't want to refresh the mview when validation is performed on the base table.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
And I don't want to change the base table by adding a primary key.
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NaamaNaamas 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.
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Bug: Cannot create materialized view log on XE 11 G
Hello
I connect as try and HR user create materialized view log
I get the errorCREATE MATERIALIZED VIEW LOG ON HR.EMPLOYEES;
>
Error from the 1 in the command line:
CREATE LOG VIEW MATERIALIZED ON HUMAN RESOURCES. EMPLOYEES
Error in the command line: 1 column: 0
Error report:
SQL error: ORA-00439: feature not enabled not: Advanced replication
00439 00000 - "function not enabled: %s."
* Cause: The specified feature is not enabled.
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>
You can create a materialized view log on 10G XE with no problems.
Kind regards
Jari
http://dbswh.webhop.NET/dbswh/f?p=blog:Home:0Is this a bug in 11g or 10g?
It was reported earlier in the beta forum now archived. {: identifier of the thread = 2214092}
The current doc lists the MV sites only (and 'No' to the function of replication advanced):
http://download.Oracle.com/docs/CD/E17781_01/license.112/e18068/TOC.htm#BABDFDAI -
The materialized view log and user...
Hello
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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?
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SIMThe documentation says the following:
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HTH!
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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.
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Maybe it's a simple question, but I was unable to find an answer very clear in the literature.
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Chris Mills
Biotechnology data management consultantThere 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.
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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:
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ORA-00942: table or view does not exist
I wanted to create Materialized view as below
create a materialized view
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........
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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.
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Materialized view log table to clear
Hello
RDBMS: oracle 10.2.0.2
I created the materialized with fast refresh view.
Now as time passed, Mview journal tables grow much and more.
I want to know, is it possible to shrink the Mview journal tables?
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Terranovaread this link
http://download.oracle.com/docs/cd/B19306_01/server.102/b14227/rarmanmv.htm#sthref708
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Generate the ddl to create materialized view log...
Hi gurus...
Oracle db: 11g
I am trying to generate / excerpt from script MVIEW Logs from prod to be applied on the test.
I tried
< code >
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from dba_objects
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< code >
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Thank you>
Oracle db: 11gI am trying to generate / excerpt from script MVIEW Logs from prod to be applied on the test.
I tried
dbms_metadata.get_ddl(decode(object_type,'materialized_view_log'), object_name, owner)
from dba_objects
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>
Please try to use the tags in code, but you need to add.on the line before and the line after your code instead of what you are using. The object type names are case-sensitive so you need to use
DBMS_METADATA. GET_DDL ('MATERIALIZED_VIEW_LOG', object_name, owner)
Why are you using DECODE?
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MATERIALIZED view log PPUR$ _
Hello all;
1. What is the purpose of PPUR$ _ ?
Vs Mview unique Collection of Mview -when you perform a complete refresh
-are all records deleted or truncated? -That one is true for both cases?
Thank you...Case 1 (default) remove
DBMS_MVIEW EXEC. REFRESH (LIST-ONLINE 'MV123' METHOD-ONLINE "C", ATOMIC_REFRESH => TRUE);
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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...
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is this allowed? materialized view the log for the remote database (via db lin
: Hi guys.
try to do
create materialized view log on user@xxx with sequence, rowid (col1, col2), including the new values;
where xxx is a remote db link
------
had this error
ORA-00949 - illegal reference to the remote database
Google but do not know whelther this error is an internal error or not allowed for mviews characteristic.
help pleaase!
Rgds,
Noobdo you mean that the materialized log should be created in the same location where the main table
YES. Of course, it must be there! Any update to the main table should also update the MV log that is created against it!
Hemant K Collette
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