Materialized view: when to use a full refresh

Thank you in advance, I read in the book of the Oracle University - "a complete refresh of a materialized view is to truncate the existing data and reinsert all data based on detail tables, re-running the query definition to CREATE order. Quick updates apply only changes since the last update. My question is what we need to complete refresh because the data in the table created for the two methods are ultimately the same and fast refresh is more "quickly"?

Well, I don't know about the Oracle University book, but Oracle manual list a long list of restrictions when fast updating is not possible. I hope that answers your question.

SY.

Tags: Database

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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 =.
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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.

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I have 2 questions:
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fast refresh on MATERIALIZED VIEW
Oracle 10 g R2 (10.2.0.5)

Scott.mv_test CREATE MATERIALIZED VIEW
Users TABLESPACE
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
IMMEDIATE CONSTRUCTION
REFRESH THE STRENGTH TO DEMAND
WITH THE PRIMARY KEY
AS
Select...

I this MV, when I do the QUICK refersh as follows, I get the error message

SQL > execute DBMS_MVIEW. REFRESH ('MV_TEST', 'f');
DBMS_MVIEW BEGIN. REFRESH ('MV_TEST', 'f'); END;

*
ERROR on line 1:
ORA-12004: QUICK COOLING can be used to view materialized "SCOTT." "" MV_TEST ".
ORA-06512: at "SYS." DBMS_SNAPSHOT", line 2251
ORA-06512: at "SYS." DBMS_SNAPSHOT", line 2457
ORA-06512: at "SYS." DBMS_SNAPSHOT", line 2426
ORA-06512: at line 1

But it works with full refresh.

Is this planned, any help would be appreciated.

Thank you
```
ORA-12004: REFRESH FAST cannot be used for materialized view "string"."string"
Cause:      The materialized view log does not exist or cannot be used. PCT refresh is also not enabled on the materialized view
Action:      Use just REFRESH, which will reinstantiate the entire table. If a materialized view log exists and the form of the materialized view allows the use of a materialized view log or PCT refresh is possible after a given set of changes, REFRESH FAST will be available starting the next time the materialized view is refreshed.
```
http://ORA-12004.ora-code.com/

'Invalid metadata objects' when creating materialized views

Hi experts,

I ran into some trouble. I had an analytic workspace that has grown too quickly (see 11.2.0.2 size AW grows regularly with each generation of cube so I deleted and created a new.)

He seemed to do very well with the tip David Greenfield, gave us in the mentioned forum post, but when I try to activate materialized views (that I had activated in the previous workspace) I am gettig the following error:

-----
Your metadata changes have been saved, with the following errors
Invalid metadata objects:
Invalid object "TABLESPACE. LECTURAS': 'CREATE A MATERIALIZED VIEW 'TABLESPACE' '. "CB$ LECTURAS.
ORGANIZATION OF CUBE ON THE TABLESPACE. () TABLESPACE_AW
MADE "LECTURAS_STORED"("LECTURAS_MEASURE_DIM" "LECTURA") IS "LECTURA"
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DIMENSION 'GEOGRAPHY' IS 'GEOGRAPHY' WITH THE HELP OF 'GEOGRAFIA_GEOGRAFIA_CONTADOR_ID_UNIQUE_KEY')
POSTPONED BUILD
UPDATE ON REQUEST
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WITH THE HELP OF CONSTRAINTS OF TRUST
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T1. "" COD_METERID ""GEOGRAPHY. "
SUM (T1." VAL_AI_HOR') "LECTURA".
Of
TABLESPACE. "' LECTURA_HORARIA_FINAL ' T1
GROUP BY
(TO_CHAR (T1." (FEC_LECTURA"," hh24:mi:ss dd/mm/yyyy '), T1. ("' COD_METERID")
)
ORA-00942: table or view does not exist
"
-----

This same script running in SQLDeveloper gives the same error in line 17, which is the FROM clause. BUT I can run the select by itself and returns the expected result. If the table exists in the correct storage space.

I must be missing something big...

Thanks in advance.

Joan

P.S.: In the above code I use 'SPACE' to replace the real name from username and a tablespace (which is the same) for reasons of confidentiality.

When you run the select statement, you connect to the same user you are trying to activate the VM?

You can create a standard (No cube) MV with the same select statement? (Connected to the same user that you used in AWM).

"CREATE MATERIALIZED VIEW "TABLESPACE"."MV_TEST"
  BUILD DEFERRED
  REFRESH ON DEMAND
  FORCE
  USING TRUSTED CONSTRAINTS
AS
(
  SELECT
   TO_CHAR(T1."FEC_LECTURA", 'dd/mm/yyyy hh24:mi:ss') "TIEMPO",
   T1."COD_METERID" "GEOGRAFIA",
   SUM(T1."VAL_AI_HOR") "LECTURA"
  FROM
   TABLESPACE."LECTURA_HORARIA_FINAL" T1
  GROUP BY
   (TO_CHAR(T1."FEC_LECTURA", 'dd/mm/yyyy hh24:mi:ss') , T1."COD_METERID")
)
{code}

Fast refresh materialized view problems
I have two databases (A and B).

In A database, user NICK has a table called COLOUR_MASTER.
Also in this database, NICK issues creating materialized command newspaper view colour_master with the primary key, including the new values (and Yes, there is a primary key defined for this table)
In database B, there is a link of database called A_LINK, connect, Nick, identified by password using 'dbA ';
In database B, user IAN also creates a materialized view CM_MV cool off quickly in select * from colour_master@A_LINK

This statement is done correctly, and there are several million lines in CM_MV when it's done.

Immediately, IAN issued this command:

Start
dbms_mview. Refresh ('CM_MV');
end;

.. .and after a small pause, it gets the error

ORA-12008: error path refresh materialized view
ORA-02068: following sever error of A_LINK
ORA-03113: end of file on communication channel

One more + "select count (*) of colour_master@A_LINK" + subject immediately manages to return the correct number of records in the database so A 3113 is a bit misleading, I think that, in this case have crash, the database remains accessible at all times, there is no network problem (database A and B are both located in the same server so it of not like I'm trying of) connect to halfway around the globe).

The only thing I can think is that there is a permissions issue causes this error. The creation of MV because is made via a link, it is not a problem of IAN see all appropriate, but once the updates come into play, it is perhaps.

Any who can shed light on why I can't do the fast refresh from the view, I can create joyfully, please?
I'm surprised no one asked you to do what is obvious: try to do a select * from colour_master@A_LINK, without that being wrapped in a create materialized MATERIALIZED view. Just do a simple select * from...

My bet is that you will get an error ORA_22992 can not use selected from the remote tables LOB Locators . And if you can't do a simple select * in a remote table, I suspect that you can reasonably expect Fireworks when you try to create or refresh a view materialized on such a thing!

Here's a quick test:

In the 1 database:
=========
```
SQL> create table A (col1 varchar2(2), col2 clob);
Table created.

SQL> alter table A add constraint A1 primary key (col1);
Table altered.

SQL> insert into A values ('AA','This is an entry into a clob column');
1 row created.

SQL> commit;
Commit complete.

SQL> create materialized view log on A with primary key including new values;
Materialized view log created.
```
In the database 2
=========
```
SQL> connect ims_global/v0yager1@ussd
Connected.

SQL> create materialized view B refresh fast as
  2  select * from A@remotedb_link;

Materialized view created.

SQL> exec dbms_mview.refresh('B');
BEGIN dbms_mview.refresh('B'); END;

*
ERROR at line 1:
ORA-12008: error in materialized view refresh path
ORA-02068: following severe error from REMOTEDB_LINK
ORA-03113: end-of-file on communication channel
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2251
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2457
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2426
ORA-06512: at line 1

SQL> drop materialized view B;
Materialized view dropped.

SQL> create materialized view B refresh fast as
  2  select col1 from A@ims_link;

Materialized view created.

SQL> exec dbms_mview.refresh('B');
PL/SQL procedure successfully completed.
```
Which seems to reproduce your problem rather well, I think.

I don't know if there is no work around for this. I mean, obviously you can't miss the CLOB column in your statement of 'create a MV' as I just did, but I don't know if you're still allowed or expected to be able to create a MV on lob columns and that such and such correction will allow you to do. Maybe someone else can provide this information.

But at least you won't have to play Russian roulette with your init.ora parameters!

Do not to use the materialized view

I wonder if we've already created a materialized view, can we prefer not to use this point of view, materialized for a query? I want to say can we determine if a query uses MV and other queries don't use MV? Thank you.

Hello Indra,

I'm not completely sure about that, but you can read (with examples) concerning the indications- NO_REWRITE and REWRITE

Text over the doc links:

Council of REWRITING:

The REWRITE Council instructs the optimizer to rewrite a query regarding the materialized views when possible, regardless of cost. Use the REWRITE trick with or without a display list. If you use REWRITE with a view list and the list contains an eligible materialized view, then Oracle uses this view regardless of its cost.

Tip NO_REWRITE:

The NO_REWRITE Council tells the optimizer to disable the rewrite of the query to the query block, of the substitution of the definition of the parameter QUERY_REWRITE_ENABLED .

Be aware! -The NOREWRITE suspicion has been deprecated. Use the NO_REWRITE hint instead.

Read here: setting QUERY_REWRITE_ENABLED

-Nordine

Materialized view conducive to fast refresh method
In AWM when I select refresh FASTER method and select the materialized view, get the error below:
"Quick Refresh method requires the materialized view logs and a complete refresh previously run the MV cube." I need this fast a cube materialized view refresh, so that it performs an incremental refresh and re-aggregation of only the changed lines in the source table.
can someone help me on this?
Remember to choose the 'Force' that runs fast if possible update, as otherwise it performs a complete refresh. You can also specify Complete as the Refresh method in the dialog box Assistant Maintenance first, you keep the cube.

You'll need create materialized on all the base tables, view logs if you have not already done so, otherwise the cube will be able to do a fast refresh (differential).

Materialized view: when to use a full refresh

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Additional Restrictions for master materialized views

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