Materialized View On Nested Table?
Dec 2, 2010
I try to do this:
CREATE MATERIALIZED VIEW MV_NESTED_DATA
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD IMMEDIATE
USING NO INDEX
REFRESH COMPLETE
ON DEMAND
START WITH ROUND(SYSDATE)
NEXT ROUND(SYSDATE) + 1
WITH ROWID
AS
select NESTED_TABLE_FIELD from MY_TABLE@Y_DB_LINK;
where NESTED_TABLE_FIELD is a nested table stored as T_NESTED_TABLE
And I get the error: ORA-12014: table 'T_NESTED_TABLE' does not contain a primary key constraint
Why should it if I try to create a MV with "WITH ROWID" refresh option and not "WITH PRIMARY KEY" one?
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May 17, 2012
I have a question about nested materialized view.
Firstly, I have created 3 mv log on 3 table(target,target extension,brand). Secondly, I created the first mv and its log.
Lastly, I created the second mv from the first mv. This time I used the pivot function, but it cannot work now.
--1 create mv log
drop MATERIALIZED VIEW LOG ON target;
drop MATERIALIZED VIEW LOG ON targetextension;
drop MATERIALIZED VIEW LOG ON brand;
CREATE MATERIALIZED VIEW LOG ON target with rowid, sequence(id);
CREATE MATERIALIZED VIEW LOG ON targetextension with rowid, sequence(targetid,brandid,EmailPermission,NumberOfAllOrders);
CREATE MATERIALIZED VIEW LOG ON brand with rowid, sequence(brandid, brandname);
--2 create the first mv and it's log
drop MATERIALIZED VIEW mv_target1;
CREATE MATERIALIZED VIEW mv_target1
REFRESH FAST START WITH SYSDATE
NEXT SYSDATE + 1/1440
AS
select t1.rowid t1_rowid, t2.rowid t2_rowid, t3.rowid t3_rowid,
t1.id targetid,
t3.brandname,
[code].....
--3 create the second mv
drop MATERIALIZED VIEW mv_target2;
CREATE MATERIALIZED VIEW mv_target2
REFRESH FAST START WITH SYSDATE
NEXT SYSDATE + 1/1440
AS
select * from mv_target1
pivot(max(EmailPermission) EmailPermission, max(NumberOfAllOrders) NumberOfAllOrders for brandName in ('XXX' XXX,'YYY' YYY ,'ZZZ' ZZZ));
Now, Here is a problem, it throws "ORA-12015: cannot create a fast refresh materialized view from a complex query". Then I used dbms_mview.explain_mview to see the reason, and it tell me the following
REFRESH_FAST_AFTER_INSERT "inline view or subquery in FROM list not supported for this type MV"
declare
lv_sqltext varchar2(4000);
begin
execute immediate 'truncate table mv_capabilities_table';
lv_sqltext := 'select * from mv_target1
pivot(max(EmailPermission) EmailPermission, max(NumberOfAllOrders) NumberOfAllOrders for brandName in (''XXX'' XXX,''YYY'' YYY ,''ZZZ'' ZZZ))';
dbms_mview.explain_mview(lv_sqltext,'nested=>TRUE');
commit;
end;
/
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May 2, 2012
I have a materialized view "pro_mview",I am trying to refresh the MVIEW by using the following statement.
EXEC DBMS_MVIEW.REFRESH('pro_mview','C');
But I am getting the below error.
*
Error at line 1:
ORA-12008: error in materialized view refresh path
ORA-00942: table or view does not exist
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2256
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2462
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 2431
ORA-06512: at line 1
I am able to fetch the data from that materialized view(pro_mview).
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Jul 19, 2010
There is a requirement to make a table data in a database (eg: HR database) available in another database (eg: EMP database), instead of accessing it using database link. In EMP database(where data needs to be cloned), data will only be queried and no write operation will be done. Data in remote database (eg: HR DATABASE) will be occassionally fully truncated and reinserted. The plan is to do a similar truncate and reinsert of data (from HR database) into EMP database monthly once using dbms scheduler job. So basically data in just one table needs to be cloned in another database.
Question: For this situation, is a regular table or Materialized view the right choice to clone the table in EMP database and why? The table in HR database (remote database) is not very big.
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Aug 6, 2010
DB1: Sql Server
DB2: Oracle 11g
Is it possible to create a MV log against table@DB1? If not, then am I limited to refresh complete if I need to create MVs against @DB1?
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Aug 18, 2010
We are in the process of migrating our databases to a hosting provider (10g Sun -> 11g LINUX.) A (former) data architect at our business had this (nightmare) situation implemented:
- have materialized views created
- after creation of mat views(and associated tables), add additional audit columns to the table that are populated by triggers, not by the MV. All data is important.
In order to get all of the data to the hosting provider, we data pump export the full schemas (which include the associated MV tables), have the provider DBA's import (all the materialized views failed on import, but the associated MV tables were created/populated), and I'm now attempting to fix the MV code to get them recreated. Over 100 MV's, most of which have these extra audit columns, and a number of the remote master/source tables do not have primary keys so using the by rowid option. An edited example (object names changed to protect the innocent) - using CAST to include the audit columns:
CREATE MATERIALIZED VIEW SCHEMA1.ACCOUNT
ON PREBUILT TABLE
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 512K NEXT 512K PCTINCREASE 0 BUFFER_POOL DEFAULT) TABLESPACE S_TS_01_INDX
REFRESH FAST
ON DEMAND
WITH ROWID USING DEFAULT LOCAL ROLLBACK SEGMENT DISABLE QUERY REWRITE
AS SELECT
ACCOUNT.GROUP_ID GROUP_ID
...
...
cast(null as date) CREATE_PROCESS_DATE,
cast(null as varchar2(20 CHAR)) CREATE_PROCESS_ID
FROM SCHEMA2.ACCOUNT@REMINSTANCE.WORLD ACCOUNT
/
ORA-12058: materialized view cannot use prebuilt table
IF remove "with rowid", get error that cannot create because no primary key on source table.
Online options seem to be (1) do not use prebuilt table (in which case we'd lose the additional audit data) or (2) add a primary key on the master table (we're not in a timeline to make & test changes to various production source tables.)
Other thoughts on how to get this data migrated/populated? This needs to be a lift and drop as much as possible - any type of rewrite/restructuring is out of the question.
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May 16, 2012
how to create materialized view on partition table?
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Aug 28, 2013
we are trying to create a materialized view (MV) which would access the remote database through db link. Now we need to do update on the local MV so that it should be reflected on the master table.
There is no primary key on this table and we are using "complete refresh" option. since we dont have control over remote database, we are not allowed to create MV log over there.
in this scenario, if i try to create updatetable MV with complete refresh, we are getting below error:
SQL Error: ORA-12013: updatable materialized views must be simple enough to do fast refresh
how to create such MV on this scenario?
our environment is:
Oracle 11.2.0.3
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Mar 6, 2013
I have a view that includes sub queries in its select.
I am creating a MV over that view. and i want to fast refresh it when ever a commit is placed on the table (that is used in the from clause for the simple view)
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Sep 12, 2013
I am using sqlplus. example to update a base table using a updatable materialized view.
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Jan 17, 2013
can we change the existing materialized view to normal view? if yes how?
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Mar 25, 2009
Suppose I have materialized view A,B,C. Now I have a new materialized view D which is created from A,B,C. Can I put D into same refresh group?
I am not sure whether D will be refreshed first before A,B,C, resulting that D do not get any update If that is the case, the result will be wrong
If we cannot use refresh group to update nested materialized view, what should we do?
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Dec 11, 2012
I'm trying to create a Materialized View on a remote database from a simple view. The reason is, the data owners don't want to grant explicit tables privileges to external subscribers.
A new schema is created to publish data in the form of a view. I've created mlogs on the master tables, and granted them to the subscriber, but it's still complaining about a missing primary key on the view. A primary key does exist in the master table.
Is there another work around for this situation without having to work inside the data sources' environment?
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Oct 17, 2013
I am using 11.2 DB. I have created 2 object types. The contact_t has been embedded into the student_t object and I have created a view with the nested object.How do you select the values from the contact_t object type in SQL from the view? i want to see the values of the contact_t object in speerate fields (ie. contact_name, city, state...)
CREATE OR REPLACE TYPE contact_t AS OBJECT ( dcid NUMBER(10), contact_name VARCHAR2(50), city VARCHAR2(50), state VARCHAR2(10), zip VARCHAR2(10), email VARCHAR2(100) )
CREATE OR REPLACE
[Code]....
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Apr 26, 2011
difference between view and materialized view?
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Aug 12, 2013
what would be the difference between a view and a materialized view? whether DML possible on a view? i think error occurs if DML tried on a view which is a combination of two or more tables, whether DML possible on a materialized view?
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Jul 7, 2010
I have requirement to create materialized views. The design states to use Complete refresh. Now I am using WITH ROW_ID clause.
1. Question - what are the criteria to decide between WITH PRIMARY KEY & WITH ROW_ID clauses? I referred oracle doc, but couldn't exactly get this.
2. Background - The oracle doc mentions that - Primary key materialized views are the default type of materialized view. The master table must contain an enabled primary key constraint, and the defining query of the materialized view must specify all of the primary key columns directly.
Question - I saw some existing materialized views in my project using WITH PRIMARY KEY clause, but all of the primary key columns are not part of the Select query, but still these views are working fine, how is this possible?
3. Background - The oracle doc mentions that - Rowid materialized views must be based on a single table and cannot contain any of the following:
■Distinct or aggregate functions
■GROUP BY or CONNECT BY clauses
■Subqueries
■Joins
■Set operations
Question - But I have created a Rowid materialized view selecting data from more than one table & defining query involving outer joins. This materialized view got created & getting refreshed (complete refresh). But again this is contradicting with Oracle' statement.
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Feb 7, 2013
There are 2 databases, database A and database B. Database A is Oracle 11.2.0.2 which runs on linux and Database B is Oracle 11.2.0.2 which runs on windows xp machine. In database A, there are 100's of tables which are being updated every 10 minutes or 15 minutes. For reporting purpose, the developer wants to run report for the tables. But since database A is being updated every now and then, generating reports takes almost 15 to 20 minutes. So the reports can be generated in Database B. Once in a day the database B should have the updated data from database A so that the reports can be generated in database B with less time. What could be the best solution for the database B to have the updated data on daily basis from database A in oracle?
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Jul 14, 2011
i have created FAST refresh materialized view.it is eligible for FAST refresh because when i executed SELECT * FROM USER_MVIEWS i could see FAST_REFRESHABLE=DIRLOAD_DML and STALENESS=STALE and it is not getting refreshed(through DBA_JOBS). Why it is in STALE status and how to resolve it. and one of my materialized views is in NEEDS_COMPILE status
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Sep 10, 2010
A scheduler job is there to refresh some materialized views. All the views are run under single job name. Some mviews are not refreshing and those are not refreshing in the next run too.if we run those mviews manually then they are working fine from then . after some days those views which i told before are not refreshing and this happens frequently and i check the job_run_details views also and i am not seeing any errors in that.
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Dec 11, 2008
I need redefine a Materialized View (add some columns). I try it with:
drop materialized view TCPIP preserve table;
ALTER TABLE TCPIP ADD (SUM_IP_OUT_OF_SEQ NUMBER)
/
ALTER TABLE TCPIP ADD (SUM_IP_OUT_OF_SEQ NUMBER)
/
and than create a new MV:
CREATE MATERIALIZED VIEW TCPIP
ON PREBUILT TABLE USING NO INDEX NEVER REFRESH ENABLE QUERY REWRITE as
SELECT ...
But with Oracle error: ORA-12060: shape of prebuilt table does not match definition query
I check the new MV definition, it is contain the 2 added columns.
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Mar 16, 2011
Why we can create indexes only on materialized view and not on normal views?
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Sep 9, 2010
Can u explain the syntax of materialized view??????
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Oct 20, 2010
How can we find how much space is used by the materialized view.
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Jul 5, 2011
I have created a Materialized View (MV) and within the MV DDL have included a statement as per below. However, the MV does not seem to be refreshing on a daily basis. I can see the job in dba_jobs table. So the question, is there some system setting i need to execute or create in order for Oracle to know that it needs to run the Job defined in the dba_jobs table on a daily Basis?
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Oct 26, 2012
I have created materialized view which hold few million records.Should i have to analyze the view and compute the statistics after i create the materialized view?
Also, just in case i need further indexing, should i have to take the statistics for the table again?
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Jun 15, 2013
I am running into an issue and trying to ascertain issue. Scenario:I have 2 MV creation scripts. The MV is supposed to get populated by connection from schema to another schema USING DB Links.Basically, SAME HOST, SAME RAC DATABASE, just separate schemas. The MV creations are just hanging. I see NO alert log mentions. I ran a SQL trace and yes,
I see: call count cpu elapsed disk query current rows------- ------ -------- ---------- ---------- ---------- ---------- ----------Parse 0 0.00 0.00 0 0 0 0Execute 1011 1.40 73.80 0 0 0 0Fetch 1010 1.08 317.57 0 0 0 1010------- ------ -------- ---------- ---------- ---------- ---------- ----------total 2021 2.49 391.38 0 0 0 1010 Misses in library cache during parse: 0Optimizer mode: ALL_ROWSParsing user id: 109 (recursive depth: 2) Elapsed times include waiting on following events: Event waited on Times Max. Wait Total Waited ---------------------------------------- Waited ---------- ------------ SQL*Net message to dblink 2022 0.00 0.00 SQL*Net message from dblink 2021 0.46 242.58
Understandable, but when I do a selective query, the results come back pretty much within 5 seconds.DB version is 11.2.0.3. Is there a BUG that I should know about?
Here is a snippet:
CREATE MATERIALIZED VIEW "SCHEMA"."MV_NAME_MV" USING INDEX REFRESH COMPLETE ON DEMAND AS (SELECT distinct mapguide_persons(pl.location_code) "FULL_NAME_COSTCENTER",mapguide_jobemp(pl.location_code) "TRUNCNAME_JOB",mapguide_empnum(pl.location_code) "FULLNAME_EMPNUMBER_PHONE",mapguide_english(pl.location_code)
[code]....
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Oct 2, 2012
we have a materialized view (in Oracle 11g), usually this MV we easily drop and recreate it.
But last few days, i am trying to drop a MV, but running a long time but no result and it keeps running. not dropped also.
Bcos, db performance is good since we tried to a view using script, it is fine. Problem seems only with Materialized view.
where and how to check what is the issue?
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Aug 20, 2013
some of MVs become invalid (yes, we did app upgrade over the weekend). I looked on every object reference in the MV, all permissions - can't find anything.I dropped MVs and created them no errors. Status changed to VALID. I decided to re-COMPILE them (because I saw public synonyms for MVs as INVALID). After compilation status changed back to INVALID.Oracle 11.2, Solaris 10.
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May 7, 2010
I have got a materialized view which is created over a dblink as below:
CREATE MATERIALIZED VIEW CRIMEREPORTODSV
TABLESPACE ODS_DATA
BUILD IMMEDIATE REFRESH FAST AS
(SELECT * FROM CRIME_INT@CRISP);
This is all fine and works apart from any changes to the source table (CRIME_INT) isn't reflected unless I perform a refresh. Whereas I want any changes to be reflected straight away. I have had to use a Materialized view in this case as one of the columns in the source table is a CLOB and Oracle won't allow creation of a view with a CLOB field over DBLINK.
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