SQL & PL/SQL :: Change View Definition When Select Is Running On That View
Apr 25, 2012
We wrote one data load process to load GZ files into Database.during process we will change client facing view definitions to backup table so that we can work on base tables.
This view definition changes are related to FROM and WHERE clause (not columns/type). during load process, client/user may connect to current server and accessing these views. My question is what will be the reflection of changing view definition while user is accessing view?
I created a scenario-
STEP1: Created a view-
create or replace view view_01 as
select object_name from dba_objects union all
select object_name from dba_objects union all
select object_name from dba_objects union all
[code]....
View definition is replaced by new definition while select is executing on that view. select returned number of records as per view definition one.
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Aug 20, 2012
[URL]...
I have a quite complex view that selects from approx 10 long tables (approx 4M records each) and build one "customer sentence" pre customer id. I will be always getting just one row from this view, eg. select * from my_view where party_id = XYZ. I'll NEVER EVER select the whole view.
The problem is that running a query:
select * from my_view where party_id = XYZ takes really long time, while putting the party_id = XYZ condition directly into the view executes in 0.0 seconds.
After putting a ORDERED FIRST_ROWS(1) hint into a view the execution plans seems to be the same (or very similar) for both queries. Unfortunately, I can not transfer anything but screenshot from the environmnet - therefore I paste the exec plans as screenshots only - pls follow the link: [URL]...
View DDL:
create or replace view my_view as
select /*+ ORDERED FIRST_ROWS(1) */ pt.party_id
pt.party_id as id_klienta_mdm,
pt.master_reference_no as id_klienta_ref_mdm,
[code]...
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Jan 17, 2013
can we change the existing materialized view to normal view? if yes how?
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Nov 28, 2012
I have a view in schema 'sales', let say the view name is view_test.
This view sales.view_test uses two base tables, one from schema 'products' and other from its own schema 'sales'.
So in sales schema the view defination is,
create or replace view view_test
as
select * from t_test, products.t_products
where t_test.id=t_products.id
The view got created, I have granted select permisson with grant option on tables t_test, products.t_products and view_test to another user 'master'.But when i query the view from master schema I get an error saying that the view does not exists, upon analysis, I found one of the base table in the view defination has no schema name mentioned (select * from t_test, products.t_products --here only t_test mentioned rather sales.t_test), I feel because the table t_test belongs to the same schmea of the view, they did not mention the schema name. If not, does it mean that we need to always specify the schema names in the view defination for the base tables.
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Sep 7, 2012
How can I determine what views have a dblink hard coded in them? I am talking about a large number of views so bringing up each view's DDL in a GUI data dictionary tool to look is not an option. I tried running the query below unfortunately "text" is a LONG and doesn't allow the use of the "like" statement.
select * from dba_views where text like '%@%' ;
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May 20, 2013
How to retrieve a view definition to re-create it somewhere when its size is more than 32767 bytes?Here are some constraints :
- We are in Oracle 9.2.0.8, meaning that we cannot use the DBMS_METADATA package.
- We cannot concatenate char and long : things like
set long 100000
select 'create or replace view my_view as ' || text from dba_views where view_name = 'MY_VIEW';
are not possible.
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Feb 22, 2013
I created a view for emp1 table.
SQL> select view_name , text from dba_views where VIEW_NAME='EMP1_VIEW';
VIEW_NAME TEXT
EMP1_VEW select empid , ename , qual, dept from emp1
where empid between 1000 and 1010
Now i tried to use create or replace option
SQL>create or replace view emp1_view as
*2 select * from emp1_view with read only;*
create or replace view emp1_view as
*+
ERROR at line 1:
ORA-01731: circular view definition encountered
Actually i want to make read only view (emp1_view) ; without doping ;
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May 11, 2010
I have a view in schemaA called viewA for example. The view is quite complex, with multiple joins.I've granted ALL to schemaB to the view, and to all the referenced tables within the view.However, when I run execute the view from schemaB, I get a ORA-00942 table or view does not exist.
SQL> select * from schemaA.viewA;
select * from schemaA.viewA
*
ERROR at line 1: ORA-00942: table or view does not exist
I suspect that Oracle is creating to temporary tables/views internally (or using something that is already there), and that I need to grant access to these temporary objects.
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Nov 23, 2011
An user is running some queries and that's making database hang. I want to view what queries this user is running. Can this be done by session auditing turning on?
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Jan 31, 2013
I have big source tables to load in a data warehouse. We are in a full Oracle environment. So I need to extract only delta since the last extract.
I need to capture even deleted rows from the source table.
I have tested the following solution:
- declare a materialized view log on the source table
- load the content on this view log in my ODS
- empty this view log
- load my DWH with the captured delta
It is very simple and seems to work perfectly. I am just confused by the fact that nobody seems to have implemented such a solution.
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Dec 7, 2006
I am using some UPS shipping software that imports shipping information based on an order number that the user enters and we are having performance problems. In the software's configuration you choose one database object (namely a table or view) to get the information from. I have created myView that selects from multiple tables, lookup tables, etc. I must use a view because the software only has the ability to add a " and <importKeyThatIHaveDefined> = <valueEnteredByUser>". For instance " and order_number = 123". It cannot join multiple tables, etc. The address_field1 info is the same for each record with the same order_number so I can just get the first row (or any row with order_number = <enteredOrderNumber> for that matter).
When I first looked at this it was created as something like this:
select order_number, line_number, order_number || '' || line_number as ol, address_field1 from order;Keep in mind that there are more than just this table and more fields selected. They are all joined correctly (for lookup values etc.).
The concatenation was determined to be the bottleneck in performance. ol was defined as the import key to be used and the users were just entering the order number plus a 1 to get ONLY the first line number. Each order (usually) has more than one line and even the line number is not necessarily unique for each order. For instance, order 123 may have line 1 twice and line 2 once.
select order_number, line_number, address_field1 from order where rownum = 1;
The software appended the " and order_number = 123" as expected but because rownum = 1 had already been executed (before the and order_number = 123" the view only returned one row even WITHOUT the order_number = 123.
I need to return only ONE row for a given order number EVEN IF there are multiple records with the same order_number and line_number. Using "where order_number = <enteredOrderNumber> and line_number = 1" is not necessarily unique so that won't work.If I can't make it work this way and can't use the rownum = 1 what options do I have?
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Mar 1, 2012
I am using Oracle Database 9i. I have created a view as follows:
CREATE OR REPLACE FORCE VIEW ipl.abc_test AS
SELECT '10' dsgn, TRIM (b.oc1) code, b.grp, b.POLICY, b.premcode,
b.receipt, b.recptdt, b.PLAN, b.term, b.paymode, b.sumass, b.datcom,b.duedt, b.instl, b.lprem, b.rprem, b.sprem, b.extprem, b.totprem,b.oc10, b.oc9, b.oc8, b.oc7, b.oc6, b.oc5, b.oc4, b.oc3, b.oc2,b.oc1, b.bill_oc1 billno, a.fprdate riskdt,
NVL (a.bmon, TO_CHAR (a.fprdate, 'YYYYMM')) bmon, a.entryopt,
a.extprem3 suplext
[Code]...
View created properly, But when i select from this view this giving message missing right parenthesis. For information the select statement of the view gives multiple rows. Where is the problem.
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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 8, 2010
is it possible to create primary key on view and use this view for creating foreign key .
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Jun 7, 2011
I have been out of work for 2+ years. Am about to start a job next week doing Oracle back end, Forms, and Reports development among other things. I was asked if I could take a look at 3 report requirements and give an estimate on how long it would take to correct errors in these reports. All I have is a user requirement document stating what the report is currently doing and what it should be doing, a partial screen print of an Oracle Form showing correct data, and a sample report page showing incorrect data.
I am finding it rather difficult to give an estimate without seeing tables, relations, code, etc. Is it me or does this seem nearly impossible?I do not have access to their system yet so cannot view the database or run select statements, run the report, etc. All I have are the documents I listed above.
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Apr 8, 2012
1. I Wnat to analyze the buffer cache hit ratio. This is what i did.
DECLARE
bufcac NUMBER(10, 2);
BEGIN
[Code]....
2. I would like to analyze the PGA and determine what percentage out of the maximum allocated PGA is being used. I tried the code below but can't find the percentage. Sad
SELECT NAME,
To_char(Decode(unit, 'bytes', VALUE / ( 1024 * 1024 ),
VALUE), '999,999,999.9') VALUE,
[Code]....
Apart from the little problem I have with number 2, not figuring out how to get the precentage seeing that all the data is store in the field VALUE.
I would also like to create a view that has both 1 and 2 in it, but whenever I try creating it, I got and error stating and INTO clause is expected.
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Jun 11, 2012
I'm trying to create a view that includes both custom and delivered tables. The SQL code produces the desired results in SQL Developer. However, when I create and test the view using that code, I get very different and incorrect results. The SQL part of the view is below:
SELECT j.emplid, pt.deptid, pt.y_policy_id, pt.effdt, pt.title, pt.comments, pt.y_policy_covg, pt.doc_url
FROM psoprdefn a
, ps_job j
, ps_y_policy_tbl pt
WHERE substr(a.oprid,1,1) = '0'
AND a.emplid = j.emplid
AND j.job_indicator = 'P'
AND j.effdt = (SELECT MAX(effdt) FROM ps_job
WHERE emplid = j.emplid AND empl_rcd = j.empl_rcd AND effdt <= sysdate)
[code]....
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Dec 23, 2010
I have a view, below, which does few left outer joins to the same V_MARKET view to get data i need. When I run SQL by itself, ut runs pretty fast, 2-5 seconds. But when I do "select * from V_DEPT_DATA where busines_date = '01-APR-10'", it takes more than 10 minutes to run. I added all needed indexes and still have problems with it .
CREATE OR REPLACE VIEW V_DEPT_DATA
AS
SELECT
v1.business_date ,
v1.division ,
v1.department ,
v1.account ,
en.trader ,
[code]........
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Aug 16, 2013
I created a user and granted connect, resource to the user. but trying to select columns from the view USER_HISTORY$,it's showing no value, i tried to login the user several times, but it's displaying no value, any particular reason or any minor mistake?
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Oct 27, 2011
My need is to grant priveleges for select on view without granting on nested tables.
Actual problem is that I can grant privileges for particular user, but can't grant privileges for user group.
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Jun 13, 2010
currently i m going through some dumps for my OCA-11g prep.I came across one sentence :A view cannot have an ORDER BY clause in the SELECT statement.well this statement is false and the explanation given was :
Query operations containing ORDER BY clause are also permitted, so long as the ORDER BY clause appears outside the parentheses.
The following is an example of what I mean: CREATE VIEW my_view AS (SELECT*FROM emp) ORDER BYempno.
but when i tried running the query like this :CREATE VIEW my_view AS SELECT*FROM emp ORDER BYempno ,it worked w/o giving parentheses.
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Aug 31, 2012
Need a trigger in view with select statement that means
CREATE OR REPLACE VIEW TEST_VIEW AS SELECT * FROM TEST_TABLE;
CREATE OR REPLACE TRIGGER TEST_VIEW_TRG1
INSTEAD OF DELETE ON TEST_VIEW DECLARE
BEGIN
Dbms_Output.Put_Line('STATEMENT TRIGGER.');
END;
i wanted to use select statement instead of delete.How can i get that
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Jul 28, 2010
Are oracle view have Dynamic view function?
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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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May 28, 2012
I need to view the rows of the result of a select query in table format in GUI application.I have used XMLELEMENT to somewhat match the scenario to display as ','(comma) separate values as b belwo
SELECT RTRIM (XMLAGG (XMLELEMENT (e, EMPNO || ',')).EXTRACT ('//text()'),
',')
AS empid,
RTRIM (XMLAGG (XMLELEMENT (e, ENAME || ',')).EXTRACT ('//text()'),
[code]...
But the case is I need to display the value in table format Horizontally as below
EMPIDemployee nameDEPID
778
278CLARK10
397MILLER
934KING
[code]...
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Jun 20, 2011
I have a materialized view (smpl_mview) if i want to see the SELECT statement written for the materialized view, how can i see/retrive select stmt?
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Jul 24, 2011
I'm using Oracle 9i Enterprise edition, Is there a select statement to view transaction log for specific date?
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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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Dec 1, 2011
Can we create view in another view
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