Can we poll for database view

Can we poll for database view using Datbase Adapter?
Thanks
Vivek.

It is recommended NOT to use triggers, without going into too much detail this link provides a very good examples of why not to use triggers
http://www.oracle.com/technology/oramag/oracle/08-sep/o58asktom.html
The reason the adapter provides functionality for polling is for the very reason of no dependency in the source system.
cheers
James

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Can do explict join for database view?

Hi all,
I would like to ask whether there is a way to specify the join condition to be outer join for database view. It is because I need to map 2 tables in the view and I want to be able to find the record in the view table if the record exists in Table A but not Table B.

Hi Jaya,
A Maintenance View helps you to maintain data that is distributed across different or multiple database tables. So, it becomes an easy way to update data and without any programing effort. You can create a Maintenance View across multiple tables with one Table as Primary Table and others as Secondary Tables. But the tables must be related with each other with a Foreign Key Relationship.
Have a look at the following link which tell you about the procedure of creating the Maintenance Views :
http://help.sap.com/saphelp_nw04s/helpdata/en/cf/21ed2d446011d189700000e8322d00/frameset.htm
Hope this helps.
Thanks,
Samantak.

Maximum setting that can be done for pivot view in instanceconfig.xml.

Hi All,
Can anyone let me know if there is any maximum setting that can be done for pivot view in instanceconfig.xml.
Regards,
Apoorv

Hi,
Our instanceconfig has the following settings..
<PivotView>
<MaxCells> 4000000 </MaxCells>
<MaxVisibleColumns> 5000 </MaxVisibleColumns>
<MaxVisiblePages> 2500 </MaxVisiblePages>
<MaxVisibleRows> 75000 </MaxVisibleRows>
<MaxVisibleSections> 3000 </MaxVisibleSections>
<ResultRowLimit>20000</ResultRowLimit>
</PivotView>
<CubeMaxRecords> 1000000 </CubeMaxRecords>
<CubeMaxPopulatedCells> 1000000 </CubeMaxPopulatedCells>
But is there somekind of documentation or Oracle recommendation on maximum setting for pivot view....
Need it, as it seems even the existing settings are not quite fruitful in fulfilling user requirements.

How to change the Access for Database views

Hello Experts,
My requirement is to copy the records of a standard database view BDCPV (which is a combination of BDCP & BDCPS) to a custom view and then compare the records with a new table BDCP2.
I copied the BDCPV view to a table and used the custom view in the program. While executing the program, I'm getting an error message like "The database view <View Name> is write protected, so it cannot be changed".
I'm unable to change the Access under Maintenance Status Tab from Read only to "Read and Change". Could anyone help me how to resolve this issue".
Also please share teh sample code if you have any for the above requirement. We are using it in a SP upgrade to one of the systems.
Regards,
Rajesh.

Hi,
Change the status in the given way.
Choose Extras ® Maintenance status. A dialog box appears, in which you can select the maintenance status for the view. If more than one table is involved in the view, the maintenance status read only cannot be altered.
Regards,
Srinivas.

Polling for database updates fails to update sequence file/table

I have a small system to poll for changes to a database table of student details. It consists of:
Database adapter, which polls the database for changes, retreives a changed row, and passes the generated XML to -
"receive" router service, which simply passes the retrieved database XML data to -
"execute" router service, which transforms the XML and passes the new message to -
File Adapter, which writes the transformed XML to a file.
The problem is that the database polling is not updating the sequence recorder - I have tried using a sequence file which stores the personnumber, a sequence table which stores the personnumber and a sequence table which stores the last-updated timestamp. In all cases the database adapter successfully reads the sequence file/table and retreives the correct row, based on the sequence value ( I have tested this by manually changing the sequence value), the data is transformed and a correct xml file is created, but the system then fails to update the sequence file/table so that when the next polling time comes around the very same database row is extracted again and again and again.
In the ESB control panel I have one error: "Response payload for operation "receive" is invalid!"
The Trace is:
oracle.tip.esb.server.common.exceptions.BusinessEventRejectionException: Response payload for operation "receive" is invalid! at oracle.tip.esb.server.service.EsbRouterSubscription.processEventResponse(Unknown Source) at oracle.tip.esb.server.service.EsbRouterSubscription.onBusinessEvent(Unknown Source) at oracle.tip.esb.server.dispatch.EventDispatcher.executeSubscription(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.processSubscription(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.processSubscriptions(Unknown Source) at oracle.tip.esb.server.dispatch.EventDispatcher.dispatchRoutingService(Unknown Source) at oracle.tip.esb.server.dispatch.InitialEventDispatcher.dispatch(Unknown Source) at oracle.tip.esb.server.dispatch.BusinessEvent.raise(Unknown Source) at oracle.tip.esb.utils.EventUtils.raiseBusinessEvent(Unknown Source) at oracle.tip.esb.server.service.impl.inadapter.ESBListenerImpl.processMessage(Unknown Source) at oracle.tip.esb.server.service.impl.inadapter.ESBListenerImpl.onMessage(Unknown Source) at oracle.tip.adapter.fw.jca.messageinflow.MessageEndpointImpl.onMessage(MessageEndpointImpl.java:281) at oracle.tip.adapter.db.InboundWork.onMessageImpl(InboundWork.java:1381) at oracle.tip.adapter.db.InboundWork.onMessage(InboundWork.java:1291) at oracle.tip.adapter.db.InboundWork.transactionalUnit(InboundWork.java:1262) at oracle.tip.adapter.db.InboundWork.runOnce(InboundWork.java:501) at oracle.tip.adapter.db.InboundWork.run(InboundWork.java:401) at oracle.tip.adapter.db.inbound.InboundWorkWrapper.run(InboundWorkWrapper.java:43) at oracle.j2ee.connector.work.WorkWrapper.runTargetWork(WorkWrapper.java:242) at oracle.j2ee.connector.work.WorkWrapper.doWork(WorkWrapper.java:215) at oracle.j2ee.connector.work.WorkWrapper.run(WorkWrapper.java:190) at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:819) at java.lang.Thread.run(Thread.java:595)
The payload is:
<PersonCollection xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.oracle.com/pcbpel/adapter/db/top/ISSSimIN">
<Person>
<name>Bob</name>
<surname>Stupid</surname>
<istatus>2</istatus>
<active>Active</active>
<personnumber>3001</personnumber>
<role>Staff</role>
<organization>TEX</organization>
<updateTimestamp>2007-11-29T14:06:55.000+00:00</updateTimestamp>
</Person>
</PersonCollection>
The payload above is the XML output from the Database adapter, the xsd for which was autogenerated by JDeveloper, so I don't understand how it can be invalid.
I have only been working with ESB for 3 days, but half of that time has now been spent stuck on this issue. Anyone got any ideas??
Richard

You need to be careful. Submit and committing to the database are two different things.
Submit on a page (and autoSubmit the property) are only posting the changes you typed into the field, back down to the application server. NOTHING is happening with the database at this point. So the applications's internal "cache" of records (using something like ADF BC) is holding the changes but the database doesn't know anything. So if you quit now, no changes will go to the database.
These changes onlyget submitted down to the app server when you do some sort of action like press a button. Simply navigating fields will be doing nothing back to the app server. If you add autoSubmit then you will automatically submit the changes on that field down to the app server when you leave the field (but again, this is not touching the database)
You have to explicitly add a COMMIT operation to save those changes to the database.
Maybe if you try in a simple EMP example and send us your findings we can help direct you further.
Regards
Grant

SSCR for database view

Dear Guru's,
M_MCH1M = Generated view for matchcode ID MCH1        -M
Actually I want to add some fields in this database view .
So I applied in key values for SSCR.
PgmID Type Object name:
Basis release *       : 700 R3TR
PgmID *       : R3TR
Type *       : VIEW
Object name * : M_MCH1M
But I am not getting the Access key for this object.
Please advice me is there any missing from my end?
Thanks and B/R
Bishnu
04/11

Dear Krishnendu,
Thanks for your advice.
From you first quote:
Help me to find the access key. is there any mistake in my SSCR request fields.
Second:
I need to change in this help view because I am using MIGO.
Please advice me.
Thanks and B/R
Bishnu
06/11

How can I avoid polling for database alerts?

I am implementing a Java package that makes processing alerts from Oracle (the dbms_alert pl/sql package) easier than raw JDBC. This happens inside a servlet. My first problem is that when the servlet container such as tomcat asks the servlet to shutdown, choosing to stop listening for Oracle alerts appears to be impossible without polling Oracle for the alert events.
Specifically, I have a thread that is blocked on a call to dbms_alert.waitany. How can I wake this thread up and have it cleanly shut down? I've tried closing the JDBCConnection in the hopes it would receive a connection-closed exception which my thread could simply ignore if being asked to shut down. But the call to JDBCConnection.close() simply hangs. I've tried a few other tricks to no avail. Documentation I've studied does not discuss the problem at all.
The only "solution" I've found is to pass the dbms_alert.waitany a one-second timeout parameter when waiting for alerts. This makes the thread wake up every second, at which time it will usually just find that the timeout occurred and start waiting again. But this creates an opportunity for it to check an exit flag and terminated itself.
Aside from wasting some CPU cycles this has the serious downside that it results in a remote call to Oracle across the network every second! That will no-doubt aggravate various people in IT as a serious load and I'm not sure how to articulate a good defense.
I'm really hoping that there's some way to wake up my thread without having it wait for a timeout. Otherwise is this not a serious defect?
There are other use cases for my package that are stumped by the same root problem. If I want to register for a new alert, I'd like to wake up my blocked thread, have it make the registration call, then call dbms_alert.waitany again. But this too requires waiting for the thread to wake up based on the timeout and the resulting trade-off between wasting resources and delaying the registration - a trade-off that has no good answer.
Is there any way I can get the call to dbms_alert.waitany to unblock with an error code or exception so this impossible decision becomes irrelevant?
Thanks

>
Specifically, I have a thread that is blocked on a call to dbms_alert.waitany. How can I wake this thread up and have it cleanly shut down?
>
You wake it up the way it is designed to be woken up: signal an alert from another thread.
That thread will 'wake up' when an alert is signaled. So when you want to shutdown set a 'shutdown' variable that the thread checks wheneve it wakes up.
Then use another thread to signal an alert. That alert will wake up your blocked thread, the thread will check the 'shutdown' variable and will take action based on the setting of that variable.
See the examples in the DBMS_ALERT section of the Oracle docs:
http://docs.oracle.com/cd/B28359_01/appdev.111/b28419/d_alert.htm
>
WAITANY Procedure
Call this procedure to wait for an alert to occur for any of the alerts for which the current session is registered.
>
You can register for your own 'JAVA SHUTDOWN' alert in addition to the alert your thread is now registered for. Then use the method I outline above to use the SIGNAL method to generate that 'JAVA SHUTDOWN' alert. That will wake your thread up so it can shut itself down.

MetaData For Database View Columns How ??

SELECT * FROM user_tabs_columns WHERE table_name = 'EMPLOYEES';
The above query will return column information like data_type, lenght etc for the columns in the EMPLOYEE table, how can one retrieve such information on the columns / fields in a view instead of a table. I have views built from several tables, and I use the data returned from quering the views as records displayed to the user in an AJAX application, using the data-grid widget in the said AJAX library. If the user has rights to edit the records, I need to use specific ajax widgets (like a date widget) to edit a field if the datatype information provided by the database is DATE or DATETIME, if the field is nullable, I can permit the user to enter nothing, and I can restrict input length to the lenght of the column. But since the record is spread across several tables and pulled out from a view, I therfore need a way to get the column information on the said view.
How can this be achieved.
Thanks.
Charles Odili.

You should still be able to use the USER_TAB_COLUMNS view to obtain this information. I did a quick test below:
SQL> create view test as select * from all_objects;
View created.
SQL> select table_name,column_name from user_tab_columns where table_name='TEST';
TABLE_NAME                     COLUMN_NAME
TEST                           OWNER
TEST                           OBJECT_NAME
TEST                           SUBOBJECT_NAME
TEST                           OBJECT_ID
TEST                           DATA_OBJECT_ID
TEST                           OBJECT_TYPE
TEST                           CREATED
TEST                           LAST_DDL_TIME
TEST                           TIMESTAMP
TEST                           STATUS
TEST                           TEMPORARY
TEST                           GENERATED
TEST                           SECONDARY
13 rows selected.
SQL> spool off;

Method that can be used for multiple views

Hello,
I've got three tables: Person, Company, Adress. Each Person/Company can have mulitple adresses. So Adress has a foreign key to Person and Company. In ADF BC I've created two views for Adress: PersonAdressView, that has PersonView as Master and CompanyAdressView that has CompanyView as Master. Now I want a copy functionality, that validates and copies a given Adress row. I want this functionality for PersonAdressView and for CompanyAdressView. Is there a possiblity to write generic code that can do this?
The logic that works on CompanyAdressView/CompanyAdressViewRowImpl and on PersonAdressView/PersonAdressViewRowImpl is the same. But the java datatypes are in so many lines different that it is almost impossible to use common code. Is it possible to resolve this problem with common base classes? If it is, I have no idea how to create them.
regards
Jörg

Hi,
create a custom version of ViewObject (extending ViewObjectImpl) and base the two ViewObjects on your custom VO (extend).
Frank

What can i do for creating view on a public synonym?

Hi people,
I have create a public synonym for other users object as,
SQL> create public synonym pdep for scott.dept;
Synonym created.
then i tend to create a view on this public syn as,
SQL> create view vpdep as select * from pdep;
create view vpdep as select * from pdep
ERROR at line 1:
ORA-01031: insufficient privileges
I have privilege to create view.also i can create view on a public synonym of my own objects.for ex,
SQL> create public synonym cdep for dept;
Synonym created.
SQL> create view vcdep as select * from cdep;
View created.
what could be the reason behind this?is there any privilege required for me.pls suggest me.
Regards
VIDS

Hi vidusnat!
This is from Oracle's onlinedocumentation:
>
Privileges Required to Create Views
To create a view, you must meet the following requirements:
You must have been granted one of the following system privileges, either explicitly or through a role:
o The CREATE VIEW system privilege (to create a view in your schema)
o The CREATE ANY VIEW system privilege (to create a view in another user's schema)
You must have been explicitly granted one of the following privileges:
o The SELECT, INSERT, UPDATE, or DELETE object privileges on all base objects underlying the view
o The SELECT ANY TABLE, INSERT ANY TABLE, UPDATE ANY TABLE, or DELETE ANY TABLE system privileges
In addition, in order to grant other users access to your view, you must have received object privileges to the base objects with the GRANT OPTION clause or appropriate system privileges with the ADMIN OPTION clause. If you have not, then grantees cannot access your view.
>
I hope that this will bring a little light into darkness!
Yours sincerely
Florian W.

SQL Developer can be used for database design

can I use SQL Developer to design the database?

It really depends on what you mean by "can," how complex the schema design is going to be, and your comfort level.
AB is quite right to point out Oracle Designer-- that's a very powerful, very visual tool for creating physical and logical schema designs. It also has a relatively steep learning curve and a relatively large installation footprint. If you need to generate highly complex schema designs, to allow multiple modelers to work together, and you will use the tool frequently enough to justify the training time, Designer is a wonderful tool.
On the other end of the spectrum, however, it's perfectly possible to generate a schema design using SQL*Plus or SQL Developer with a white board or scratch paper nearby to help think through various issues. The tools aren't presenting you with pretty ERDs, they're not automatically translating visual representations of designs to physical implementations, etc. but it's quite possible for a human using those tools to do the translation.
Either way will work-- the constraints of your particular project and your comfort level with various risks will determine which approach is more appropriate.
Justin

How to Export/Import specific/selected table columns (can database view be

All,
I like to export and import some selected columns and rows of a table from one oracle database to another database.
For example, I like to export the following SQL's result data to another oracle database.
select ename, sal from emp where dno = 100;
Can I create a database view based on the above SQL and export the view with data (I don't think data will be exported along with database view?)
I know, I can do this either with SQL*Loader or by creating DBLink between databases and using insert-select statement.
Please let me know if this is possible in exp/imp.
Appreciate your help.
Thanks
Kumar

Hello,
You can Query and table option to export and import and i recommend you to create parameter file to use query option
parfile.par
file=myexport.dmp
tables=table1,table2,table3
query="where dno=2"
..Conventional export/import, you can also consider using datapump if you are using 10g.
exp username/password parfile=parfile.par log=myexport.log
imp username/password file=myexport.dmp tables=table1,table2,table3 log=myimport.logRegards

Creation of Database View , Projection View

Hi ABAP EXPERTS,
Can anyone plz send me the step by step creation of DATABASE and PROJECT VIEWS. Just steps by step explanation will do , screen shots will be more than appreciated.
Kind Regards,
Sunil Ranal.

Database View (SE11)
Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set. In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.
Check this link for database view creation.
http://help.sap.com/saphelp_40b/helpdata/en/cf/21ed06446011d189700000e8322d00/content.htm
Projection View
Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed. A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.
Check this link for Projection view creation.
http://help.sap.com/saphelp_nw70/helpdata/en/cf/21ed20446011d189700000e8322d00/content.htm
Regards,
Maha

"Refresh after" insert fails for DB-View with INSTEAD OF Triggers

Hi,
I have a database view with INSTEAD OF triggers defined for INSERT, UPDATE, DELETE.
For some EO attributes the refresh after insert and update is defined.
Posting to database fails.
According to Database 9.2 Manual and a previous thread (BC4J and Updatable Views the RETURNING clause is not allowed for database views with INSTEAD OF triggers.
Is there a workaround so the refresh after is done, but without the RETURNING feature?
I only need to refresh some values. The PK i can set in the create method of the EO so refresh via a additional SELECT would be possible.
If not Feature Request:
Add the possibility to do the "refresh after ..." with a 2nd SELECT using the PK instead of using the RETURNING clause.
Of course then it is not possible to set the PK in the database trigger. PK has to be set in the create method of the EO.
Thanks,
Markus
GEMS IT

Hi Markus,
Turning on the stack trace (-Djbo.debugout put=Console - in the Project/runner) did help and I should have done it sooner. Turns out that when I constructed my EO based upon a database view - I should have left out the PKs of the base tables.
In my case, I am using an "Instead Of Trigger" to populate a multi-table arrangement (parent - child - grandChild - greatGrandChild relationship) where all base tables are using dbSequence/dbTriggers.
Final analysis - I would like to see BC4J handle this situation. I do not want to use View-Links and I should * not * have to resort to stored procedures and BC4J/doDML. If I construct a DB View this is participating in an parent - child - grandChild - greatGrandChild relationship that are using dbSequence/dbTriggers, then BC4J should be smart enough to construct VO knowing that I want to do insert, update, delete, selects - based upon this structure.
Thanks Markus,
Bill G...

Diff between maintence and database views

pls answer now,its urgent

Hi
Database Views
Data about an application object is often distributed on several database tables. A database view provides an application-specific view on such distributed data.
Database views are defined in the ABAP Dictionary. A database view is automatically created in the underlying database when it is activated.
Application programs can access the data of a database view using the database interface. You can access the data in ABAP programs with both OPEN SQL and NATIVE SQL. However, the data is actually selected in the database. Since the join operation is executed in the database in this case, you can minimize the number of database accesses in this way. Database views implement an inner join (see Inner and Outer Join).
If the database view only contains a single table, the maintenance status can be used to determine if data records can also be inserted with the view. If the database view contains more than one table, you can only read the data.
Database views should be created if want to select logically connected data from different tables simultaneously. Selection with a database view is generally faster than access to individual tables. When selecting with views, you should also ensure that there are suitable indexes on the tables contained in the view.
Maintenance View:
Maintenance views offer easy ways to maintain complex application objects.
Data distributed on several tables often forms a logical unit, for example an application object, for the user. You want to be able to display, modify and create the data of such an application object together. Normally the user is not interested in the technical implementation of the application object, that is in the distribution of the data on several tables.
A maintenance view permits you to maintain the data of an application object together. The data is automatically distributed in the underlying database tables. The maintenance status determines which accesses to the data of the underlying tables are possible with the maintenance view.
All the tables in a maintenance view must be linked with foreign keys, that is the join conditions for maintenance views are always derived from the foreign key You cannot directly enter the join conditions as for database views.
There are some restrictions for the attributes of the foreign keys with which the tables in a maintenance view can be linked
A standardized table maintenance transaction is provided (SM30), permitting you to maintain the data from the base tables of a maintenance view together.
Maintenance mechanisms, like screens and processing programs, must be created from the view definition with the transaction Generate Table View (SE54). This makes it possible to create easy-to-use maintenance interfaces in a simple manner.
If it is helpful rewards points
Reagards
Pratap.M

Can we poll for database view

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