Implement Oracle Streams without having Primary Keys

In our environment, we can't create primary keys so anyone know how to implement oracle streams without having primary keys on the tables.
Thanks,

You can JOIN tables on any compatible columns or functions (like LEFT (PONumber,10) ):
http://technet.microsoft.com/en-us/library/ms191517(v=sql.105).aspx
BOL: "When the (ON) condition specifies columns, the columns do not have to have the same name or same data type; however, if the data types are not the same, they must be either compatible or types that SQL Server can implicitly convert. If the data types
cannot be implicitly converted, the condition must explicitly convert the data type by using the CONVERT function. "
LINK:
http://technet.microsoft.com/en-us/library/ms177634(v=sql.105).aspx
Typically tables are JOIN-ed on FK-s and PK-s.
Kalman Toth Database & OLAP Architect
SELECT Video Tutorials 4 Hours
New Book / Kindle: Exam 70-461 Bootcamp: Querying Microsoft SQL Server 2012

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Hi,
On one of our client majority of tables in their huge database are not having primary key. While starting journaling ODI-15021 error is being thrown. Is there any way to configure CDC on those tables. Even we are not in a situation to create logical primary key on ODI level. Client is asking for an oracle document which talks about such restriction. Kindly help me out. I've gone through documentation as well metalink. I'm not able to find any information regarding it.
Regards,
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Hi,
Thanks a lot for your prompt reply. Let me describe my situation bit more clearer. I've configured ODI CDC on one schema which contains 1200 tables. I tried to configure primary key on each data store in source model but being an integrator, I'm not the right person to decide primary key on tables so, I reverted back to client to create primary key on tables or suggest what should be primary key. Now, client is asking for an oracle document stating that primary key is mandatory. They have such 20 schema with similar huge number of tables. I've gone through various documents and meta-links but no luck. Need urgent help on it.
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hi!
is it possible to create a db-table without a primary key? if there is a possbility, how can i do this?
greetings
stefan

Hello,
The link i provided contains all your answers. Its oracle 8i documentation release. It contains everything that you want to know about oracle 8i release.
What Are Index-Organized Tables?
Index-organized tables are tables with data rows grouped according to the primary key. This clustering is achieved using a B-tree index. B-tree indexes are special types of index trees that differ from regular table B-tree indexes in that they store both the primary key and non-key columns. The attributes of index-organized tables are stored entirely within the physical data structures for the index.
Why Use Index-Organized Tables?
Index-organized tables provide fast key-based access to table data for queries involving exact match and range searches. Changes to the table data (such as adding new rows, updating rows, or deleting rows) result only in updating the index structure (because there is no separate table storage area).
Also, storage requirements are reduced because key columns are not duplicated in the table and index. The remaining non-key columns are stored in the index structure.
Index-organized tables are particularly useful when you are using applications that must retrieve data based on a primary key. Also, index-organized tables are suitable for modeling application-specific index structures. For example, content-based information retrieval applications containing text, image and audio data require inverted indexes that can be effectively modeled using index-organized tables.
See Also: For more details about index-organized tables, see Oracle8i Concepts.
Differences Between Index-Organized and Regular Tables
Index-organized tables are like regular tables with a primary key index on one or more of its columns. However, instead of maintaining two separate storage spaces for the table and Btree index, an index-organized table only maintains a single Btree index containing the primary key of the table and other column values.
Index-organized tables are suitable for accessing data by way of primary key or any key that is a valid prefix of the primary key. Also, there is no duplication of key values because a separate index structure containing the key values and ROWID is not created. Table 14-1 summarizes the difference between an index-organized table and a regular table.
Table 14-1 Comparison of Index-Organized Table with a Regular Table
Regular Table Index-Organized Table
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Primary key uniquely identifies a row; primary key must be specified
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ROWID pseudocolumn refers to primary key-based logical ROWID
Secondary indexes store physical data
Secondary indexes store primary key-based logical ROWID
Can be stored in a hash or index cluster
Cannot be stored in a hash or index cluster
Regards,
Shekhar Kulkarni

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Hi,
Anyone knows how to do hibernate mapping for table or view without a primary key?
thanks.
cc

or you can make all column primary key .Anybody seriously considering that as a good idea should understand the implications:
1. this requires that each row be unique - that's a minor issue normally, but can be a significant problem in some cases
2. in practically all databases, a primary key constraint creates a unique index - this has many implications:
a) in most databases, the index stores a copy of the column data that is indexed - this suggestion therefore more than doubles the data storage required for the data
b) whenever an indexed column is changed, the index has to be maintained - this suggestion then more than doubles the work that each UPDATE statement has to do, since both the table and the index have to be maintained for any UPDATE at all
This might work OK for toy projects, but it doesn't scale well at all...

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Is it possible to Install Oracle Apps without having the user in a group dba

Can we Install oracle 11i with the user oracle:dba for db tier and user aapl:aapl for application tier.
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Problem with JPA Implementations and SQL BIGINT in primary keys

I have a general Question about the mapping of the SQL datatype BIGINT. I discovered, that there are some different behaviour depending on the JPA implementation. I tested with TopLink Essentials (working) and with Hibernate (not working).
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/*==============================================================*/
/* Table: CmdQueueIn */
/*==============================================================*/
create table MTRACKER.CmdQueueIn
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@Id
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@Column(name = "CmdQueueInId", nullable = false)
private BigInteger cmdQueueInId;
When using hibernate 3.2.1 as JPA provider I get the following exception:
avax.persistence.PersistenceException: org.hibernate.id.IdentifierGenerationException: this id generator generates long, integer, short or string
at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:629)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:218)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:176)
at $Proxy16.persist(Unknown Source)
at com.trixpert.dao.CmdQueueInDAO.save(CmdQueueInDAO.java:46)
at com.trixpert.test.dao.CmdQueueInDAOTest.testCreateNewCmd(CmdQueueInDAOTest.java:50)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at
Caused by: org.hibernate.id.IdentifierGenerationException: this id generator generates long, integer, short or string
at org.hibernate.id.IdentifierGeneratorFactory.get(IdentifierGeneratorFactory.java:59)
at org.hibernate.id.IdentifierGeneratorFactory.getGeneratedIdentity(IdentifierGeneratorFactory.java:35)
at org.hibernate.id.IdentityGenerator$BasicDelegate.getResult(IdentityGenerator.java:157)
at org.hibernate.id.insert.AbstractSelectingDelegate.performInsert(AbstractSelectingDelegate.java:57)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2108)
at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2588)
at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:48)
at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:290)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:180)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:108)
at org.hibernate.event.def.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:131)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:87)
at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38)
at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592)
at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596)
at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:212)
... 34 more
This means, that their ID generator does not support java.math.BigInteger as datatype.
But the code works if I take TopLink essentials as JPA Provider.
Looking at the spec shows the following:
In chapter 2.1.4 "If generated primary keys are used, only integral types will be portable." Integral datatypes are byte, short, int, long and char. This would mean, that the Hibernate implementation fits the spec but there seem to be a problem in general with BIGINT datatypes.
I use a SYBASE database. There it is possible to declare a UNSIGNED BIGINT. The range of numbers is therefore 0 - 2^64 - 1. Since in Java a long is always signed it would mean its range is from -2^63 -1 to 2^63 -1. So a mapping of BIGINT to java.lang.long could result in an overflow.
The interesting thing is, that I used NetBeans to reverse engineer an existing database schema. It generated for all Primary Keys of Type BIGINT automatically a java.math.BigInteger. But for other fields (not being keys) it mapped BIGINTs to java.lang.long.
It looks like there are some problems with either the spec itself or the implementation of it. While TopLink seems to handle the problem correctly, Hibernate doesn't. But Hibernate seems to fulfill the spec.
Is anybody familiar with the Spec reading this and can elaborate a little about this situation?
Many thanks for your input and feedback.
Tom

Not sure if I clearly understand your issue, would be good if you can explain it a bit more clearly.
"I select a value from LOV and this value don't refresh in the view"
If you mean ViewObject, check if autoSubmit property is set to true.
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How to code the ejbCreate() method without initailizing primary key?

Hi all,
I've just started learning about EJBs, and now am at the stage of learning how to create, deploy and test a CMP Entity Bean.
Ran into a problem which I'm hoping someone can help out with.
I'm using SQL Server 2000 as my backend database, and have created a simple table called TEST with 2 fields, id and name. id is set as the primary key, and as an identity conlumn. What this means is that when we do inserts, we don't need to specify a value for the id column. SQL Servers automatically generates that value.
Here's my ejbCreate method in my bean class:
public Integer ejbCreate(String name) throws CreateException {
    this.setName(name);
}When I tried to run the create method from a web client, I got this error:
javax.ejb.CreateException: [EJB:010148]In EJB 'SampleEJB', the primary key field 'id' was not set during ejbCreate. All primary key fields must be initialized during ejbCreate. at weblogic.rmi.internal.ServerRequest.sendReceive(ServerRequest.java:186) at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:284) at weblogic.rmi.cluster.ReplicaAwareRemoteRef.invoke(ReplicaAwareRemoteRef.java:244) at everbright.ejb.SampleEJB_uzc4wg_HomeImpl_813_WLStub.create(Unknown Source) at jsp_servlet.__index._jspService(__index.java:152) at weblogic.servlet.jsp.JspBase.service(JspBase.java:33) at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:996) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:419) at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:315) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6452) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:118) at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3661) at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2630) at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219) at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
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I tried to initailize it to null, but that gave me a NullPointerException.
Why do we need to initialize the primary key field in ejbCreate? Should the container do the insert and then get it from the table accordingly?
Is there any other way I can get this set-up working?
Thanks!

Hi Fusion777,
Ya, I've been searching around forums for an answer also. Apparently this is indeed a problem that has no general solution. It depends on 2 factors:
1) Whether or not the database supports autogenerate key (which most does) and how (Oracle does it by sequences while SQL Server by identities)
2) Whether or not the application server supports 1).
In my case, I'm using SQL Server and Weblogic Server 8.1 and most fortunately, Weblogic does support identities and sequences. Just define the <auto-key-generation> stanza in your weblogic-cmp-rdbms-jar.xml deployment descriptor, as follows:
<automatic-key-generation>
     <generator-type>ORACLE</generator-type>
     <generator-name>test_sequence</generator-name>
     <key-cache-size>10</key-cache-size>
</automatic-key-generation>
<automatic-key-generation>
     <generator-type>SQL-SERVER</generator-type>
</automatic-key-generation>
<automatic-key-generation>
     <generator-type>NAMED_SEQUENCE_TABLE</generator-type>
     <generator-name>MY_SEQUENCE_TABLE_NAME</generator-name>
     <key-cache-size>100</key-cache-size>
</automatic-key-generation>I've tried that and it works :-)
I gather from your reply that those who are using JBoss are equally fortunate :-)
So I thought I'll share this in case some other poor fellow is facing the same problem as we are. At least worse come to worse, he'll have the option of switching to either JBoss or Weblogic and know that it works in both :-)
Some other users seem to be against the idea of using auto-generated keys for precisely the reason that it is not a standard across database and application servers. See this thread:
http://forum.java.sun.com/thread.jspa?forumID=13&threadID=329896
I've in fact stopped working on EJB 2.0 and am exploring something called Hibernate, which seems to have a more generic way of dealing with the auto-generated key issue. In fact, I've heard news that EJB 3.0, which is the upcoming standard for EJB, will be heavily inspired by Hibernate as far as CMP Entity Beans are concerned.
You can check out Hibernate at http://www.hibernate.org.

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Hi,
I have a number of tables which need a standard updatable query report (MRU/MRD/MRI). However, these tables do not have a generated primary key, but the primary key is edited by the user.
I've tried generating a standard updatable report for this, however, this doesn't seem to work because it needs a generated primary key.
So I've tried to write the MRU process myself, which could work. However, how would I add a new row, because this isn't possible unless you use the standard updatable report!!... :S I can't help but think this must be me overlooking something. I can't imagine APEX cannot use standard updatable reports without a generated primary key!
Who can help?

The solution you're suggesting is the best in my oppinion as well, however, I would like to know if it's possible to resolve this issue in another way. Using technical key's is best practice, but it's not wrong if you don't... so why isn't there a way in APEX to handle this?
Maybe using the "Primary Key Source Type" as "Custom PL/SQL Function" in the "Tabular Form Element" is a possibility?
I will try to convince the customer (other IT department) to use a technical primary key and replace the user generated key by a unique constraint, but ... I just want to know :)
Edited by: Voxie2 on Jan 7, 2010 2:30 PM

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835401 wrote:
Table Data Indexes Model Constraints Grants Statistics UI Defaults Triggers Dependencies SQL
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