How to do hibernate mapping for table or view without a primary key

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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How to speed up fast refresh of materialized view without primary key

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I had a materialized view that was taking longer to perform a fast refresh than it took to perform a complete refresh. My mview had no primary key, as the base table had no primary key.
I created a trace file for the session and saw references to a column M_ROW$$ in my mview. Nowhere in the data dictionary could I find a reference to the m_row$$ column in my mview, but apparently it exists and is created automatically. After creating the index below, the fast refresh took 6 minutes to add 500k rows to the materialized view. (versus 4+ hours without the index) When I looked in the trace file, I noticed that for each row in the mview log, it first tries to update the mview with an UPDATE statement, then it performs an insert of the new data. Seems like it should be able to determine whether to perform an update or insert based on the DMLTYPE$$ column of the mview log. What was killing my performance was the UPDATE phase. Since I had no primary key on the mview, and no index on the m_row$$ column, the UPDATE phase was performing a full table scan of my mview for every row in the mview log. I was expecting it to be smart enough to only perform inserts, as the only transactions against the base table were inserts.
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Well, there indeed is a column called M_ROW$$
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Materialized view log created.
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Name                                                  Null?    Type
M_ROW$$                                                        VARCHAR2(255)
SNAPTIME$$                                                     DATE
DMLTYPE$$                                                      VARCHAR2(1)
OLD_NEW$$                                                      VARCHAR2(1)
CHANGE_VECTOR$$                                                RAW(255)
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First thing is you need to have the access key to change any standard dictionary object/standard programs/ standard transactions.You may get this from your basis person after getting approval from your respective manager.But changing or modifying the standard object is not recommended, but if there is no alternate to meet the business requirement then we have to follow this way only.
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Yes, I agree. I am doing data profiling and testing all these tables. I am expecting that the results show me zero, however, if there were any problems with the settings, then I should get something. I think that the subquery is needed because if I used
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i'm working with OWB 9.2,I was imported the table from database,when i validating that it is giving message:
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Hi Ashok,
I'm quite curious how you managed to get a table with 2 PK's.
I tried it myself:
=======================================================
SQL>create table x(c1 number constraint pk1 primary key,c2 number constraint pk2 primary key, c3 date);
create table x(c1 number constraint pk1 primary key,c2 number constraint pk2 primary key, c3 date)
ERROR at line 1:
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SQL>ed
Wrote file afiedt.buf
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SQL>/
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=====================================================
As you can see, trying to create a table with more than 1 PK is impossible. With Unique Key, that IS possible (see second example).
I don't expect mappings to function properly with such an error message.
Is it possible for you to drop the table in the database, correct the definition of the table in OWB and then deploy that corrected version to the database?
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Hello Gurus ,
I have a table with one column as primary key, I need to create a new row in the table, but with same data as in one of the rows, but with different primary key, in short a duplicate row with diferent primary key ..
Any ideas of how it can be done without much complication?
Thanks in advance for your reply.
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user9970447 wrote:
Hello Gurus ,
I have a table with one column as primary key, I need to create a new row in the table, but with same data as in one of the rows, but with different primary key, in short a duplicate row with diferent primary key ..
Any ideas of how it can be done without much complication?
Thanks in advance for your reply.
Reards,
Swapneel Kalesomething like
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information :
ASD.SUBHI.COM is database link from oracle to microsoft sql
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Note: I go to sql server and verify that primary key is creates
is this the best place to like this question ?
if you need more details please tell me I need the answer

I make replication between oracle and Microsoft sql using getway for sql but when I insert to table in oracle I get this error in apply process
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ASD.SUBHI.COM is database link from oracle to microsoft sql
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Note: I go to sql server and verify that primary key is creates
is this the best place to like this question ?
if you need more details please tell me I need the answer

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How to do hibernate mapping for table or view without a primary key

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