Remove the primary key constraint and add new primar key to the table.

Hi all,
We had a design plan to remove a primary from the table on column X(VARCHAR) and add a new primary key on column Y(sequence)(dimensional table). Instead, I am planning to create a unique index on the column Y (I am referring column Y in my Fact table).
I am using the column Y while joining the dimensional and fact table. Now, my question is.
Is the retrieval will be faster if I make column Y as primary key or Is it the performance same if I create a unique index on it ?
Note: Both column X and Y in dimension table are unique and not null. Don't want to alter the existing system hence want to create unique index .
Please suggest.
Thanks and Regards
Nagaraja Akkivalli

When you define a column as Primary key column you give certain information to Oracle that i can use when accessing that table. And similarly when you say a column as Unique Key column you give certain details to oracle that i can use when accessing that table.
So it is up to you to decide if the what that column is meant to do. And decide based on that.
For example a Unique column can have NULL values. But a primary key cannot have NULL value. This piece of information can be critical to oracle to generate the best plan.

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Before you pull the blade, uninstall Exchange Server gracefully, as this will save you AD & Exchange headaches later on.
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--The incentive for the experts to answer posts is to get their replies marked as helpful, or as the answer to our questions, help them help us, mark posts accordingly--

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Hi,
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I am providing support to one of our clients, where we have jobs scheduled to load the data from the tables in the source database to the destination database via SSIS packages. The first time load is a full load where we truncate all the tables in the destination
and load them from the source tables. But from the next day, we perform the incremental load from source to destination, i.e., only modified records fetched using changed tracking concept will be loaded to the destination. After full load, if we run the incremental
load, the job is failing with the error on one of the packages "Violation of PRIMARY KEY constraint. Cannot insert duplicate key in object '<tablename>'. The duplicate key value is <1234>, even though there are no duplicate records. When we
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Thank you,
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Hi,
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Remove the primary key constraint and add new primar key to the table.

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