RE: Is it a good idea to have primary key on DW table
- From: "Powell, Mark" <mark.powell2@xxxxxx>
- To: oracle Freelists <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 4 Aug 2010 13:56:03 +0000
If you want the database to protect the integrity of the data from the
insertion of logically duplicate data then declaring a PK contraint on the
column(s) that make up the PK is a good idea even in a warehouse. The same
would be true for FK declarations.
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Anupam Pandey
Sent: Wednesday, August 04, 2010 12:54 AM
To: oracle Freelists
Cc: pandey83@xxxxxxxxx
Subject: Is it a good idea to have primary key on DW table
Hi Listers,
I was trying to do a poc whether its good idea to have the
primary key constraint on FACT table in DW envioronment or not .
Here is what i found :-
1. Once I loaded the table for few days and started the primary key creation
process ,other select queries on that table was blocked.
SID SQL_ID SQL_HASH_VALUE BLOCKING_INSTANCE
BLOCKING_SESSION SQL_TEXT
1 322 5adg0zfm9zrat 2795494745 alter table
FACT_TEST add constraint pk_FACT_TEST primary key (<COLUMN_LIST>)
2 389 9n8jftdhvb5q0 1639290560 1 322 select
date_key,count(*) from fact_test group by date_key
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