Is it a good idea to have primary key on DW table
- From: Anupam Pandey <my.oralce@xxxxxxxxx>
- To: oracle Freelists <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 4 Aug 2010 10:23:56 +0530
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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