• yuvipoy (3/4/2014)


    Thanks for your quick replay.

    uniqueidentifier column(with primary key (now)) has been used in table joining in current design.

    so if i remove the current primary key on uniqueidentifier, will the join perfomace degrade or grade(improve).

    I realize it is your primary key. That as a primary key is another topic. Is it also the clustered index? That is the problem here.

    I would recommend NOT removing your primary key on several 10 million row tables. Your performance will be even worse.

    What does this query return?

    select *

    from sys.indexes

    where OBJECT_NAME(object_id) = 'YourBaseTable' --whatever the name of your table is

    _______________________________________________________________

    Need help? Help us help you.

    Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

    Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

    Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
    Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
    Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
    Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/