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Can ever selet count(*) be faster that select *

  • July 9, 2014 at 3:33 pm

    #296427

    I have come across a case where "select count(*) " is way slower than " select * from my view order by id ", i will provide more details, but i am curious to know how could count(*) be faster.

  • July 9, 2014 at 4:01 pm

    #1728227

    Count(*) can easily be faster than select *. Firstly SQL will use the smallest index on that table (assuming no where clause). Second, less data to transmit.

    Gail Shaw
    Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
    SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

    We walk in the dark places no others will enter
    We stand on the bridge and no one may pass

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