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From:Jules Bean Date:August 31 1999 9:26pm
Subject:Re: MySQL Speed ?? slower the Oracle ?
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Doug Salot wrote:
> 
> On Tue, 31 Aug 1999, Michael Widenius wrote:
> 
> > It's only when you mix many slow queries with writes and can't let the
> > readers wait as MySQL will not perform as good as Oracle)
> 
> Is this because MySQL does table locking and Oracle does row locking, or
> is it that Oracle does some sort of predictive query prioritizing?
> 

My understanding of it is this:

1) Yes, row locking helps.

2) Oracle uses a 'read uncommited' isolation level which essentially
allows read access to coexist with write access, if you don't mind
reading broken data from time to time (I don't understand this - it
sounds like a potential source of subtle and dangerous bugs to me, but
that's what read uncommited means).

3) Transaction processing allows you to hold off your write locks until
the last minute, which may give a performance gain.

I'd be very interested if someone else had some more authoritative data
on how Oracle is superior (or whether it really is at all...)

Jules



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Thread
MySQL Speed ?? slower the Oracle ?Ben-Nes Michael31 Aug
  • Re: MySQL Speed ?? slower the Oracle ?Thimble Smith31 Aug
  • Re: MySQL Speed ?? slower the Oracle ?Paul DuBois31 Aug
    • Re: MySQL Speed ?? slower the Oracle ?Ben-Nes Michael31 Aug
    • Re: MySQL Speed ?? slower the Oracle ?info31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?sinisa31 Aug
  • Re: MySQL Speed ?? slower the Oracle ?Ben-Nes Michael31 Aug
    • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?Doug Salot1 Sep
        • Re: MySQL Speed ?? slower the Oracle ?Jules Bean1 Sep
          • Re: MySQL Speed ?? slower the Oracle ?James Rogers1 Sep
        • Re: MySQL Speed ?? slower the Oracle ?Jules Bean1 Sep
        • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius1 Sep
  • Re: MySQL Speed ?? slower the Oracle ?Cary Collett31 Aug
  • Re: MySQL Speed ?? slower the Oracle ?Rick Moore31 Aug
    • Re: MySQL Speed ?? slower the Oracle ?Steve Ruby31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?Jules Bean31 Aug
        • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?sasha31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?Jules Bean31 Aug
        • Job Available - Perl/MySQLArlen1 Sep
      • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?Jules Bean1 Sep
      • Re: MySQL Speed ?? slower the Oracle ?Rick Moore1 Sep
      • Re: MySQL Speed ?? slower the Oracle ?Sasha Pachev6 Sep
    • Re: MySQL Speed ?? slower the Oracle ?Orlando Andico31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?ed31 Aug
        • Re: MySQL Speed ?? slower the Oracle ?Cary Collett31 Aug
          • Re: MySQL Speed ?? slower the Oracle ?ed31 Aug
        • Re: MySQL Speed ?? slower the Oracle ?Orlando Andico31 Aug
          • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius1 Sep
            • MySQL, GPL and RedHatMike Wexler1 Sep
              • Re: MySQL, GPL and RedHatThimble Smith1 Sep
              • MySQL, GPL and RedHatMichael Widenius1 Sep
    • Re: MySQL Speed ?? slower the Oracle ?James Manning31 Aug
      • Re: MySQL Speed ?? slower the Oracle ?Michael Widenius1 Sep
      • Re: MySQL Speed ?? slower the Oracle ?Ričardas Čepas1 Sep
  • Re: MySQL Speed ?? slower the Oracle ?Ben-Nes Michael31 Aug
  • Re: MySQL Speed ?? slower the Oracle ?sasha31 Aug
Re: MySQL Speed ?? slower the Oracle ?cmaurand1 Sep