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From:Sasha Pachev Date:July 11 1999 9:57pm
Subject:Re: [PHP3] optimising a query
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Adam Powell wrote:
> What we are trying to do is take the load off the database and put it in the
> script.  We have MANY variables associated with the banner, like weighting,
> size, subjects it favours, subjects it rejects, time targeting and so on...
> we also have a cookie-based profile of the individual banner viewer that we
> use to judge what would be the best banner for them to see at any one time.
> The problem with all this stuff is that we cant put it in the SELECT
> statement, as this would make it about 20 lines long and span about 3
> tables, so what we are trying to do is do a SELECT * FROM banners, and then
> do a loop that goes through each banner and assigns it points based on the
> individual criteria, and then do a bit of fuzzy random logic to pick the
> best one.  We are moving the processing overhead from our database server to
> our individual banner servers.
> So yes, we do need to do the entire SELECT statement, which is why I am
> wondering how we can reduce the load...  we only have to select four
> individual rows from the DB, is it quicker to do select a, b, c, d FROM...
> instead of SELECT *?  I think it is, but I am not sure by what degree....
> Also, if there is a criterion that always means a banner is inactive, would
> it slow us down if we used SELECT a, b, c, d FROM banners WHERE
> weighting=inactive?
> Thanks,
> Adam Powell,
> CTO - Click Agents Corporation.
> Web :
> Email : adam@stripped

The only time shitfing the load from the database to a script could
possibly make sense that I can think of is when your database is not
running on the same machine as the script. Even then, this most of the
time will not be the best solution.

Ideally, you want to incorporate all of your operations natively into
the database. You may consider modifying the sources of mysql to
incorporate all the fancy processing. If you do not feel competent
enough, or just do not have the time, you may consider getting TCX to do
it for you. Don't know if the extended support will cover it. In any
case, I imagine you can work out some kind of a deal with TCX to help

Sasha Pachev
optimising a queryAdam Powell11 Jul
  • Re: [PHP3] optimising a queryPaul DuBois11 Jul
    • Re: [PHP3] optimising a queryAdam Powell11 Jul
      • Re: [PHP3] optimising a queryAriel11 Jul
    • Re: [PHP3] optimising a querySasha Pachev12 Jul
    • Re: [PHP3] optimising a queryAdam Powell12 Jul
    • Re: [PHP3] optimising a querySasha Pachev12 Jul
  • Re: optimising a querySasha Pachev12 Jul