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Access ODBC: How does it handle queries?

Discussion in 'Information Technology' started by Zach, Jul 28, 2006.

  1. Zach

    Zach
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    Guest

    Can someone please tell me how Access 2003 handles regular queries to
    Oracle servers?

    Does Access hand off the SQL to be executed on the Oracle server, or
    does it download the needed table(s) and have Jet execute the SQL on
    the client?

    For background, I'm talking about an Access DB, not an Access Project.
    I'm also meaning regular queries, not SQL-Specific Passthroughs.

    Thanks!
     
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  3. Rick Brandt

    Rick Brandt
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    Guest

    Zach wrote:
    > Can someone please tell me how Access 2003 handles regular queries to
    > Oracle servers?
    >
    > Does Access hand off the SQL to be executed on the Oracle server, or
    > does it download the needed table(s) and have Jet execute the SQL on
    > the client?


    Yes and Yes.

    In other words it will do both depending on the query. A passthrough query
    will be sent entirely to the server for processing. A standard query
    against an ODBC link will send anywhere from all of the work to the server
    to almost none depending on how the query is constructed.

    My general advice is to use an Access query against the link and see how it
    performs. If performance is good then you can leave it that way. Queries
    that join multiple links from the same server would likely benefit from
    building a view on the server that does the join and then just query the
    view. That depends on whether you need the query to be editable though.

    The important thing is to try to get the WHERE clause and the joins done on
    the server whenever possible. That minimizes the data that needs to go over
    the LAN.

    --
    Rick Brandt, Microsoft Access MVP
    Email (as appropriate) to...
    RBrandt at Hunter dot com
     
  4. Pieter Wijnen

    Pieter Wijnen
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    Guest

    Access offloads as much work as it can to Oracle

    Pieter

    "Zach" <zach.taylor.12@gmail.com> wrote in message
    news:1153316381.881565.296640@i3g2000cwc.googlegroups.com...
    > Can someone please tell me how Access 2003 handles regular queries to
    > Oracle servers?
    >
    > Does Access hand off the SQL to be executed on the Oracle server, or
    > does it download the needed table(s) and have Jet execute the SQL on
    > the client?
    >
    > For background, I'm talking about an Access DB, not an Access Project.
    > I'm also meaning regular queries, not SQL-Specific Passthroughs.
    >
    > Thanks!
    >
     
  5. Pieter Wijnen

    Pieter Wijnen
    Expand Collapse
    Guest

    Access offloads as much work as it can to Oracle

    Pieter

    "Zach" <zach.taylor.12@gmail.com> wrote in message
    news:1153316381.881565.296640@i3g2000cwc.googlegroups.com...
    > Can someone please tell me how Access 2003 handles regular queries to
    > Oracle servers?
    >
    > Does Access hand off the SQL to be executed on the Oracle server, or
    > does it download the needed table(s) and have Jet execute the SQL on
    > the client?
    >
    > For background, I'm talking about an Access DB, not an Access Project.
    > I'm also meaning regular queries, not SQL-Specific Passthroughs.
    >
    > Thanks!
    >




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