Re: Loading small tables into memory for the application lifetime

From: Michael Gentry (blacknex..mail.com)
Date: Mon Jun 30 2008 - 10:28:48 EDT

  • Next message: Michael Gentry: "Re: Loading small tables into memory for the application lifetime"

    http://cayenne.apache.org/doc/moving-objects-between-contexts.html

    On Mon, Jun 30, 2008 at 9:06 AM, Øyvind Harboe <oyvind.harbo..ylin.com> wrote:
    > In the apps I'm working on I can generally sort tables into two
    > categories:
    >
    > 1. tables that change as part of normal operation of the database
    > and/or where the number of records is too large to fit into memory
    >
    > 2. various and sundry small tables. These have a small number
    > of records, change infrequently and can easily fit into memory. Loading
    > these tables take an instant(lest I'd categorize them as #1 tables).
    >
    > #1 has relationships to #2 entries. These are constantly resolved via
    > sql queries.
    > At a guess I'd say that 95% of all queries are to resolve relationships from
    > #1 to #2. Ideally I should be able to mark a table as #2 via a configuration
    > option in my application as part of hardcoded tweaking of the app.
    >
    > Is there a way to load #2 permanently into memory so as to avoid
    > SQL statements to resolve relationships from #1 to #2?
    >
    >
    > Since loading all #2 tables take an instant, they could be dumped if
    > more than N seconds has passed since they were last used.
    >
    > --
    > Øyvind Harboe
    > http://www.zylin.com/zy1000.html
    > ARM7 ARM9 XScale Cortex
    > JTAG debugger and flash programmer
    >



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