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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Login Triggers
The queries we have which are slow, have some where clauses,
among others that is, to which we embed user information,
like privs, level, status etc, ie most likely personal info for each user.
What I was hoping is to fire a login trigger that would save this info in memory somehow, and then the queries could take it from there instead of issuing other queries to find it...
But thanks for the materialized views examples, we are going to have to think and perhaps compare before we figure it out...
Thanks,
maa
At 12:59 PM 3/12/2004, you wrote:
>If you had a login trigger that ran a 6 hour query, the user would, by
>default, not finish logging in until that query was done. You could have
>the login trigger submit a job that would run this query in the
>background, but then the user would have to know where to go to look for
>the results. If users ever do something other than run this query, you
>would be spending a lot of resources running the query when no one wanted
>the results.
>
>Materialized views are much, much easier to deal with in this
>situation. In addition to the fact that they're available to everyone all
>the time, they get refreshed automatically, you don't have to teach users
>where to go to get the data, and you don't execute huge queries when you
>don't need the results.
>
>
>Justin Cave
>Distributed Database Consulting, Inc.
>http://www.ddbcinc.com/askDDBC
>
>-----Original Message-----
>From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]
>On Behalf Of Nick Gabrielatos
>Sent: Friday, March 12, 2004 10:39 AM
>To: oracle-l_at_freelists.org
>Subject: Re: Login Triggers
>
>Thanks, that helps quite a bit.
>Let me ask you this, though,
>you think we should use cashed tables and materialized views instead of
>login triggers?
>
>Wouldnt a login trigger have an advantage?
>
>thanks,
>maa
>
>At 11:43 AM 3/12/2004, you wrote:
> >Maryan, materialized views are pre-built queries whose results are
> >stored in a table and refreshed periodically. Here is slightly modified
> >example from the manuals:
> >
> >CREATE TABLE sales_sum_table
> > (month VARCHAR2(8), state VARCHAR2(40), sales NUMBER(10,2))
> > STORAGE ( BUFFER_POOL KEEP);
> >
> >CREATE MATERIALIZED VIEW sales_sum_table
> > ON PREBUILT TABLE
> > REFRESH FAST START WITH SYSDATE NEXT SYSDATE + 1/(24*60)
> > ENABLE QUERY REWRITE
> > AS SELECT t.calendar_month_desc AS month,
> > c.cust_state_province AS state,
> > SUM(s.amount_sold) AS sales
> > FROM times t, customers c, sales s
> > WHERE s.time_id = t.time_id AND s.cust_id = c.cust_id
> > GROUP BY t.calendar_month_desc, c.cust_state_province
> >
> >
> >As it says, the view is refreshed periodically, in this case once a
> >minute. Results are stored in the table, which is, in turn, cached in
> >the KEEP buffer pool.
> >
> >On 03/12/2004 11:28:36 AM, Maryann Atkinson wrote:
> > > Thanks for the response
> > >
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > > > > It sounds like you want to prerun the user's query. While this
> > > > > is possible from a technical point of view, it is not a wise idea.
> > > >
> > > >Actually, it is. It is called "materialized view" and is done on
> > > >regular basis.
> > > >If you create it on prebuilt table which is in the "KEEP" pool,
> > > >you
> > get as
> > > >close to pre-caching the results of the desired query as possible.
> > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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