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Home -> Community -> Mailing Lists -> Oracle-L -> RE: external tables
i've got a small whitepaper of the tests we conducted in house. will send as soon as i get back to work monday.
although your theory is true. since there is no loading pe say involved you can query immediately versus wait for a load to complete which helps in scaling down load times for stuff you just want to add or update in another table or plain just query . Save's a lot of db space and can be used for archiving data.
"Powell, Mark D" <mark.powell_at_eds.com> wrote:
Fred, External tables are just sqlldr executed from within the db. I
haven't noticed any real time difference from insert select from
external_table verse loading the same target via an external sqlldr. Do you
have any test results you can share?
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Fuad Arshad
Sent: Thursday, July 29, 2004 10:47 PM
To: oracle-l_at_freelists.org
Subject: Re: external tables
external tables are normally fast without indexes as they rely on fs access
time .
on the other hand i use them exclusively for loading data in my dw. so its
sure beats thetime taken by loading the time that sqlloader takes to load
the data and process it.
susan lam wrote:
Hi,
I've a huge flat file (about 20GB) to load into a 9i
database. I would like to make use of the external
table feature but I do not know the usefulness of it
if I cannot create any indexes on external tables.
Querying on the table will be slow without the
indexes. Are there other alternatives where I could
make use of the external table feature and yet be able
to query the table without any performance impact?
TIA susan
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