I will second Lisa's recommendations.
If you have much data, and/or will be doing this frequently, SQL*Loader
is your friend. It is very fast.
Loading from a SQL script is very bad unless you have small amounts
of data.
I once worked with a duhveloper who could not be dissuaded from
loading all data from SQL scripts. We're talking millions of rows
here. A single 10 gigabyte SQL script of insert statements.
She single handedly brought our DW to it's knee's. It begged
for mercy. There was none. Duhveloper was fired. :)
Jared
"Koivu, Lisa"
<lisa.koivu@efair To: Multiple recipients of list
ORACLE-L <[EMAIL PROTECTED]>
field.com> cc:
Sent by: Subject: RE: Data load options
[EMAIL PROTECTED]
07/25/01 07:26 AM
Please respond to
ORACLE-L
Hi Sean,
Others have given you different options. Here's some considerations:
1. SQL Script.
Can be SLOW
May require intermittent commits in your script
Manual and error prone
Must go through SQL engine
2. SQL Loader
Can be very fast (direct - bypassing SQL engine).
Direct path load will invalidate indexes.
You can keep track of rejected records easily (.bad file)
Dependent upon your file format being EXACT, no errors.
3. Import
Requires minimal manual fiddling
Can be very slow - I once imported 150GB and it took ~3 days
Does not seamlessly handle all object types (INtermedia (domain)
indexes is one example)
Restarting an import will take a lot longer. If your import fails, be
sure and truncate/drop all tables before starting again.
Have the option of not including indexes (INDEXES=N)
Can also reset your storage parms prior to import (export with data=n,
edit file [SSSHHH] and enter new storage parms / import, export with
data=y, import data with IGNORE=Y)
I'm sure others will have additional considerations to share. My choice
has always been exp/imp.
Lisa Koivu
The Vicodin-enhanced DBA
Ft. Lauderdale, FL, USA
-----Original Message-----
From: O'Neill, Sean [SMTP:[EMAIL PROTECTED]]
Sent: Wednesday, July 25, 2001 6:16 AM
To: Multiple recipients of list ORACLE-L
Subject: Data load options
I'm trying to compile a list of options for loading data into an
Oracle
database on NT platform. What I've come up with so far is:
[1] SQL script that performs inserts, updates.
[2] SQL Loader utility
[3] Import utility
Are there others?
Anyone care to share experience based opinions on pros and cons of the
methods?
Sean :)
Rookie Data Base Administrator
[0%] OCP Oracle8i DBA
[0%] OCP Oracle9i DBA
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