Oracle-L: Issues/Cautions Migrating Oracle DB across platforms

From: Hemant K Chitale <hkchital_at_singnet.com.sg>
Date: Wed, 11 Dec 2002 18:53:42 -0800
Message-ID: <F001.005182EB.20021211185342@fatcity.com>

We are considering migrating some Oracle Databases across platforms -- from Solaris to HPUX. We'll, of course, be using Export-Import.

I've been asked to come up with a list of issues / cautions to consider.

e.g. I can think of

Pre-Requisites :

The right [same or higher] version of the Oracle RDBMS + Patchset Release must be installed.
The database should be created with a minimum block-size of 4K, preferably 8K.
The database character-set should preferably be the same or a higher character-set. [eg US7ASCII or WE8ISO8859P1 or UTF8]
The NLS_LANG settings during the Export and Import must be complaint.

Potential Issues :

BFILE references will become invalid as BFILEs are stored outside the database.
If there are tables containing LOBs, the import can be slower. [There was an 8i bug requiring COMMIT=Y to improve Import performance but commiting at every record, instead of at every buffer-size].

Recommendations / experiences appreciated.

Hemant K Chitale
http://hkchital.tripod.com
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Author: Hemant K Chitale
INET: hkchital_at_singnet.com.sg

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