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Home -> Community -> Usenet -> c.d.o.server -> Help! ORA-01658 on import, and with plenty of space
Hi Pedro,
Please stop calling me 'Mr Dunbar' - I'm Norman. Thanks :o) (Hey, we're all friends here remember !)
Next up, the reason for slower responses is probably because you
followed my suggestions !
When you removed the storage parameters from the script and pre-created
the tables, the tablespace defaults will have been used. If these are
quite small, and some of the tables quite large, then you will end up
with a lot of 'dynamic extension' going on as new extents are added to
tables and indexes as the import progresses.
Dynamic extensions are expensive operations and will slow things down - especially if the database in question has other schemas and they are being used. There is only a single space managemnt lock (I forget the exact name !) and every user adding or deleting extents has to queue up for it !
So if you are importing a 20 Gb table into a tablespace with INITIAL=NEXT=1024 KB, you'll need to dynamically extend the table 20,971,519 times.
It's all down to setting correct default storage on your tablespaces and having more than 1 tablespace for data. There is a white paper about setting up tablespaces for different sized objects at this URL:
http://technet.oracle.com/deploy/availability/pdf/defrag.pdf
Which will/should help enormously !
Cheers,
Norman.
Tel: 0113 289 6265 Fax: 0113 289 3146 URL: http://www.Lynx-FS.com
-------------------------------------
-----Original Message-----
From: mercadop_at_expertx.com (Pedro Mercado) [mailto:mercadop_at_expertx.com]
Posted At: Tuesday, August 27, 2002 5:12 PM
Posted To: server
Conversation: Help! ORA-01658 on import, and with plenty of space
Subject: Re: Help! ORA-01658 on import, and with plenty of space
I have employed the suggestions made by Mr. Dunbar, and it appears to creating the tables more efficiently. That is, the data is being spread evenly across the datafiles. However, the speed has dramatically slowed down. Is there a reason for this?
Thanks,
Pedro Mercado
Received on Wed Aug 28 2002 - 04:36:45 CDT
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