Re: ** table with clob slow

Hi,

If you think exporting CLOBs are slow, wait till you import! It's much much slower.

During imports, depending on the size of your clob column, you may be able to get away with COMMIT=N. I've found this to be much faster than COMMIT=Y. However, it means that you must have a LARGE undo retention and tablespace, otherwise your import will fail.

The other trick we've found is that even though we have clob columns defined in the tables, they are actually empty. So doing a "sql unload" and sqlload without the clob columns will cut down your times.

HTH, Leng.

Date: Thu, 22 Jun 2006 19:35:23 -0700 (PDT)

From: A Joshi <ajoshi977_at_yahoo.com>

Subject: ** table with clob slow

Hi,

     We have a big table and it has one field with CLOB datatype. Doing an export on this table is very slow. I have tried with different buffer sizes of 2MB - 250MB. It is still slow. Any way to speed up export and other operations on the table like update,delete. Thanks for your help.

Leng Kaing

Senior Oracle DBA

Hansen Technologies; 2 Frederick St; Doncaster 3108

Ph: +61-3-9840-3832

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http://www.freelists.org/webpage/oracle-l Received on Fri Jun 23 2006 - 21:55:19 CDT