Re: buffer_size parameter for import utility

use buffer size = 1045760 (10Mb with commit = Y). If there of columns with LOB then it is going to be slow.

HTH
> Hello,
>
> I don't understand very well the buffer_size parameter and how to use it.
> with imp tool.
>
> If I read the help:
>
> BUFFER
>
> Default: operating system-dependent
>
> The integer specified for BUFFER is the size, in bytes, of the buffer
> through which data rows are transferred.
>
> BUFFER determines the number of rows in the array inserted by Import.
> The following formula gives an approximation of the buffer size that
> inserts a given array of rows:
>
> buffer_size * rows_in_array * maximum_row_size
>
>
> I have a database with 3 big tables (each containing between 9 and 13
> billions rows).
> The others 60 tables contains about 5 and 20000 rows.
>
> The biggest table is:
>
> SQL> describe gesten3.grandeur_mesure;
> Nom NULL ? Type
> -----------------------------------------
> ------------------------------------
> ID_GRANDEUR NOT NULL NUMBER(15)
> DATE_AQUISITION NOT NULL DATE
> VALEUR FLOAT(126)
> VALIDITE NUMBER(1)
> ID_TYPE_ACQUISITION NUMBER(15)
> UTILISATION NUMBER(15)
> ID_COMPTEUR NUMBER(15)
> ID_TYPE_GRANDEUR NUMBER(15)
> ID_UNITE NUMBER(15)
> ID_HISTORISATION NOT NULL NUMBER(15)
>
> SQL>
>
> Small tables, of course are imported very rapidly, but this table take
> several hour to finish import.
> How to improve that ?
>
> This database is running 8.1.7.2 under Solaris 8.
>
> Thanks for your help and have a nice day.
>
> Jean Berthold
>
> __________________________________________
> Jean Berthold
> EOS - energie ouest suisse
> Chemin de Mornex 10 , CP 570
> CH-1001 Lausanne , Switzerland
> Tel. : +41 (0)21 341 24 58
> Fax : +41 (0)21 341 20 49
> E-Mail : jean.berthold_at_eosholding.ch
> ---------------------------------
> UNIX is user friendly.
> It's just selective about who its friends are.
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: BERTHOLD Jean
> INET: Jean.BERTHOLD_at_eosholding.ch
>
> Fat City Network Services -- 858-538-5051 http://www.fatcity.com
> San Diego, California -- Mailing list and web hosting services
> ---------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Corniche Park
  INET: cornichepark_at_cwazy.co.uk

Fat City Network Services    -- 858-538-5051 http://www.fatcity.com
San Diego, California        -- Mailing list and web hosting services
---------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).