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Home -> Community -> Mailing Lists -> Oracle-L -> buffer_size parameter for import utility
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
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). Received on Tue Aug 26 2003 - 03:09:27 CDT
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