Solved

slow Datapump Import

Posted on 2013-05-16
4
1,069 Views
Last Modified: 2013-05-28
I have a table with XMLTYPE column and storage type as CLOB,the import seems to be slow with datapump,are XMLYTYPE/LOBS columns loads are usually slow if so,why?

Thanks
0
Comment
Question by:monto1
4 Comments
 

Author Comment

by:monto1
ID: 39170978
Version is 11202 on RHEL 5.5
0
 
LVL 15

Assisted Solution

by:Franck Pachot
Franck Pachot earned 250 total points
ID: 39174004
Hi,

Do you import over a db link ? Then it is a know issue.
The LOBs are retreived one by one over a DB LINK.
The only workaround is to go through a dumpfile.

See: Bug 4438573 : DATAPUMP RUNS VERY SLOW OVER NETWORK FOR TABLES WITH CLOBS

Regards,
Franck.
0
 
LVL 3

Accepted Solution

by:
tkuther earned 250 total points
ID: 39174034
It depends on various things like size of the CLOBs and of course server resources, but generally CLOB imports are slower as they're done row by row, instead of using blocks. This is also true for exports. Especially when using network dblink this causes quite some network roundtrip.

If the import duration is critical, a sloution could be to use transportable tablespaces.

See http://docs.oracle.com/cd/B28359_01/appdev.111/b28369/xdb26imp.htm#ADXDB3000 for some more info on the matter
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
PL/SQL Display based on value 4 39
How to Gracefuly recover in Racle stored procedure 1 33
Sybase and replication server 13 39
date show only hh:mm 2 27
Working with Network Access Control Lists in Oracle 11g (part 1) Part 2: http://www.e-e.com/A_9074.html So, you upgraded to a shiny new 11g database and all of a sudden every program that used UTL_MAIL, UTL_SMTP, UTL_TCP, UTL_HTTP or any oth…
From implementing a password expiration date, to datatype conversions and file export options, these are some useful settings I've found in Jasper Server.
This video shows how to Export data from an Oracle database using the Datapump Export Utility.  The corresponding Datapump Import utility is also discussed and demonstrated.
This video shows how to configure and send email from and Oracle database using both UTL_SMTP and UTL_MAIL, as well as comparing UTL_SMTP to a manual SMTP conversation with a mail server.

837 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question