slow Datapump Import

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
monto1Asked:
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tkutherConnect With a Mentor Commented:
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
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monto1Author Commented:
Version is 11202 on RHEL 5.5
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Franck PachotConnect With a Mentor Commented:
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.
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