Re: How ORA-1555 reported by expdp solved by insert over network

If the table is subject to updates involving large numbers of rows you may have 
experienced delayed  block cleanout during the expdp session; once those blocks 
are 'cleaned' a subsequent select won't suffer the same fate.

David Fitzjarrell



________________________________
From: sundar mahadevan <sundarmahadevan82@xxxxxxxxx>
To: Oracle-L@xxxxxxxxxxxxx 
Sent: Friday, April 20, 2012 10:56 AM
Subject: How ORA-1555 reported by expdp solved by insert over network

Hi All,
Greetings. Recently we were trying to export a frequently updated table
using datapump with flashback_scn. It failed with ORA-1555. But when we
tried to insert into table as select * from table@source as of scn, it
worked. So what was happening in the background? I was expecting to receive
ORA-1555 with the second approach as well since the select statement is
executed on the source. Thanks in advance.

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