| Mechanism followed by imp utility [message #70121] |
Wed, 17 April 2002 02:06  |
anoop
Messages: 15
Registered: October 2001
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Junior Member |
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From where can i know the exact background mechanism involved while doing import.. Acually i wanna know whether all the constraints are diabled at first and the data is imported and then all hte constraints are enabled..
If i am correctly interpretting import mechanism then how can we avoid duplicate entries. I want to use IGNORE=Y
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| Re: Mechanism followed by imp utility [message #70125 is a reply to message #70121] |
Wed, 17 April 2002 10:15  |
Grant
Messages: 578
Registered: January 2002
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Senior Member |
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You can do a full export then list the contents which will tell you the order objects are applied.
exp system/manager file=expdmp.dat ROWS=N FULL=Y
imp system/manager file=expdmp.dat SHOW=Y LOG=expdmp.log
During a full import (no schema objects exist) it will do as you say. Constraints are enabled at the end. If there is existing table data and constraints they are and remain enabled during the import. If you disabled the constraints and did an import you would have duplicate data. The IGNORE option is to ignore errors if objects already exist and continue.
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