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DB Import with same schema but duplicate keys [message #452039]

Mon, 19 April 2010 12:40

atheis
Messages: 7
Registered: April 2010

Junior Member

I have two oracle 9i databases A and B with complete equal schema.
Only the data is different. I want to import all table data from A to B. The problem is that there are duplicate primary keys. Therefore I want to insert data with new primary keys (all referencing tables are concerned too). Are there any existing tools/solutions?

[Updated on: Mon, 19 April 2010 12:41]

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Re: DB Import with same schema but duplicate keys [message #452041 is a reply to message #452039]

Mon, 19 April 2010 12:49

Michel Cadot
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Truncate the tables in target databaase before importing.

Regards
Michel

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Re: DB Import with same schema but duplicate keys [message #452042 is a reply to message #452041]

Mon, 19 April 2010 12:56

atheis
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Registered: April 2010

Junior Member

but I want to keep the data in database B. Truncate will delete the tables.

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Re: DB Import with same schema but duplicate keys [message #452043 is a reply to message #452042]

Mon, 19 April 2010 12:57

Michel Cadot
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Import in another schema then use SQL to import in the original one using the sequence of this latter.

Regards
Michel

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Re: DB Import with same schema but duplicate keys [message #452159 is a reply to message #452043]

Tue, 20 April 2010 07:20

atheis
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Registered: April 2010

Junior Member

ok, but is there a generic way to do this?

It is a lot of work to update all foreign keys. I am looking for a generic solution.

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Re: DB Import with same schema but duplicate keys [message #452160 is a reply to message #452039]

Tue, 20 April 2010 07:25

cookiemonster
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Registered: September 2008
Location: Rainy Manchester

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Design your system so you don't have to re-assign keys on import?

I doubt you'll find any generic solution as most people will avoid ever getting in this mess in the first place.

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Re: DB Import with same schema but duplicate keys [message #452161 is a reply to message #452160]

Tue, 20 April 2010 07:26

Littlefoot
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How about inserting via a database link? Doing so, you'd have control over what to insert and how.

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Re: DB Import with same schema but duplicate keys [message #452162 is a reply to message #452160]

Tue, 20 April 2010 07:30

atheis
Messages: 7
Registered: April 2010

Junior Member

sure, but real life is different from theory Wink

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Re: DB Import with same schema but duplicate keys [message #452163 is a reply to message #452039]

Tue, 20 April 2010 07:34

cookiemonster
Messages: 13963
Registered: September 2008
Location: Rainy Manchester

Senior Member

And sometimes in real life you discover that there is a really good reason for the theory - this'd be one of them.

Bottom line, you're going to have to write a lot of SQL to sort the mess out, either after importing into another schema as Michel suggested, or by skipping the import and using DB links as Littlefoot suggested.

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Re: DB Import with same schema but duplicate keys [message #452164 is a reply to message #452161]

Tue, 20 April 2010 07:37

atheis
Messages: 7
Registered: April 2010

Junior Member

I think my problem cannot be solved by database links, because this mechanism doesn't solve the problem of duplicate PK's and corresponding FK's

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Re: DB Import with same schema but duplicate keys [message #452165 is a reply to message #452159]

Tue, 20 April 2010 07:48

Michel Cadot
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atheis wrote on Tue, 20 April 2010 14:20

ok, but is there a generic way to do this?

It is a lot of work to update all foreign keys. I am looking for a generic solution.

It is a generic way to do it!
In a futur version you can use Data Masking option (which can be used for other things than masking data), it is a paying option.
So you can build a similar product and sell it but you will have nothing for free, as you said there is work to do it.

Regards
Michel

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Re: DB Import with same schema but duplicate keys [message #452183 is a reply to message #452163]

Tue, 20 April 2010 08:31

atheis
Messages: 7
Registered: April 2010

Junior Member

yes it's a mess and I am the lucky one who hast to fix everything Mad

ok, I didn't understand what you meant with database links Smile

Now I see that it can be a workaround.

I am just reading something about oracle (advanced) data replication (link see below)

Oracle Data Warehouse can maybe solve the problem too..
Furthermore there is a package called

# DBMS_REPCAT.ADD_DELETE_RESOLUTION - DUP_VAL_ON_INDEX

still investigating Smile

links:
-----------------------
http://www.orafaq.com/wiki/Advanced_Replication_FAQ#What_is_the_difference_between_BASIC_and_ADVANCED_replication.3F

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Re: DB Import with same schema but duplicate keys [message #452185 is a reply to message #452165]

Tue, 20 April 2010 08:40

atheis
Messages: 7
Registered: April 2010

Junior Member

What do you mean with future version concerning data masking option? When would it be available?

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Re: DB Import with same schema but duplicate keys [message #452200 is a reply to message #452185]

Tue, 20 April 2010 10:42

Michel Cadot
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Latest 10.2.0.4 with Grid Control and 11g with an API (iirc).
I meant future for you as you are in 9i.

Regards
Michel

[Updated on: Tue, 20 April 2010 10:43]

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