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October 5th, 2009 01:00

Few Questions about Centera

Hi All,

I have following two requirements

1) Once the document is sent to EMC Centera, can we create next version of it and continue editing it and once this version meets the archival criteria, this version should also go to EMC Centera

2) Once the content of the document is sent to Centera can the metadata of the document be modified?

Regards,
Nitesh

October 5th, 2009 04:00

Hi Nitesh

If you talk about DQL I assume you're using Documentum.

In Documentum you should be able to define your documents to be archived in a given document status like released. This would establish a copy to Centera.

A copy of the document would still be kept in the cache (filesystem) of DCTM. This copy can be changed, updated, metadata changed. Once the new version reaches a released status again it will be pushed to Centera again.

Documentum would take care of the versioning. Centera really only provides the archive capacity. Object handling is the task of the archive application.
I'm not a Documentum guy but have a couple of customer that are using Documentum on the systems we manage. As we develop our own applications on Centera some knowledge about the API exists as well.

Best regards, Holger

October 5th, 2009 02:00

Hi Jain

Your application is free to copy a "commited" version of a document to Centera and store that reference. Then you can continue to work on your document and after a new approval cycle put the next "commited" version to Centera.

Once an object is sent to Centera the CDF and Object cannot be changed anymore. You can update metadata in your application database but the object on Centera will remain. If you want to update something you need to read the clip, modify it and then store the new version (see above).

Best regards, Holger

9 Posts

October 5th, 2009 03:00

Thanks Holger,

Does this mean that means that once a document is in centera we can not create any additional versions using checkin/checkout mechanism and have to follow the copy path.

Also can we update the metadata of archived document in centera through DQL and not Oracle end.

Regards,
Nitesh

124 Posts

October 5th, 2009 06:00

Centera stores fixed content. The content address (Centera is "CAS" Content Addressed Storage") is based off of the md5sum hash of the stored object. If one bit of this data changes, the md5sum hash changes. As such, you cannot change stored content without rewriting the object which will produce new content addresses that will be stored and referenced by the application reading/writing to the Centera.

To Centera, everything is an object and is treated the same. It is the application that references these objects that bring any sort of meaning to them (draft1, draft2, released version etc)
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