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Shared Document Collections 
Use this IdeaSpace to post ideas about Domino Designer.

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: 8
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: Domino Designer
: view, shared, selection, performance
: Alois Gruber1701 29 Dec 2007
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: / Email
this would rather fit into various idea spaces since it touches the storage system of views. Within almost every database I know, many views have the same selection formula as other views, resulting in the same collection of documents. As far as I know these collections are all evaluated and stored separately by the indexer. Notes could either "intelligently" analyze the selection formulas and then only store "one" collection per "unique" selection formula, or like "shared columns" let the developer decide to use a "shared selection formula". The same should be possible for the various collations within a "shared view collection".
 
Especially within big databases this should result in less space used and improved performance. In my opinion it should be feasible to integrate it with backward compatibility since the creation of the collections is done locally on each machine.
 



1) Thomas Bahn3669 (29 Dec 2007)
I don't think, that the collection (i. e. list) of documents takes a lot of disk space, but the contents of the view columns and their sort orders.
2) Alois Gruber1701 (29 Dec 2007)
yes I agree, but it would be possible to store "all" columns used by various views based on the same collection in a single place and use a kind of internal pointers.

Regarding the effect, the primary target is performance and this should be improved when the indexer has to apply selection filters fewer times. I would even abandon the single storage idea, if at least the indexer would internally reuse/copy collections when rebuilding indexes, based on identical selection formulas.
3) Harkpabst Meliantrop3243 (02 Jan 2008)
It has been suggested, to store the NIF in a separate file. I assume, that there is more to gain from this approach alone, but it could also be a starting point to change the way collections are stored.
4) Julian Woodward1819 (29 Jan 2008)
If the indexer were optimised to index views that have the same selection formula at the same time, so as to not have to re-visit the underlying documents, would that make sense?
From an implementation standpoint, it might be easier to do this for views that actually share a selection formula as per Devin's suggestion:
{ Link }
5) Starrow Pan4324 (19 Feb 2008)
@1 Agree to Thomas. Even I don't think Domino stores the "shared document collection". It just search the database, get the collection and build the view index.
If we reuse this collection, does that mean Domino should build the index of views sharing the collection at the same time? I think that's a unnecessary limitation.










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