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[DaveL]

What is the suitability of using the MCWS file keys for a local cache?  For a given library will they remain unique over time?  Or are they recalculated each time the server restarts?  If a file is removed from the server can it's key be reused?

[DaveL]

Bump

[Matt]

What is the suitability of using the MCWS file keys for a local cache?

File keys are unique, permanent, and can be used between runs.

For a given library will they remain unique over time?

Yes.

If a file is removed from the server can it's key be reused?

No.  Theoretically there's a corner case where after importing over 4 billion files (even if 3.99 billion have since been removed) the keys will, by design, circle.  I think this can be ignored in practical application.


A final note is that the MCWS browse IDs are _not_ permanent or immutable.  They are generated at run time and only work for a single run of the program.  This is because the browse hierarchy is customizable and can be built from expressions, so that assigning each value a permanent ID doesn't really make sense.