On 22 Sep 2009, at 18:39, Elf wrote:
2009/9/22 Ning Tan <[email protected]>:
On Tue, Sep 22, 2009 at 11:43 AM, Elf <[email protected]> wrote:
Do not use emit(something, doc), prefer to use include_docs=true
(so,
emit(something, something_less_than_large_document) when
requesting a
view.
Can you elaborate on this? What if I have a mostly read database
(i.e.
I don't care too much about view update time and space limitation,
etc) and want to get to the data very quickly? Having to use
include_docs means internally I need to query a second b-tree to get
the data, right?
So, I will recommend you to store documents in a view :-)
But topicstarter is novice in couchdb, so I can't recommend that
tactics for it.
Also, I think, second b-tree lookup is not a bottleneck. Bottleneck
may be disk or network bandwidth, so... It's need to test your
environment, not to guessing.
It'd be a secondary b-tree lookup per view result row. So this is a
significant hit
on view read time). Emitting the full doc is also a significant hit
(on view index
time). Emitting only the values you need from a view is best for both
cases :)
Cheers
Jan
--
