On 26/02/09 18:37, Wouter Boasson wrote:
In response to:
Hello,
reading this thread, and being sometimes concerned with large vector
files (associated with big related tables), I wonder if it's worth
manually creating indexes (on cat field) : can it be a effective way to
speed up queries, or is the kink elsewhere, at the geometric level (data
handled by grass, not the linked DBMS) ?
Thank you,
Vincent
The problems with querying and topological operations must be at the
geometric level (e.g. click an area to see the attributes using v.what, or
cleaning operations).
Yes, querying the geometries is very slow currently because of the fact
that the spatial and topological index is kept in memory and not on
file, so every time you launch an interactive query, it has to rebuild
it which is very slow on large vectors. See
http://josef.fsv.cvut.cz/WIKI/grass-osgeo/index.php/GRASS_7_ideas_collection#Radim.27s_TODO_list
Moritz
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