Storing and calculating with big matrixes

Question

Hello,
we will have to store big matrixes (let's say 3000 x 3000, numeric) and will also multipy matrix a with matrix b.
I would like to get some advice for storing matrixes, and how to do the calculation efficiently.
Have anybody done such things?
thx
Tobias

Answer 1

In order to operate on matrices efficiently, you're going to want to load them from database tables into in PL/SQL arrays, so that you can operate entirely in memory. 3000x3000x4bytes per integer = 36MB, which is probably about on the limit of what you'd want to store in the database UGA.
PL/SQL doesn't support two-dimensional arrays, so you'll need to use a one-dimensional array of one-dimensional arrays. That's pretty much equivalent, but makes the syntax a bit clumsy.
There's bound to be Java code out there for operating with matrices (calculating determinants, multiplying, etc) so you could load those classes into the database, and save yourself the bother of writing a lot of the PL/SQL.
c/PGA/UGA - more accurate.
Message was edited by:
marnold