Peter Eisentraut wrote:Won't the substring function bring the whole thing into memory in the backend before it pass you the piece you need? Let's assume I want to stream 4k at a time of a 40mb image, that's a whole lot of byte swapping if that's the case.Am Sonntag, 28. November 2004 12:33 schrieb Thomas Hallgren:
Hmm, ok. But there's no way to stream them in and out from disk. From what I can see, you have to bring all of it into memory. Not so ideal perhaps if you want to provide streaming media for thousands of users.
You can use the substring function to read the pieces you need.
Not if the column is storage type EXTERNAL. See a past discussion here: http://archives.postgresql.org/pgsql-general/2003-07/msg01447.php
How do you handle writes without first creating the whole image in memory?
You can't currently, but it would be a nice addition ;-)
I agree with Peter -- I think effort is better spent improving bytea.
BTW, someone on GENERAL just started a very similar thread ("implementing a lo_truncate operation, and possibly a lo_size"). I've cc'd him here.
Joe
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