UpdateGeometrySRID and low disk space

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I have imported a 508GB DB with unknown SRID with ogr2ogr, hence my geometry SRID is 900914.

Now I'd like to run

SELECT UpdateGeometrySRID('contours','wkb_geometry',3857);However, I'm running low on disk space (~300GB left) and it seems that UpdateGeometrySRID consume everything before failing.

Is there a way to run things more progressively ?



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