Hi list ! I have a simple but big spatial table with approx 93 000 000 lines.
I use QGIS, the open-source GIS software to display this data. To fetch the polygons to draw on QGIS map, QGIS launch a first DECLARE CURSOR query, then fetch data 2000 by 2000. I have seen that this DECLARE has bad perf compared to a simple SQL query : Simple SQL query ===== https://explain.dalibo.com/plan/042bc4dc2449adfe 96ms DECLARE CURSOR for the same query ===== https://explain.dalibo.com/plan/bh83fc0db500a79g# 171 031 ms !! Do you have any clue about this query plan ? Should I add some table specific weight, stats, etc. to help the DECLARE clause to use the indexes as done for the simple SELECT ? Regards Michaël
