Is ST_GeomFromText better than providing direct geometry?
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I have been working with postgis recently,and in my query if I use ST_GeomFromText it execute faster than running a sub-query to get geom. I thought ST_GeomFromText will be more expensive but after running many tests every time I got the result faster, my question Is there any explanation behind this? because for me getting the geom directly in sub-query is better than getting geom as text then added as GeomFromText. Thanks
Answer:
You should run an "explain analyze" on both queries. As with most performance-related questions...
Sara at Geographic Information Systems Mark as irrelevant Undo
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