On 29/11/10 00:46, Mario Splivalo wrote:
This is the slow part:
INSERT INTO drones_history (sample_id, drone_id, drone_log_notice,
drone_temperature, drone_pressure)
SELECT * FROM tmpUpdate;
For 100 rows this takes around 2 seconds. For 1000 rows this takes
around 40 seconds. For 5000 rows this takes around 5 minutes.
For 50k rows this takes around 30 minutes! Now this is where I start
lag because I get new CSV every 10 minutes or so.
Have you created indexes on drones_history(sample_id) and
drones_history(drone_id)? That would probably help speed up your INSERT
quite a bit if you have not done so.
Also it would be worthwhile for you to post the output of:
EXPLAIN ANALYZE INSERT INTO drones_history (sample_id, drone_id,
drone_log_notice, drone_temperature, drone_pressure)
SELECT * FROM tmpUpdate;
to the list, so we can see what is taking the time.
Cheers
Mark
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