How to track query progress in PostgreSQL?

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I found a good answer here: Tracking progress of an update statement

The trick is to first create a sequence (name it as you like):

CREATE SEQUENCE query_progress START 1;

Then append to your query’s WHERE part:

AND NEXTVAL('query_progress')!=0

Now you can query the progress:

SELECT NEXTVAL('query_progress');

Finally don’t forget to get rid of the sequence:

DROP SEQUENCE query_progress;

Note that this will most likely make your query run even slower and every time you check progress it will additionally increment the value. The above link suggested creating a temporary sequence but PostgreSQL doesn’t seem to make them visible across sessions.

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