Postgresql updating millions of rows mosshart dating


14-Apr-2020 01:18

postgresql updating millions of rows-13

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This is a personal, high end (as of 1 year ago) laptop. With proper indexing, I had something similar happen recently with a table of 3.5 million rows. After a lot of experimenting and frustration, I finally found the culprit.It turned out to be the indexes on the table being updated.So you would want to backup before, and backup again immediately afterward. Table "public.tx_input1_new" (100,000,000 rows) Column | Type | Modifiers ----------------|-----------------------------|---------- blk_hash | character varying(500) | blk_time | timestamp without time zone | tx_hash | character varying(500) | input_tx_hash | character varying(100) | input_tx_index | smallint | input_addr | character varying(500) | input_val | numeric | Indexes: "tx_input1_new_h" btree (input_tx_hash, input_tx_index) Table "public.tx_output1_new" (100,000,000 rows) Column | Type | Modifiers -------------- ------------------------ ----------- tx_hash | character varying(100) | output_addr | character varying(500) | output_index | smallint | input_val | numeric | Indexes: "tx_output1_new_h" btree (tx_hash, output_index) Since you are joining two large tables and there are no conditions that could filter out rows, the only efficient join strategy will be a hash join, and no index can help with that.Someone will give a better answer for Postgres, but here are a few observations from an Oracle perspective which may apply (and the comments are too long for the comment field).

I don't need to have transactional integrity (but of course if the system crashes, there should be no data corruption.Visit Stack Exchange Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Sign up to join this community WITH stops AS ( SELECT id, rank() OVER (ORDER BY offense_timestamp, defendant_dl, offense_street_number, offense_street_name) AS stop FROM consistent.master WHERE citing_jurisdiction=1 ) UPDATE consistent.master SET arrest_id=FROM stops WHERE = stops.id; This query took 39 hours to run.



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