"drum.lucas@xxxxxxxxx" <drum.lucas@xxxxxxxxx> writes:
> So, the new plan is:
>
> 1 - Select 50.000 rows and gives it a batch number.
> 2 - Select *MORE* 50,000 rows and gives it a *NEW* batch number.
> 3 - Select *MORE* 50,000 rows and gives it a *NEW* batch number.
Why so complicated? Here's a simplified example:
CREATE TABLE mytable (
id serial NOT NULL,
payload int NOT NULL,
batch_number int NULL,
PRIMARY KEY (id)
);
INSERT INTO mytable (payload)
SELECT x FROM generate_series(1, 2000) AS g(x);
\set batchSize 600
UPDATE mytable
SET batch_number = (id % (SELECT count(*) FROM mytable) / :batchSize) + 1;
SELECT batch_number, count(*) AS cnt
FROM mytable
GROUP BY batch_number
ORDER BY batch_number;
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