Re: refactoring relation extension and BufferAlloc(), faster COPY

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От Muhammad Malik
Тема Re: refactoring relation extension and BufferAlloc(), faster COPY
Дата
Msg-id SJ0PR17MB58412FDEE3DCAC0C23C062ABA66C9@SJ0PR17MB5841.namprd17.prod.outlook.com
обсуждение исходный текст
Ответ на Re: refactoring relation extension and BufferAlloc(), faster COPY  (Andres Freund <andres@anarazel.de>)
Ответы Re: refactoring relation extension and BufferAlloc(), faster COPY
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Дерево обсуждения

> I use a script like:

> c=16;psql -c 'DROP TABLE IF EXISTS copytest_0; CREATE TABLE copytest_0(data text not null);' && time /srv/dev/build/m-opt/src/bin/pgbench/pgbench -n -P1 -c$c -j$c -t$((1024/$c)) -f ~/tmp/copy.sql && psql -c 'TRUNCATE copytest_0'

> >[1] COPY (SELECT repeat(random()::text, 5) FROM generate_series(1, 100000)) TO '/tmp/copytest_data_text.copy' WITH (FORMAT test);
> >[2] COPY (SELECT repeat(random()::text, 5) FROM generate_series(1, 6*100000)) TO '/tmp/copytest_data_text.copy' WITH (FORMAT text);

When I ran this script it did not insert anything into the copytest_0 table. It only generated a single copytest_data_text.copy file of size 9.236MB. 
Please help me understand how is this 'pgbench running COPY into a single table'. Also what are the 'seconds' and 'tbl-MBs' metrics that were reported.

Thank you,
Muhammad


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