| From: | Muhammad Malik <muhammad(dot)malik1(at)hotmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Melanie Plageman <melanieplageman(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: refactoring relation extension and BufferAlloc(), faster COPY |
| Date: | 2023-05-03 19:29:46 |
| Message-ID: | SJ0PR17MB58412FDEE3DCAC0C23C062ABA66C9@SJ0PR17MB5841.namprd17.prod.outlook.com |
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| Lists: | pgsql-hackers |
> 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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