Hi, On 2023-05-03 19:29:46 +0000, Muhammad Malik wrote: > > 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'.
That's the data generation for the file to be COPYed in. The script passed to pgbench is just something like COPY copytest_0 FROM '/tmp/copytest_data_text.copy'; or COPY copytest_0 FROM '/tmp/copytest_data_binary.copy'; > Also what are the 'seconds' and 'tbl-MBs' metrics that were reported. The total time for inserting N (1024 for the small files, 64 for the larger ones). "tbl-MBs" is size of the resulting table, divided by time. I.e. a measure of throughput. Greetings, Andres Freund
