To: pgsql-admin@lists.postgresql.org
From: John Scalia <jayknowsunix@gmail.com>
Subject: pg_dump weirdness
Message-ID: <492eb0ca-d43e-e732-61bd-17293fff431a@gmail.com>
Date: Fri, 5 Nov 2021 15:10:21 -0400
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I ran a pg_dump for a colleague, as he needs to move some data into a 
new database. I ran the command as:

pg_dump -h original_server -t original_schema.table_name -U user -W 
dbname > table_name.sql

after the dump was completed with no errors, I went into the target 
instance, and truncated the target table. I also had to do a sed 
operation to change the schema name in the dump file for the schema in 
the target. I verified that sed properly modified the file. Now, after 
all this, I used:

psql -h target_server -U user newdbname < table_name.sql

This loaded with a handful of warnings, like table already exists, the 
sequence already exists, and some privileges could not be set. After 
those warnings it ran for more than 1/2 hour to load the table. The 
problem is that after this was all done. I went back into the target 
instance, and checked the newly loaded table. There was nothing in it, 
i.e., 0 rows.

The pg_dump and the output file claim the pg_dump version was 12.6, 
while the server it ran against was 11.9. Both instances are AWS RDS 
Aurora-PostgreSQL ones. Any ideas why there was no data in the table? 
Other than on inputting it using psql, there were no other errors.

--jay