I found this hard to comprehend upon the first reading:
When doing a data only dump, pg_dump emits queries to disable triggers on
user tables before inserting the data and queries to re-enable them after
the data has been inserted. If the restore is stopped in the middle, the
system catalogs may be left in the wrong state.
I first thought that pg_dump issues a command to disable triggers. What
it meant, I think, is that pg_dump includes those commands within the
output. Those commands are actually processed/issued by pg_restore (or
perhaps psql in a 'psql mydb < mydump.sql' fashion.
If my impressions are correct, then I think the following is more
appropriate:
When doing a data-only dump, pg_dump will output data insert statements
that are wrapped with a pair of commands to first disable and then re-enable
triggers on user tables. If the restore is stopped in the middle
of the inserts, the system catalogs may be left in the wrong state.
NOTE: I am not sure that "catalogs may be left in the wrong state" is the
correct phrase to use.
cheers
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