As part of a 7.1.2->7.2 data migration process, I resorted to single stop 
mode to see if I could determine the cause of an error (please see my 
following post to this list).

$ less users.txt

COPY "users"  FROM stdin;
\.
--
-- TOC Entry ID 71 (OID 604886)
--
-- Name: "element_name" Type: INDEX Owner: dan
--

$ psql --single-step fp2migration < users.txt
***(Single step mode: Verify 
query)*********************************************
COPY "users"  FROM stdin;
***(press return to proceed or enter x and return to 
cancel)********************
ERROR:  copy: line 1, CopyFrom: Fail to add null value in not null 
attribute name
lost synchronization with server, resetting connection

Without single-stop, it works fine:
$ psql fp2migration < users.txt
$
-- 
Dan Langille
The FreeBSD Diary - http://freebsddiary.org/ - practical examples


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