Hello,
While testing "COPY/ FREEZE" feature, I've found a weird issue, by which I am unable to actually freeze the rows/tables when using psql 9.6. Or, at least, so it looks when inspecting 'xmin'..
Here is the actual (failing) output from running a simple COPY/FREEZE snippet against postgres 9.6.2 (x86_64) on CentOS:
# /usr/pgsql-9.6/bin/psql -U postgres -h localhost
postgres=# BEGIN;
BEGIN
postgres=# CREATE TABLE da (text text);
CREATE TABLE
postgres=# COPY da FROM STDIN WITH (DELIMITER ',', FREEZE);
sample
\.
COPY 1
postgres=# COMMIT;
COMMIT
postgres=# select xmin,xmax from da;
xmin | xmax
—----+------
1679 | 0
(1 row)
However, this same snipped when run against 9.3.16, actually works, and reports the expected xmin=2 value:
# /usr/pgsql-9.3/bin/psql -U postgres -h localhost
postgres=# BEGIN;
BEGIN
postgres=# CREATE TABLE da (text text);
CREATE TABLE
postgres=# COPY da FROM STDIN WITH (DELIMITER ',', FREEZE);
sample
\.
COPY 1
postgres=# COMMIT;
COMMIT
postgres=# select xmin,xmax from da;
xmin | xmax
—----+------
2 | 0
(1 row)
Both databases are just fresh installed, have no other users/sessions concurrently, and have the same (default/basic) configuration.
Also, quite a similar issue happens when issuing a "VACUUM FREEZE da" after COPY (w/o freeze): on 9.3 rows are frozen (xmin=2), while on 9.6 it just like if VACUUM FREEZE is simply ignored.. :?
Regards
Danilo Olivares
