Hi Adrian, Thank you. The strange things is we only use Python do insert/update/delete and do not run other SQL command. Regards, Max -----Original Message----- From: Adrian Klaver [mailto:adrian.klaver@xxxxxxxxxxx] Sent: Tuesday, 2 May 2017 9:55 AM To: Max Wang <mwang@xxxxxxxxxxxxx>; pgsql-general@xxxxxxxxxxxxxx Subject: Re: all serial type was changed to 1 On 05/01/2017 04:29 PM, Max Wang wrote: > Hi Adrian, > > I checked and found > > is_cycled | f Hmm. A possible cause: test=# insert into serial_test (fld_1) values ('test'); INSERT 0 1 test=# insert into serial_test (fld_1) values ('test2'); INSERT 0 1 test=# insert into serial_test (fld_1) values ('test3'); INSERT 0 1 test=# select * from serial_test_id_seq ; -[ RECORD 1 ]-+-------------------- sequence_name | serial_test_id_seq last_value | 3 start_value | 1 increment_by | 1 max_value | 9223372036854775807 min_value | 1 cache_value | 1 log_cnt | 30 is_cycled | f is_called | t test=# select setval('serial_test_id_seq', 1, false); -[ RECORD 1 ] setval | 1 *** The above would not show up in the logs unless you had log_statement set to 'all' in postgresql.conf ****** test=# select * from serial_test_id_seq ; -[ RECORD 1 ]-+-------------------- sequence_name | serial_test_id_seq last_value | 1 start_value | 1 increment_by | 1 max_value | 9223372036854775807 min_value | 1 cache_value | 1 log_cnt | 0 is_cycled | f is_called | f test=# insert into serial_test (fld_1) values ('test3'); ERROR: duplicate key value violates unique constraint "serial_test_pkey" DETAIL: Key (id)=(1) already exists. > > Regards, > Max > > -----Original Message----- > From: Adrian Klaver [mailto:adrian.klaver@xxxxxxxxxxx] > Sent: Tuesday, 2 May 2017 9:16 AM > To: Max Wang <mwang@xxxxxxxxxxxxx>; pgsql-general@xxxxxxxxxxxxxx > Subject: Re: all serial type was changed to 1 > > On 05/01/2017 04:08 PM, Max Wang wrote: >> Hi Adrian, >> >> Only sequences (id) reset to 1. > > Then per Amitabh Kant's suggestion take a look at the cycle setting for the sequences. > > For sequence named ts_stamp_test_id_seq: > > test=# select * from ts_stamp_test_id_seq ; -[ RECORD 1 ]-+--------------------- sequence_name | ts_stamp_test_id_seq > last_value | 6 > start_value | 1 > increment_by | 1 > max_value | 9223372036854775807 > min_value | 1 > cache_value | 1 > log_cnt | 0 > is_cycled | f > is_called | t > > > You are looking for whether is_cycled = t > > Per the docs: > > https://www.postgresql.org/docs/9.6/static/sql-createsequence.html > > "CYCLE > NO CYCLE > > The CYCLE option allows the sequence to wrap around when the maxvalue or minvalue has been reached by an ascending or descending sequence respectively. If the limit is reached, the next number generated will be the minvalue or maxvalue, respectively. > > If NO CYCLE is specified, any calls to nextval after the sequence has reached its maximum value will return an error. If neither CYCLE or NO CYCLE are specified, NO CYCLE is the default. > " > >> >> Regards, >> Max >> > > > -- Adrian Klaver adrian.klaver@xxxxxxxxxxx -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
