Re: [EXTERNAL] timescaledb backup, pg_dump warnings

HI – the messages that say “pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied" are noise. My understanding is that is messaging that is no longer applicable, but test it for certain. You could check here: https://github.com/timescale/timescaledb

 

The circular constraints  has been an issue since December 2019 https://github.com/timescale/timescaledb/issues/1581. I don’t have a resolution, except to follow the instructions and test.

Regards,

Phil godfrin

 

From: Victor Sudakov <vas@sibptus.ru>
Sent: Monday, May 3, 2021 10:49 PM
To: pgsql-admin@lists.postgresql.org
Subject: [EXTERNAL] timescaledb backup, pg_dump warnings

 

Use caution when interacting with this [EXTERNAL] email!

Dear Colleagues,

Is anyone using the Timescaledb extension? I've read
https://docs.timescale.com/latest/using-timescaledb/backup, it says that
restoring data from a backup currently requires some additional
procedures. I'm fine with that.

However, the actual pg_dump produces multiple warnings, do they mean that the
timescaledb database is corrupt, or the dump will come out corrupt?
Below is a sample of the warnings (Postgres 12.6, Timescaledb 2.2.0):

$ pg_dump -Fc -U postgres -f zabbix.dump -d zabbix
pg_dump: warning: there are circular foreign-key constraints on this table:
pg_dump: hypertable
pg_dump: You might not be able to restore the dump without using --disable-triggers or temporarily dropping the constraints.
pg_dump: Consider using a full dump instead of a --data-only dump to avoid this problem.
pg_dump: warning: there are circular foreign-key constraints on this table:
pg_dump: chunk
pg_dump: You might not be able to restore the dump without using --disable-triggers or temporarily dropping the constraints.
pg_dump: Consider using a full dump instead of a --data-only dump to avoid this problem.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.
pg_dump: NOTICE: hypertable data are in the chunks, no data will be copied
DETAIL: Data for hypertables are stored in the chunks of a hypertable so COPY TO of a hypertable will not copy any data.
HINT: Use "COPY (SELECT * FROM <hypertable>) TO ..." to copy all data in hypertable, or copy each chunk individually.




--
Victor Sudakov VAS4-RIPE
http://vas.tomsk.ru/
2:5005/49@fidonet