Обсуждение: backup to partitioned table

> On Nov 16, 2022, at 8:56 AM, Erik Serrano <eserranos@gmail.com> wrote:
>
> Hello Guys,
> I have a case that I would like you to help me with.
>
> I have a partitioned table in postgresql version 9,5 to which I select and it returns data perfectly, but when I want
tomake a backup of the table, it only saves the structure without records. 
> It should be noted that I am not making a backup of the structure, but of the data or complete, but it does not back
upthe data anyway. 
> When consulting the administrator, he informs me that it is a partitioned table and that it is always zero, but the
datais in its "daughter" tables and that the select that it returns is the information that is housed in all its
daughtertables. 
>
> Now, given this, I wanted to know if there is any way to make a backup of the table that throws all the data from its
childtables into a flat file. 
>
> Is it possible to perform this action?
> From already thank you very much

You have to dump all the child tables; usually partitions are named reasonably such that a wildcard can do it:

pg_dump -t root_table_name\* > backup.sql

You don't exactly get a "flat" backup, as all the individual tables are included, but you do get it all into one file,
ifthat's good enough for you. 

Hello Guys, 

I have a case that I would like you to help me with.

I have a partitioned table in postgresql version 9,5 to which I select and it returns data perfectly, but when I want to make a backup of the table, it only saves the structure without records.
It should be noted that I am not making a backup of the structure, but of the data or complete, but it does not back up the data anyway.
When consulting the administrator, he informs me that it is a partitioned table and that it is always zero, but the data is in its "daughter" tables and that the select that it returns is the information that is housed in all its daughter tables.

Now, given this, I wanted to know if there is any way to make a backup of the table that throws all the data from its child tables into a flat file.

Is it possible to perform this action?

"David G. Johnston" <david.g.johnston@gmail.com> writes:
> On Wed, Nov 16, 2022 at 8:56 AM Erik Serrano <eserranos@gmail.com> wrote:
>> I have a partitioned table in postgresql version 9,5 to which I select and
>> it returns data perfectly, but when I want to make a backup of the table,
>> it only saves the structure without records.

You realize of course that 9.5 is two years past EOL.

>> When consulting the administrator, he informs me that it is a partitioned
>> table and that it is always zero, but the data is in its "daughter" tables
>> and that the select that it returns is the information that is housed in
>> all its daughter tables.
>> Now, given this, I wanted to know if there is any way to make a backup of
>> the table that throws all the data from its child tables into a flat file.

> I presume you are doing something with pg_dump...don't.

Yeah, pg_dump is chartered to reproduce the original situation, so it
won't help here.

Also, 9.5 didn't have what we would now call partitioned tables.
Presumably this is actually an inheritance tree, which complicates
matters because there's no guarantee that the child tables even have
the same column set as the parent.

> Use a "COPY" command (or psql \copy) to produce the CSV file instead.

You'll need to use "COPY (SELECT * FROM parent_table) TO wherever";
just plain "COPY parent_table" won't do it.

            regards, tom lane