Re: COPY command & binary format

On Tue, May 10, 2016 at 4:26 PM Nicolas Paris <niparisco@gmail.com> wrote:

Hello,

What is the way to build a binary format (instead of a csv) ? Is there specification for this file ?
http://www.postgresql.org/docs/9.5/static/sql-copy.html 

Could I create such format from java ?

You can use COPY JDBC API to copy to STDOUT and then compress it before you use usual Java file operations to write it to a file. You will have to follow the reverse process while reading from this file and LOADING to a table.

But why would you want to do that?

 

I guess this would be far faster, and maybe safer than CSVs

I don't think assumption is right. COPY is not meant for backup, it is for LOAD and UN-LOAD. 

What you probably need is pg_dump with -Fc format.

http://www.postgresql.org/docs/current/static/app-pgdump.html

 

Thanks by advance,

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