Re: COPY command & binary format

[Sameer Kumar <sameer.kumar@xxxxxxxxxx>]

On Tue, May 10, 2016 at 4:36 PM Sameer Kumar <sameer.kumar@xxxxxxxxxx> wrote:

On Tue, May 10, 2016 at 4:26 PM Nicolas Paris <niparisco@xxxxxxxxx> 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

 

Like someone else suggested upthread you can use Binary format in COPY command (default is text)

 

Thanks by advance,

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Best Regards

Sameer Kumar | DB Solution Architect 

ASHNIK PTE. LTD.

101 Cecil Street, #11-11 Tong Eng Building, Singapore 069 533

T: +65 6438 3504 | M: +65 8110 0350 | www.ashnik.com

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Best Regards

Sameer Kumar | DB Solution Architect 

ASHNIK PTE. LTD.

101 Cecil Street, #11-11 Tong Eng Building, Singapore 069 533

T: +65 6438 3504 | M: +65 8110 0350 | www.ashnik.com