POSTGRESQL 9.6 COPY created file bigger than the table -


im trying export oracle table local postgresql dump via copy command : 

\copy (select * remote_oracle_table) /postgresql/table.dump binary;

the oracle table`s size 25g. howvere, copy command created 50g file. how possible ?

i'm capable of selecting remote oracle table because have oracle_fdw extension.

a few factors @ work here, including:

  • small numbers in integer , numeric fields use more space in binary format text format;

  • oracle stores table degree of compression, binary dump won't have.

you'll find if compress resulting dump it'll lot smaller.


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