ITAGAKI Takahiro <itagaki.takahiro@oss.ntt.co.jp> writes:
> PostgreSQL suppots SJIS, BIG5, GBK, UHC and GB18030 as client encodings,
> but we cannot use them as server encodings. Are there any reason for it?
Very much so --- they aren't safe ASCII-supersets, and thus for example
the parser will fail on them. Backend encodings must have the property
that all bytes of a multibyte character are >= 128.
regards, tom lane