Re: bytea, jdbc, i/o ...

Subject: Re: [GENERAL] bytea, jdbc, i/o ...
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
===
Kenneth Been <kennethb(at)telocity(dot)com> writes:
> Here is the strange behavior:
> For database A, the difference in performance between testing
> locally and testing over the network is negligible; about 5%
> slower over the network. About what I would expect. But for
> database B, the difference is huge; about 35 times slower over
> the network.

That's odd.

> Here is my guess for what is going on:
> Maybe for a local connection the db engine delivers the bytea as
> is, whereas for a remote connection it converts the bytea to a
> string representation, and then Java would have to convert it
> back for the getBytes() method.

I don't believe that for a millisecond; there simply is not any
local/remote discrimination in the backend.

I'm not sure what the problem is, but I think you need to find a
different tree to bark up.

Some other thoughts that come to mind involve network saturation,
routing problems, DNS problems, SSL encryption overhead, multibyte
encoding conversion, yadda yadda...

regards, tom lane

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