Tomas Vondra <> writes:
> On 03/02/2016 03:18 PM, Daniel Verite wrote:
>> However, getting it to the client with \copy big2 to 'file'
>> still produces the error in psql:
>> lost synchronization with server: got message type "d"
>> and leaves an empty file, so there are more problems to solve to
>> go beyond 2GB text per row.

> My guess is this is a problem at the protocol level - the 'd' message is 
> CopyData, and all the messages use int32 to define length. So if there's 
> a 2GB row, it's likely to overflow.

I'm too lazy to check the exact wording, but I don't think there's a hard
and fast promise in the protocol doc that one CopyData message == one row.
So we could probably subdivide a very wide line into multiple messages.

                        regards, tom lane

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