Tomas Vondra <tomas.vondra@2ndquadrant.com> 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