Re: postgres block_size problem

Bhujbal, Santosh wrote:
> Hi All,
>
> We were getting the following error on executing a COPY command on
> postgres8.2.0.
>
> SQL execution failed, Internal error. SQL Statement: (COPY command failed with error: ERROR: row is too big: size 8200, maximum size 8136)
>
> So, in order to fix the error we tried increasing the block size to 16k
> and recompiled the postgres library. The problem at hand was resolved
> with the new postgres library and we were now able to populate data for
> the mentioned query successfully. However, this experiment fails when we
> tried to run the new postgres on data directory generated with 8k block
> size which is likely to occur during an upgrade with postgres log
> showing the following error:
>
>
>
> 2008-12-30 14:57:33 IST DETAIL: The database cluster was initialized
> with BLCKSZ 8192, but the server was compiled with BLCKSZ 16384.
>
> 2008-12-30 14:57:33 IST HINT: It looks like you need to recompile or
> initdb.
>
>
>
> What could be the possible solution to this?

If you want to migrate data from an 8k block size data directory to a
16k block size data directory, you need to do a dump and restore, just
like on a major version upgrade.