On Fri, 5 Jul, 2024, 1:44 pm David Rowley, <dgrowleyml@xxxxxxxxx> wrote:
On Fri, 5 Jul 2024 at 19:53, Lok P <loknath.73@xxxxxxxxx> wrote:
> As David suggested it breaks if a row exceeds the 8k limit I. E a single page size , will that still holds true if we have a column with JSON in it?
You wouldn't be at risk of the same tuple length problem if you
reduced the column count and stored the additional details in JSON.
Each varlena column is either stored in the tuple inline, or toasted
and stored out of line. Out of line values need an 18-byte pointer to
the toasted data. That pointer contributes to the tuple length.
David
Got it. Thank you very much.
So there would be performance overhead with JSON and we need to validate that carefully, if at all going in that direction.
However out of curiosity, if the roasted/compressed component or column which is JSON itself goes beyond 8k post compression, will it break then?
