"Heikki Linnakangas" <[EMAIL PROTECTED]> writes: > Tom Lane wrote: >> Then you don't remember far enough --- either the HeapTupleHeader change >> or the varvarlena change would be enough to prevent that. For that >> matter, the pd_flags header field that the patch is already relying on >> is new for 8.3.
> Yeah, those changes will need to be dealt with in the conversion. But > none of the changes this far have increased the on-disk size. Adding a > new field to page header means that in some corner cases it might not be > possible to convert a page from old format to the new one because the > data no longer fits. Counting on my fingers, it seems that the 4-byte savings in HeapTupleHeader size would guarantee that adding 4 bytes to the page header wouldn't kill you. regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 7: You can help support the PostgreSQL project by donating at http://www.postgresql.org/about/donate