devik@cdi.cz wrote:
> Hello,
> Why is there cmax in tuple ? cxxx is used to determine
> if tuple was inserted/deleted by current command or
> past command. Because one command can't both insert
> and delete the same tuple, only something like "cupd"
> might be needed and flag which tells you whether cupd
> is time of insert or delete. This saves 4byte from
> header ..
>
If a tuple was inserted and updated in current transaction,
how could we judge if the tuple was valid for a given
ScanCommandId ?
However there could be other improvements.
Regards.
Hiroshi Inoue