Andres Freund wrote: > I wondered about that myself. How would you suggest the format to look > like? > ISTM per tuple we'd need: > > * OffsetNumber off > * uint16 infomask > * TransactionId xmin > * TransactionId xmax > > I don't see why we'd need infomask2, but so far being overly skimpy in > that place hasn't shown itself to be the greatest idea?
I don't see that we need the xmin; a simple bit flag indicating whether the Xmin was frozen should be enough. For xmax we need more detail, as you propose. In infomask, are you proposing to store the complete infomask, or just the flags being changed? Note we have a set of bits used in other wal records, XLHL_XMAX_IS_MULTI and friends, which perhaps we can use here. -- Álvaro Herrera http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
