Some Googling reveals that they've discussed 64-bit TXID since 2005, but resisted due to performance and complexity concerns. The two biggest discussion thread

Some Googling reveals that they've discussed 64-bit TXID since 2005, but resisted due to performance and complexity concerns. The two biggest discussion threads w/Tom Lane seem to be: 2005 http://postgresql.nabble.com/Re-PATCHES-lastval-td2213404.html http://postgresql.nabble.com/Re-PATCHES-lastval-td2213404.ht... 2012 http://postgresql.nabble.com/PostgreSQL-64-Bit-XIDs-Transaction-IDs-td5588598.html http://postgresql.nabble.com/PostgreSQL-64-Bit-XIDs-Transact...