Craig James <craig_james@emolecules.com> writes: > If I do: > begin; > update some_table set foo = newvalue where a_bunch_of_rows_are_changed; > analyze some_table; > rollback; > does it roll back the statistics? (I think the answer is yes, but I need to be sure.) Yes --- ANALYZE doesn't do anything magic, just a plain UPDATE of those rows. (You could have easily tested this for yourself...) regards, tom lane ---------------------------(end of broadcast)--------------------------- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match