As if the name is warning enough that this is one of the coldest places in Alaska, the record low temp for Coldfoot is -74 degrees Fahrenheit, which occurred on January 22, 1971. It looks like a population of around 10 people are able to brave this chilly weather, yet many travel her...
When we change a data block, Oracle inserts an undo record into an undo block to tell us how to reverse that change. But for every change that happens to a block in the database, Oracle creates a redo change vector describing how to make that change, and it creates the vectors before ...