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However , unless you have a special reason for doing this ( such as using OIDs as keys in tables ) , do n't do it . The first The Leader of the Future , published in 1996 , has become a standard in the field , breaking new ground in leadership literature to establish itself as one of the most widely distributed , bestselling edited collections on the topic . This module implements a simple `` standard '' lexical analyzer , presented as a function from character streams to token streams . Although the minimum required memory for running Postgres is as little as 8MB , there are noticable improvements in runtimes for the regression tests when expanding memory up to 96MB on a relatively fast dual-processor system running X-Windows . Thus , saccades are guided by our experience , guesses , objectives , and strategies ,2 as well as by overt visual stimulation , even though their motoric details are largely independent of their purpose . This tutorial is presented as the transcript of a session with the interactive system : lines starting with # represent user input ; the system responses are printed below , without a leading # .