Im in the middle of Kytes new tuning book. He states that google uses a query similiar
to this to return web pages in their search function:
select /*+ FIRST_ROWS */ b.*
from ( select a.*, a.rownum
from (your query here) a
where rownum < <<pick max number of rows you want in a batch >>)
where rownum > <<will start with 1 and be max + 1 for each 'page' >>
If they are using oracle to do this, how do they get the estimated number of total
results? Is it from 'cardinality'? Do you know which data dictionary that comes from?
explain plan is costly so they cant be using that.
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