Google certainly doesn't use an Oracle database. They just wouldn't get the performance
that they achieve currently.
See this link on Google's architecture : http://www.computer.org/micro/mi2003/m2022.pdf
Hemant
At 05:44 AM 26-09-03 -0800, you wrote:
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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Hemant K Chitale Oracle 9i Database Administrator Certified Professional My personal web site is : http://hkchital.tripod.com
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