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From Victor Lee <>
Subject Re: Is It a Good Idea to Save Frequently Search Results in Database to Make It Faster?
Date Fri, 25 Nov 2005 03:48:01 GMT
No, I am in the middle of development, actually more like design phase.  So I don't know the
speed of my searches.  The final product will have heavy load on SELECT query if using database
with possibility of joining 2 tables.  I don't worry about speed of searches during light
traffic.  I am worry about what happens during heavy load.  
 For a simple example, if I am doing SELECT a, b, c, d FROM mytable WHERE e = hello in a mysql
database.  And if I am doing the same thing in Lucene by search "hello" in index and make
it return a,b,c,d.  And I do all these continuously to simulate heavy load.  Which one is
more likely to have more queries per second?  I think it would be mysql based on what I read
on their benchmarks on the web.  what do you think?

Erik Hatcher <> wrote: How fast are your searches currently?
 With just a pure using a basic query type like TermQuery, I  
very seriously doubt you'd beat MySQL performance.  What kind of  
Query are you using for your searches?


On 24 Nov 2005, at 17:54, Victor Lee wrote:

> Sorry, actually I meant all search results, not just frequent  
> results.  And there is only one search term per search, it's the  
> stuff that belongs to the search terms change often.
> Victor Lee  wrote:  Hi,
>  I use Lucene to index stuff that are changed very often but don't  
> need to be real-time to searchers. e.g. the search result can be  
> changed couple times per minute, but I only need to show the change  
> every 5 minutes or so. Is it a good idea to save the search result  
> to a database like mysql db, so that searches will load from db  
> directly rather than doing the same search over and over again?  
> Then after 5 minutes, the system will do the actual search again  
> and then save search result to the db for next 3-5 minutes' searches?
>  Will it make the server handle heavy load better? Since most of  
> the access goes into the database server rather than the webserver  
> with java in backend. Of course, there will be more to implement  
> and maintain.
>  Many thanks.
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