Re: creating indexes on a table already containing data

[Angelo Zanetti]

Dan Nelson wrote:

>In the last episode (Oct 03), Angelo Zanetti said:
>  
>
>>I've got a database that has a few thousand rows, I've noticed that
>>some of the search queries (especially the large ones) are taking
>>some time. Im looking at adding indexes to my tables in order to
>>speed up the data retrieval.
>>
>>My question is as follows: At this point in time if I add the indexes
>>to the various tables should I see immediate results in the query
>>times or do I have to wait for new information to enter the database
>>(only new data gets indexed?)
>>
>>When does the data actually get indexed? Is it when its inserted or
>>continually when regards are inserted or updated in the database?
>>    
>>
>
>When you add an index, Mysql builds a complete index of your table
>immediately.  For a few thousand rows it should take under a minute. 
>The index will automatically be updated as you insert rows or change
>existing ones.
>
>  
>

thanks Dan and Dan.

I will have a look at the mysql site. However I checked and there are 
600 rows approx in the database.
The query im running has 3 subselect statements and takes quite a while, 
would you say that indexing wouldn't help as there arent that many rows 
in the database currently? And therefore consider rewriting parts of the 
statement?
I will add the indexes as good measuse anyway.

TIA

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Angelo Zanetti
Systems developer
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