perl; getting a subset of hash keys based on a given value(s)

[Ilya Palagin]

Quoting Ilya Palagin <tux-4CS0UopE6WdBDgjK7y7TUQ at public.gmane.org>:

> Quoting Madison Kelly <linux-5ZoueyuiTZhBDgjK7y7TUQ at public.gmane.org>:
>
> ..
>>
>>   I am hoping there is a better way I could do the 'foreach ...' 
>> section to accomplish what I want. Before this I was creating the 
>> hash keys using '<dev_id>:<parent_dir>:<file_name>:<file_type>' and 
>> then using:
>>
>> foreach ( grep {/^$src_dirs[$i]\:.*[^d]$/} keys %src )
> Looping through hundreds of thousands records won't be fast in perl.  
> Inserting
> those records into a temporary table in a database will allow getting results
> much faster.
Also, if you decide to use a SQL database, don't create a subquery for this
task. "Left join" will be faster.


----------------------------------------------------------------
This message was sent using IMP, the Internet Messaging Program.

--
The Toronto Linux Users Group.      Meetings: http://tlug.ss.org
TLUG requests: Linux topics, No HTML, wrap text below 80 columns
How to UNSUBSCRIBE: http://tlug.ss.org/subscribe.shtml