Another trick is to reverse the domain when you store it. For example instead of storing
www.facebook.com, store it as com.facebook.www. That way you write a query like:
WHERE domain LIKE 'com.facebook%'
This will use the index, since you're not using a wildcard at the beginning of the string,
and the results will include all subdomains for the given domain you're looking for.
From: Alexander Kolesen [mailto:kolesen_a@stripped]
Sent: Saturday, August 01, 2009 11:10 AM
Subject: Re: Table advice.
Your query performs a full table scan, because if you match text with '%...' wildcard,
MySQL can't using index. Try to use external full-text
search engines like Sphinx (http://www.sphinxsearch.com/) or Lucene
> I have a database that I am (will) be using to track URL's. The table
> structure looks like this:
> CREATE TABLE event
> eid INT UNSIGNED NOT NULL AUTO_INCREMENT,
> timestamp INT(10) UNSIGNED NOT NULL DEFAULT 0,
> ip INT(10) UNSIGNED NOT NULL DEFAULT 0,
> fqdn VARCHAR(255),
> domain VARCHAR(63),
> tld VARCHAR(63),
> action VARCHAR(4),
> request TEXT,
> referrer TEXT,
> client VARCHAR(255),
> INDEX eid (eid),
> INDEX timestamp (timestamp),
> INDEX ip (ip),
> INDEX fqdn (fqdn),
> INDEX domain (domain),
> INDEX tld (tld)
> The is no real logic behind the indexes, the table was hobbled
> together looking at examples. Currently I am trying queries on about
> 300 million records and the results are pretty crappy. for example, a
> query like this:
> select domain,count(domain) as count from event where domain like
> '%facebook%' group by domain order by count desc;
> takes about 5 minutes to complete.
> Most of the queries will be like that above but probably with
> additional filters like date constraints or IP constraints or a
> mixture of both. I can also see searches through the requests for
> filetypes etc.
> Any suggestions or comments would be appreciated.
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