From time to time the topic of indexes arises.  Here is a practical example, 
using PostgreSQL 9.3

I was running this query:  select * from file where fileindex = 23495

It took a long time.

I added this index: create index file_fileindex on file(fileindex)

The query takes a few seconds.

Background:

268.1 million rows.

Database size:

Before index: 100GB
After index: 106GB

I am willing to sacrifice that space.  I’m also willing to bed that table 
updates won’t be affected by much at all.  We’ll find out on 4 Jan when the 
full backups are run.

Skeptics are welcome to contact me for confirmation/denial after that.  :)

— 
Dan Langille
http://langille.org/






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