i have a table with several thousand records. i want to know if adding
an index will improve things, example:
-------------------------------------
| id | item | text | runtime | dateline
-------------------------------------
now say i create this query:
$stats = mysql_query("
SELECT COUNT(*) as total, AVG(runtime) as avgtime
FROM table WHERE dateline > ".strtotime('6 hours ago')."
");
should dateline be an index?
basically, i would like to know when i should create an index, when an
index is not needed, and what columns should be indexes..
any urls which explains all this would be helpful.
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