Robert Haas <[email protected]> writes:
> On Thu, Sep 24, 2009 at 8:25 PM, Josh Berkus <[email protected]> wrote:
>> You can't "turn off" sequential scans. You can only make the planner
>> less likely to choose them. But if there's no way to get the data you
>> need other than a seqscan, it's still going to do one.
> And that's not a bad thing. For a very small table, it's often the
> fastest method.
Probably more to the point: if the query involves fetching the whole
table, it's *always* the fastest method. (Except maybe if you want
the results sorted, and often it's the fastest way even so.) Indexes
are not a panacea.
regards, tom lane
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