Dhanaraj M wrote:
> I have the following doubts.
>
> 1. Does postgres create an index on every primary key? Usually, queries
> are performed against a table on the primary key, so, an index on it
> will be very useful.
Yes, a unique index is used to enforce the primary-key.
> 2. If 'm executing a complex query and it takes 10 seconds to return the
> results -- it takes 10 seconds to execute the next time also. I'm
> wondering if there's any kind of caching that can be enabled -- so, the
> next time it takes <10 seconds to return the results.
Not of query results. Obviously data itself might be cached. You might
want to look at memcached for this sort of thing.
-- Richard Huxton Archonet Ltd