> 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.
Well, here is an interesting question that I have suddenly become very curious of, if you have a primary key, obviously a unique index, is it, in fact, use this index regardless of analyzing the table? > >> 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. I am looking at this string of posts and it occurs to me that he should run analyze. Maybe I'm jumping at the wrong point. ---------------------------(end of broadcast)--------------------------- TIP 2: Don't 'kill -9' the postmaster
