Обсуждение: What type of index should I use?
I have a varying(200) text column that I need to be able to do lookups on very fast (WHERE col = 'foo') - The data in this table will pretty much never change (when it does I have to restart the entire server, so updates of any sort are extremely rare). I estimate the table will hold around 5,000 rows, never any more. Am I better off using a btree index or should I use GiN? From what I've read, GiN is extremely fast, but very slow for updates. However, it was unclear to me if they're only fast when doing fulltext searches, or if they're just fast period. Thanks! Mike
Mike Christensen <mike@kitchenpc.com> writes: > I have a varying(200) text column that I need to be able to do lookups > on very fast (WHERE col = 'foo') Btree is what to use here. GIN covers cases where you index arrays. > I estimate the table will hold around 5,000 rows, never any more. It could be that you're better off without any index, depending on the size of rows you put in there, and the overall memory usage patterns you have. Regards, -- dim
On Tuesday 22 June 2010 10.49:00 Dimitri Fontaine wrote: > > I estimate the table will hold around 5,000 rows, never any more. > > It could be that you're better off without any index, depending on the > size of rows you put in there, and the overall memory usage patterns you > have. I agree: don't overstimate the effect an index can have and don't underestimate the cost of index updates. Have you tested performance as it is? Spending time to tune that doesn't need tuning is an interesting hobby, but probably nothing more :-) cheers -- vbi -- Today is Pungenday, the 27th day of Confusion in the YOLD 3176