Re: Hash index use presently(?) discouraged since 2005: revive or bury it?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, Sep 15, 2011 at 5:00 PM, Merlin Moncure <mmoncure@xxxxxxxxx> wrote:
>
> HM, what if you junked the current hash indexam, and just implemented
> a wrapper over btree so that the 'hash index' was just short hand for
> hashing the value into a standard index?

I'm doing this (only by hand, indexing on hash(blah)) on an
application, and it works wonders.
But... it's kinda not a hash table. It's still O(log N).

However, it would be a *very* useful feature if it can be made
transparent for applications.
And I would prefer it over a true hashtable, in the end. Hashes are,
in fact, O(N) worst case.

-- 
Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance


[Postgresql General]     [Postgresql PHP]     [PHP Users]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Yosemite]

  Powered by Linux