On Wed, Aug 29, 2012 at 2:17 PM, Bruce Momjian <br...@momjian.us> wrote: > On Wed, Aug 29, 2012 at 12:52:50PM -0600, Scott Marlowe wrote: >> On Wed, Aug 29, 2012 at 11:43 AM, Bruce Momjian <br...@momjian.us> wrote: >> > On Wed, Aug 29, 2012 at 10:31:21AM -0700, Aleksey Tsalolikhin wrote: >> >> On Wed, Aug 29, 2012 at 9:45 AM, Merlin Moncure <mmonc...@gmail.com> >> >> wrote: >> >> > citext unfortunately doesn't allow for index optimization of LIKE >> >> > queries, which IMNSHO defeats the whole purpose. to the best way >> >> > remains to use lower() ... >> >> > this will be index optimized and fast as long as you specified C >> >> > locale for your database. >> >> >> >> What is the difference between C and en_US.UTF8, please? We see that >> >> the same query (that invokes a sort) runs 15% faster under the C >> >> locale. The output between C and en_US.UTF8 is identical. We're >> >> considering moving our database from en_US.UTF8 to C, but we do deal >> >> with internationalized text. >> > >> > Well, C has reduced overhead for string comparisons, but obviously >> > doesn't work well for international characters. The single-byte >> > encodings have somewhat less overhead than UTF8. You can try using C >> > locales for databases that don't require non-ASCII characters. >> >> I think you're confusing encodings with locales. C is a locale. You > > I think technically C is a non-locale.
True. But it's NOT an encoding. >> can have a database with a locale of C and UTF-8 encoding. >> >> create database clocale_utf8 encoding='UTF8' LC_COLLATE= 'C' >> template=template0; >> >> \l >> Name | Owner | Encoding | Collate | Ctype | >> Access privileges >> --------------+----------+-----------+-------------+-------------+----------------------- >> clocale_utf8 | smarlowe | UTF8 | C | en_US.UTF-8 | >> >> >> SQL_ASCII is the encoding equivalent of C locale, but it also allows >> multi-byte characters. > > Yes, but what sort ordering do you get in that case? Byte ordering. -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
