mirror of https://github.com/postgres/postgres
5d9f146c64
Patches from: aoki@CS.Berkeley.EDU (Paul M. Aoki) i gave jolly my btree bulkload code a long, long time ago but never gave him a bunch of my bugfixes. here's a diff against the 6.0 baseline. for some reason, this code has slowed down somewhat relative to the insertion-build code on very small tables. don't know why -- it used to be within about 10%. anyway, here are some (highly unscientific!) timings on a dec 3000/300 for synthetic tables with 10k, 100k and 1000k tuples (basically, 1mb, 10mb and 100mb heaps). 'c' means clustered (pre-sorted) inputs and 'u' means unclustered (randomly ordered) inputs. the 10k table basically fits in the buffer pool, but the 100k and 1000k tables don't. as you can see, insertion build is fine if you've sorted your heaps on your index key or if your heap fits in core, but is absolutely horrible on unordered data (yes, that's 7.5 hours to index 100mb of data...) because of the zillions of random i/os. if it doesn't work for you for whatever reason, you can always turn it back off by flipping the FastBuild flag in nbtree.c. i don't have time to maintain it. good luck! baseline code: time psql -c 'create index c10 on k10 using btree (c int4_ops)' bttest real 8.6 time psql -c 'create index u10 on k10 using btree (b int4_ops)' bttest real 9.1 time psql -c 'create index c100 on k100 using btree (c int4_ops)' bttest real 59.2 time psql -c 'create index u100 on k100 using btree (b int4_ops)' bttest real 652.4 time psql -c 'create index c1000 on k1000 using btree (c int4_ops)' bttest real 636.1 time psql -c 'create index u1000 on k1000 using btree (b int4_ops)' bttest real 26772.9 bulkloading code: time psql -c 'create index c10 on k10 using btree (c int4_ops)' bttest real 11.3 time psql -c 'create index u10 on k10 using btree (b int4_ops)' bttest real 10.4 time psql -c 'create index c100 on k100 using btree (c int4_ops)' bttest real 59.5 time psql -c 'create index u100 on k100 using btree (b int4_ops)' bttest real 63.5 time psql -c 'create index c1000 on k1000 using btree (c int4_ops)' bttest real 636.9 time psql -c 'create index u1000 on k1000 using btree (b int4_ops)' bttest real 701.0 |
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README
PostgreSQL Data Base Management System (formally known as Postgres95) This directory contains the 6.0 release of PostgreSQL. See INSTALL for the installation notes and HISTORY for the changes. We also have a WWW home page located at: http://www.postgreSQL.org PostgreSQL is not public domain software. It is copyrighted by the University of California but may be used according to the licensing terms of the the copyright below: ------------------------------------------------------------------------ POSTGRES95 Data Base Management System Copyright (c) 1994-6 Regents of the University of California Permission to use, copy, modify, and distribute this software and its documentation for any purpose, without fee, and without a written agreement is hereby granted, provided that the above copyright notice and this paragraph and the following two paragraphs appear in all copies. IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.