postgresql/contrib/rtree_gist
Bruce Momjian 7aac048b59 Attached is a patch to deal with the ones that I missed the first time
around.  I tested this patch under Cygwin and Linux.

Note that I only changed dblink's Makefile in the most minimal way
to fix the link problem under Cygwin (i.e., use the link rule from
Makefile.shlib instead).  dblink's Makefile should probably be further
patched to be consistent with the other PostgreSQL Makefiles.

Jason Tishler
2001-06-20 00:04:44 +00:00
..
bench Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
data Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
expected Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
sql Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
Makefile Attached is a patch to deal with the ones that I missed the first time 2001-06-20 00:04:44 +00:00
README.rtree_gist Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
rtree_gist.c Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00
rtree_gist.sql.in Support for emulating RTREE indexing in GiST. Contributed by 2001-05-31 18:27:18 +00:00

This is R-Tree implementation using GiST.
Code (for PG95) are taken from http://s2k-ftp.cs.berkeley.edu:8000/gist/pggist/
and changed according to new version of GiST (7.1 and above)

All work was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
(oleg@sai.msu.su). See http://www.sai.msu.su/~megera/postgres/gist
for additional information.

CHANGES:
     Tue May 29 17:04:16 MSD 2001
     
     1. Small fixes in polygon code
        Thanks to Dave Blasby <dblasby@refractions.net>

     Mon May 28 19:42:14 MSD 2001

     1. Full implementation of R-tree using GiST - gist_box_ops,gist_poly_ops
     2. gist_poly_ops is lossy
     3. NULLs support
     4. works with multi-key GiST
     
NOTICE:
     This version will works only with postgresql version 7.1 and above
     because of changes in interface of function calling.

INSTALLATION:

  gmake
  gmake install
  -- load functions
  psql <database> < rtree_gist.sql

REGRESSION TEST:

   gmake installcheck

EXAMPLE USAGE:

   create table boxtmp (b box);
   -- create index
   create index bix on boxtmp using gist (b gist_box_ops);
   -- query
   select * from boxtmp where b && '(1000,1000,0,0)'::box;


BENCHMARKS:

 subdirectory bench contains benchmark suite.
 Prerequisities: perl, DBI, DBD:Pg, Time::HiRes

  cd ./bench
  1. createdb TEST
  2. psql TEST < ../box.sql
  3. ./create_test.pl | psql TEST 
     -- change $NUM - number of rows in test dataset
  4. ./bench.pl - perl script to benchmark queries. 
                  Run script without arguments to see available options.

     a)test without GiST index, using built-in R-Tree
       ./bench.pl -d TEST 
     b)test R-Tree using GiST index
       ./bench.pl -d TEST -g 


RESULTS:

1. One interesting thing is that insertion time for built-in R-Tree is 
   about 8 times more than ones for GiST implementation of R-Tree !!!
2. Postmaster requires much more memory for built-in R-Tree
3. Search time depends on dataset. In our case we got:
        +------------+-----------+--------------+
        |Number boxes|R-tree, sec|R-tree using  |
        |            |           |   GiST, sec  |
        +------------+-----------+--------------+
        |          10|      0.002|         0.002|
        +------------+-----------+--------------+
        |         100|      0.002|         0.002|
        +------------+-----------+--------------+
        |        1000|      0.002|         0.002|
        +------------+-----------+--------------+
        |       10000|      0.015|         0.025|
        +------------+-----------+--------------+
        |       20000|      0.029|         0.048|
        +------------+-----------+--------------+
        |       40000|      0.055|         0.092|
        +------------+-----------+--------------+
        |       80000|      0.113|         0.178|
        +------------+-----------+--------------+
        |      160000|      0.338|         0.337|
        +------------+-----------+--------------+
        |      320000|      0.674|         0.673|
        +------------+-----------+--------------+