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1db943b3ca
regression tests for the GiST changes ... this should be integrated into the regular regression tests similar to Vadim's SPI contrib stuff ...
82 lines
2.6 KiB
Plaintext
82 lines
2.6 KiB
Plaintext
This is an implementation of RD-tree data structure using GiST interface
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of PostgreSQL. It has built-in lossy compression - must be declared
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in index creation - with (islossy). Current implementation has index support
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for one-dimensional array of int4's.
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All work was done by Teodor Sigaev (teodor@stack.net) and Oleg Bartunov
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(oleg@sai.msu.su). See http://www.sai.msu.su/~megera/postgres/gist
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for additional information.
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INSTALLATION:
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gmake
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gmake install
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-- load functions
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psql <database> < _int.sql
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REGRESSION TEST:
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gmake installcheck
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EXAMPLE USAGE:
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create table message (mid int not null,sections int[]);
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create table message_section_map (mid int not null,sid int not null);
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-- create indices
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CREATE unique index message_key on message ( mid );
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CREATE unique index message_section_map_key2 on message_section_map (sid, mid );
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CREATE INDEX message_rdtree_idx on message using gist ( sections ) with ( islossy );
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-- select some messages with section in 1 OR 2 - OVERLAP operator
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select message.mid from message where message.sections && '{1,2}';
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-- select messages contains in sections 1 AND 2 - CONTAINS operator
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select message.mid from message where message.sections @ '{1,2}';
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-- the same, CONTAINED operator
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select message.mid from message where '{1,2}' ~ message.sections;
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BENCHMARK:
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subdirectory bench contains benchmark suite.
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cd ./bench
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1. createdb TEST
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2. psql TEST < ../_int.sql
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3. ./create_test.pl | psql TEST
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4. ./bench.pl - perl script to benchmark queries, supports OR, AND queries
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with/without RD-Tree. Run script without arguments to
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see availbale options.
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a)test without RD-Tree (OR)
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./bench.pl -d TEST -s 1,2 -v
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b)test with RD-Tree
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./bench.pl -d TEST -s 1,2 -v -r
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BENCHMARKS:
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Size of table <message>: 200000
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Size of table <message_section_map>: 268538
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Distribution of messages by sections:
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section 0: 73899 messages
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section 1: 16298 messages
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section 50: 1241 messages
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section 99: 705 messages
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old - without RD-Tree support,
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new - with RD-Tree
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+----------+---------------+----------------+
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|Search set|OR, time in sec|AND, time in sec|
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| +-------+-------+--------+-------+
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| | old | new | old | new |
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+----------+-------+-------+--------+-------+
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| 1| 1.427| 0.215| -| -|
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+----------+-------+-------+--------+-------+
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| 99| 1.029| 0.018| -| -|
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+----------+-------+-------+--------+-------+
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| 1,2| 1.829| 0.334| 5.654| 0.042|
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+----------+-------+-------+--------+-------+
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| 1,2,50,60| 2.057| 0.359| 5.044| 0.007|
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+----------+-------+-------+--------+-------+
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