mirror of
https://github.com/pgvector/pgvector.git
synced 2026-06-06 05:51:21 +08:00
97 lines
2.4 KiB
SQL
97 lines
2.4 KiB
SQL
SET enable_seqscan = off;
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-- L2
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CREATE TABLE t (val vector(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <-> (SELECT NULL::vector)) t2;
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SELECT COUNT(*) FROM t;
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TRUNCATE t;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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DROP TABLE t;
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-- inner product
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CREATE TABLE t (val vector(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val vector_ip_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <#> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <#> (SELECT NULL::vector)) t2;
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DROP TABLE t;
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-- cosine
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CREATE TABLE t (val vector(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val vector_cosine_ops) WITH (lists = 1);
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INSERT INTO t (val) VALUES ('[1,2,4]');
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SELECT * FROM t ORDER BY val <=> '[3,3,3]';
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> '[0,0,0]') t2;
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SELECT COUNT(*) FROM (SELECT * FROM t ORDER BY val <=> (SELECT NULL::vector)) t2;
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DROP TABLE t;
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-- iterative
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CREATE TABLE t (val vector(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 3);
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SET ivfflat.iterative_search = relaxed_order;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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SET ivfflat.max_probes = 1;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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SET ivfflat.max_probes = 2;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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RESET ivfflat.iterative_search;
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RESET ivfflat.max_probes;
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DROP TABLE t;
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-- unlogged
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CREATE UNLOGGED TABLE t (val vector(3));
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INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
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CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 1);
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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DROP TABLE t;
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-- options
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CREATE TABLE t (val vector(3));
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CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 0);
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CREATE INDEX ON t USING ivfflat (val vector_l2_ops) WITH (lists = 32769);
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SHOW ivfflat.probes;
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SET ivfflat.probes = 0;
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SET ivfflat.probes = 32769;
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SHOW ivfflat.iterative_search;
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SET ivfflat.iterative_search = on;
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SHOW ivfflat.max_probes;
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SET ivfflat.max_probes = 0;
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SET ivfflat.max_probes = 32769;
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DROP TABLE t;
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