mirror of
https://github.com/pgvector/pgvector.git
synced 2026-06-06 05:51:21 +08:00
114 lines
2.9 KiB
SQL
114 lines
2.9 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 hnsw (val vector_l2_ops);
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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 hnsw (val vector_ip_ops);
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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 hnsw (val vector_cosine_ops);
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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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-- L1
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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 hnsw (val vector_l1_ops);
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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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-- 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 hnsw (val vector_l2_ops);
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SET hnsw.iterative_scan = strict_order;
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SET hnsw.ef_search = 1;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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SET hnsw.iterative_scan = relaxed_order;
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SELECT * FROM t ORDER BY val <-> '[3,3,3]';
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RESET hnsw.iterative_scan;
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RESET hnsw.ef_search;
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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 hnsw (val vector_l2_ops);
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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 hnsw (val vector_l2_ops) WITH (m = 1);
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CREATE INDEX ON t USING hnsw (val vector_l2_ops) WITH (m = 101);
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CREATE INDEX ON t USING hnsw (val vector_l2_ops) WITH (ef_construction = 3);
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CREATE INDEX ON t USING hnsw (val vector_l2_ops) WITH (ef_construction = 1001);
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CREATE INDEX ON t USING hnsw (val vector_l2_ops) WITH (m = 16, ef_construction = 31);
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SHOW hnsw.ef_search;
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SET hnsw.ef_search = 0;
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SET hnsw.ef_search = 1001;
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SHOW hnsw.iterative_scan;
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SET hnsw.iterative_scan = on;
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SHOW hnsw.max_scan_tuples;
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SET hnsw.max_scan_tuples = 0;
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SHOW hnsw.scan_mem_multiplier;
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SET hnsw.scan_mem_multiplier = 0;
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DROP TABLE t;
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