123 lines
4.0 KiB
Python
123 lines
4.0 KiB
Python
# Test for page level predicate locking in hash index
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#
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# Test to verify serialization failures and to check reduced false positives
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#
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# To verify serialization failures, queries and permutations are written in such
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# a way that an index scan (from one transaction) and an index insert (from
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# another transaction) will try to access the same bucket of the index
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# whereas to check reduced false positives, they will try to access different
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# buckets of the index.
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setup
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{
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create table hash_tbl(id int4, p integer);
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create index hash_idx on hash_tbl using hash(p);
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insert into hash_tbl (id, p)
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select g, 10 from generate_series(1, 10) g;
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insert into hash_tbl (id, p)
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select g, 20 from generate_series(11, 20) g;
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insert into hash_tbl (id, p)
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select g, 30 from generate_series(21, 30) g;
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insert into hash_tbl (id, p)
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select g, 40 from generate_series(31, 40) g;
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}
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teardown
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{
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drop table hash_tbl;
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}
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session s1
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setup
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{
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begin isolation level serializable;
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set enable_seqscan=off;
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set enable_bitmapscan=off;
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set enable_indexonlyscan=on;
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}
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step rxy1 { select sum(p) from hash_tbl where p=20; }
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step wx1 { insert into hash_tbl (id, p)
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select g, 30 from generate_series(41, 50) g; }
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step rxy3 { select sum(p) from hash_tbl where p=20; }
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step wx3 { insert into hash_tbl (id, p)
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select g, 50 from generate_series(41, 50) g; }
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step c1 { commit; }
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session s2
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setup
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{
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begin isolation level serializable;
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set enable_seqscan=off;
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set enable_bitmapscan=off;
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set enable_indexonlyscan=on;
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}
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step rxy2 { select sum(p) from hash_tbl where p=30; }
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step wy2 { insert into hash_tbl (id, p)
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select g, 20 from generate_series(51, 60) g; }
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step rxy4 { select sum(p) from hash_tbl where p=30; }
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step wy4 { insert into hash_tbl (id, p)
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select g, 60 from generate_series(51, 60) g; }
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step c2 { commit; }
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# An index scan (from one transaction) and an index insert (from another
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# transaction) try to access the same bucket of the index but one transaction
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# commits before other transaction begins so no r-w conflict.
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permutation rxy1 wx1 c1 rxy2 wy2 c2
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permutation rxy2 wy2 c2 rxy1 wx1 c1
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# An index scan (from one transaction) and an index insert (from another
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# transaction) try to access different buckets of the index and also one
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# transaction commits before other transaction begins, so no r-w conflict.
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permutation rxy3 wx3 c1 rxy4 wy4 c2
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permutation rxy4 wy4 c2 rxy3 wx3 c1
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# An index scan (from one transaction) and an index insert (from another
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# transaction) try to access the same bucket of the index and one transaction
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# begins before other transaction commits so there is a r-w conflict.
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permutation rxy1 wx1 rxy2 c1 wy2 c2
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permutation rxy1 wx1 rxy2 wy2 c1 c2
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permutation rxy1 wx1 rxy2 wy2 c2 c1
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permutation rxy1 rxy2 wx1 c1 wy2 c2
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permutation rxy1 rxy2 wx1 wy2 c1 c2
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permutation rxy1 rxy2 wx1 wy2 c2 c1
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permutation rxy1 rxy2 wy2 wx1 c1 c2
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permutation rxy1 rxy2 wy2 wx1 c2 c1
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permutation rxy1 rxy2 wy2 c2 wx1 c1
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permutation rxy2 rxy1 wx1 c1 wy2 c2
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permutation rxy2 rxy1 wx1 wy2 c1 c2
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permutation rxy2 rxy1 wx1 wy2 c2 c1
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permutation rxy2 rxy1 wy2 wx1 c1 c2
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permutation rxy2 rxy1 wy2 wx1 c2 c1
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permutation rxy2 rxy1 wy2 c2 wx1 c1
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permutation rxy2 wy2 rxy1 wx1 c1 c2
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permutation rxy2 wy2 rxy1 wx1 c2 c1
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permutation rxy2 wy2 rxy1 c2 wx1 c1
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# An index scan (from one transaction) and an index insert (from another
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# transaction) try to access different buckets of the index so no r-w conflict.
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permutation rxy3 wx3 rxy4 c1 wy4 c2
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permutation rxy3 wx3 rxy4 wy4 c1 c2
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permutation rxy3 wx3 rxy4 wy4 c2 c1
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permutation rxy3 rxy4 wx3 c1 wy4 c2
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permutation rxy3 rxy4 wx3 wy4 c1 c2
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permutation rxy3 rxy4 wx3 wy4 c2 c1
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permutation rxy3 rxy4 wy4 wx3 c1 c2
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permutation rxy3 rxy4 wy4 wx3 c2 c1
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permutation rxy3 rxy4 wy4 c2 wx3 c1
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permutation rxy4 rxy3 wx3 c1 wy4 c2
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permutation rxy4 rxy3 wx3 wy4 c1 c2
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permutation rxy4 rxy3 wx3 wy4 c2 c1
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permutation rxy4 rxy3 wy4 wx3 c1 c2
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permutation rxy4 rxy3 wy4 wx3 c2 c1
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permutation rxy4 rxy3 wy4 c2 wx3 c1
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permutation rxy4 wy4 rxy3 wx3 c1 c2
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permutation rxy4 wy4 rxy3 wx3 c2 c1
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permutation rxy4 wy4 rxy3 c2 wx3 c1
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