blob: 97e1a6e77973e45556d68377da0a90521d01e858 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
Parsed test spec with 3 sessions
starting permutation: noseq chkiso prepi preps begin explaini explains select2 drop insert2 end2 selecti selects end
step noseq: SET enable_seqscan = false;
step chkiso: SELECT (setting in ('read committed','read uncommitted')) AS is_read_committed FROM pg_settings WHERE name = 'default_transaction_isolation';
is_read_committed
-----------------
t
(1 row)
step prepi: PREPARE getrow_idx AS SELECT * FROM test_dc WHERE data=34 ORDER BY id,data;
step preps: PREPARE getrow_seq AS SELECT * FROM test_dc WHERE data::text=34::text ORDER BY id,data;
step begin: BEGIN;
step explaini: EXPLAIN (COSTS OFF) EXECUTE getrow_idx;
QUERY PLAN
----------------------------------------------
Sort
Sort Key: id
-> Index Scan using test_dc_data on test_dc
Index Cond: (data = 34)
(4 rows)
step explains: EXPLAIN (COSTS OFF) EXECUTE getrow_seq;
QUERY PLAN
----------------------------------------------
Sort
Sort Key: id, data
-> Index Scan using test_dc_pkey on test_dc
Filter: ((data)::text = '34'::text)
(4 rows)
step select2: SELECT * FROM test_dc WHERE data=34 ORDER BY id,data;
id|data
--+----
34| 34
(1 row)
step drop: DROP INDEX CONCURRENTLY test_dc_data; <waiting ...>
step insert2: INSERT INTO test_dc(data) SELECT * FROM generate_series(1, 100);
step end2: COMMIT;
step selecti: EXECUTE getrow_idx;
id|data
---+----
34| 34
134| 34
(2 rows)
step selects: EXECUTE getrow_seq;
id|data
---+----
34| 34
134| 34
(2 rows)
step end: COMMIT;
step drop: <... completed>
|
