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Parsed test spec with 3 sessions
starting permutation: chkiso prepi preps begin disableseq explaini enableseq explains select2 drop insert2 end2 selecti selects end
step chkiso: SELECT (setting in ('read committed','read uncommitted')) AS is_read_committed FROM pg_settings WHERE name = 'default_transaction_isolation';
is_read_committed
-----------------
f
(1 row)
step prepi: PREPARE getrow_idxscan AS SELECT * FROM test_dc WHERE data = 34 ORDER BY id,data;
step preps: PREPARE getrow_seqscan AS SELECT * FROM test_dc WHERE data = 34 ORDER BY id,data;
step begin: BEGIN;
step disableseq: SET enable_seqscan = false;
step explaini: EXPLAIN (COSTS OFF) EXECUTE getrow_idxscan;
QUERY PLAN
----------------------------------------------
Sort
Sort Key: id
-> Index Scan using test_dc_data on test_dc
Index Cond: (data = 34)
(4 rows)
step enableseq: SET enable_seqscan = true;
step explains: EXPLAIN (COSTS OFF) EXECUTE getrow_seqscan;
QUERY PLAN
---------------------------
Sort
Sort Key: id
-> Seq Scan on test_dc
Filter: (data = 34)
(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_idxscan;
id|data
--+----
34| 34
(1 row)
step selects: EXECUTE getrow_seqscan;
id|data
--+----
34| 34
(1 row)
step end: COMMIT;
step drop: <... completed>
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