-
Notifications
You must be signed in to change notification settings - Fork 1
Expand file tree
/
Copy path08_write_skew_spec.log
More file actions
33 lines (33 loc) · 1.81 KB
/
08_write_skew_spec.log
File metadata and controls
33 lines (33 loc) · 1.81 KB
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
[observer] CREATE TABLE events (
[observer] id text NOT NULL,
[observer] available_seats integer NOT NULL CHECK (available_seats >= 0),
[observer] PRIMARY KEY (id)
[observer] ); (2.1ms)
[observer] CREATE TABLE bookings (
[observer] id uuid DEFAULT gen_random_uuid() NOT NULL,
[observer] customer_name text NOT NULL,
[observer] seat_count integer NOT NULL,
[observer] event_id text NOT NULL,
[observer] FOREIGN KEY (event_id) REFERENCES events (id),
[observer] PRIMARY KEY (id)
[observer] ); (2.3ms)
[observer] BEGIN (0.7ms)
[observer] INSERT INTO "events" ("id", "available_seats") VALUES ('event_a', 2) RETURNING "id" (1.9ms)
[observer] COMMIT (0.6ms)
[observer] SELECT "events"."available_seats" FROM "events" WHERE "events"."id" = 'event_a' (0.5ms)
[observer] => 2
[alice] BEGIN ISOLATION LEVEL READ COMMITTED (0.5ms)
[bob] BEGIN ISOLATION LEVEL READ COMMITTED (0.4ms)
[alice] UPDATE events SET available_seats = available_seats - 1 WHERE id = 'event_a' AND available_seats > 1 RETURNING id (5.1ms)
[alice] => [{"id" => "event_a"}]
[alice] INSERT INTO "bookings" ("customer_name", "seat_count", "event_id") VALUES ('Alice', 1, 'event_a') RETURNING "id" (3.2ms)
[alice] COMMIT (4.7ms)
[bob] UPDATE events SET available_seats = available_seats - 1 WHERE id = 'event_a' AND available_seats > 1 RETURNING id (922.5ms)
[bob] => []
[bob] ROLLBACK (3.0ms)
[observer] SELECT "events"."available_seats" FROM "events" WHERE "events"."id" = 'event_a' (2.8ms)
[observer] => 1
[observer] SELECT SUM("bookings"."seat_count") FROM "bookings" (2.9ms)
[observer] => 1
[observer] DROP TABLE IF EXISTS bookings; (7.7ms)
[observer] DROP TABLE IF EXISTS events; (7.0ms)