auto_explain_output.log

2019-12-29 21:13:35 GMT [42602]: LOG:  duration: 2.476 ms  plan:
	Query Text: INSERT INTO users (email, password, name) VALUES ('example@example1.com', 'password', 'name1') RETURNING id
	Insert on public.users  (cost=0.00..0.02 rows=1 width=382) (actual time=2.471..2.472 rows=1 loops=1)
	  Output: id
	  Buffers: shared hit=9 read=11 dirtied=9
	  I/O Timings: read=1.879
	  ->  Result  (cost=0.00..0.02 rows=1 width=382) (actual time=1.100..1.100 rows=1 loops=1)
	        Output: nextval('users_id_seq'::regclass), clock_timestamp(), clock_timestamp(), 'example@example1.com'::character varying(140), '\x70617373776f7264'::bytea, 'name1'::text
	        Buffers: shared hit=9 read=4 dirtied=2
	        I/O Timings: read=1.028
2019-12-29 21:13:35 GMT [42602]: LOG:  duration: 17.477 ms  statement: INSERT INTO users (email, password, name) VALUES ('example@example1.com', 'password', 'name1') RETURNING id

pg_prewarm.log

2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 1.995 ms  plan:
	Query Text: SELECT * FROM pg_prewarm('public.users'); SELECT * FROM pg_prewarm('public.users_id_seq');
	Function Scan on public.pg_prewarm  (cost=0.00..0.01 rows=1 width=8) (actual time=1.984..1.985 rows=1 loops=1)
	  Output: pg_prewarm
	  Function Call: pg_prewarm('users'::regclass, 'buffer'::text, 'main'::text, NULL::bigint, NULL::bigint)
	  Buffers: shared hit=33 read=10 dirtied=5
	  I/O Timings: read=1.819
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 0.334 ms  plan:
	Query Text: SELECT * FROM pg_prewarm('public.users'); SELECT * FROM pg_prewarm('public.users_id_seq');
	Function Scan on public.pg_prewarm  (cost=0.00..0.01 rows=1 width=8) (actual time=0.331..0.331 rows=1 loops=1)
	  Output: pg_prewarm
	  Function Call: pg_prewarm('users_id_seq'::regclass, 'buffer'::text, 'main'::text, NULL::bigint, NULL::bigint)
	  Buffers: shared hit=9 read=1
	  I/O Timings: read=0.268
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 8.410 ms  statement: SELECT * FROM pg_prewarm('public.users'); SELECT * FROM pg_prewarm('public.users_id_seq');
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 0.045 ms  statement: BEGIN ISOLATION LEVEL SERIALIZABLE READ WRITE
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 0.012 ms  statement: SAVEPOINT temp1
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 0.007 ms  statement: SAVEPOINT temp2
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 1.889 ms  plan:
	Query Text: INSERT INTO users (email, password, name) VALUES ('example@example1.com', 'password', 'name1') RETURNING id
	Insert on public.users  (cost=0.00..0.02 rows=1 width=116) (actual time=1.887..1.887 rows=1 loops=1)
	  Output: id
	  Buffers: shared hit=1 read=10 dirtied=9
	  I/O Timings: read=1.397
	  ->  Result  (cost=0.00..0.02 rows=1 width=116) (actual time=0.639..0.639 rows=1 loops=1)
	        Output: nextval('users_id_seq'::regclass), clock_timestamp(), clock_timestamp(), 'example@example1.com'::text, '\x70617373776f7264'::bytea, 'name1'::text
	        Buffers: shared hit=1 read=3 dirtied=2
	        I/O Timings: read=0.596
2019-12-29 22:34:16 GMT [45399]: LOG:  duration: 4.056 ms  statement: INSERT INTO users (email, password, name) VALUES ('example@example1.com', 'password', 'name1') RETURNING id

second_insert.log

2019-12-29 21:13:35 GMT [42602]: LOG:  duration: 0.036 ms  plan:
	Query Text: INSERT INTO users (email, password, name) VALUES ('example@example2.com', 'password', 'name2') RETURNING id
	Insert on public.users  (cost=0.00..0.02 rows=1 width=382) (actual time=0.034..0.035 rows=1 loops=1)
	  Output: id
	  Buffers: shared hit=8
	  ->  Result  (cost=0.00..0.02 rows=1 width=382) (actual time=0.003..0.003 rows=1 loops=1)
	        Output: nextval('users_id_seq'::regclass), clock_timestamp(), clock_timestamp(), 'example@example2.com'::character varying(140), '\x70617373776f7264'::bytea, 'name2'::text
	        Buffers: shared hit=1
2019-12-29 21:13:35 GMT [42602]: LOG:  duration: 0.176 ms  statement: INSERT INTO users (email, password, name) VALUES ('example@example2.com', 'password', 'name2') RETURNING id

users.sql

CREATE TABLE users
( id           SERIAL PRIMARY KEY
, created_at   TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT clock_timestamp()
, modified_at  TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT clock_timestamp()
, email        text NOT NULL
, password     bytea        NOT NULL
, name         text         NOT NULL
, UNIQUE (email)
);