РЕДАКТИРОВАТЬ: Посмотрел предложения в комментариях.
Соответствующая таблица (gas_station_information_history) составляет около 5 ГБ.
Файл журнала запуска сервера, выполняющего рабочий запрос и затем выполняется запрос MAX, MIN:
2020-02-03 12:39:54.931 CET [18022] LOG: database system was shut down at 2020-02-03 12:38:55 CET
2020-02-03 12:39:54.936 CET [18020] LOG: database system is ready to accept connections
2020-02-03 12:40:26.615 CET [18020] LOG: background worker "parallel worker" (PID 18040) was terminated by sig$
2020-02-03 12:40:26.615 CET [18020] DETAIL: Failed process was running: SELECT MAX(date), MIN(date)
FROM gas_station_information_history;
2020-02-03 12:40:26.615 CET [18020] LOG: terminating any other active server processes
2020-02-03 12:40:26.615 CET [18038] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:26.615 CET [18038] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:26.615 CET [18038] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:26.615 CET [18031] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:26.615 CET [18031] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:26.615 CET [18031] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:26.616 CET [18027] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:26.616 CET [18027] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:26.616 CET [18027] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:26.619 CET [18020] LOG: all server processes terminated; reinitializing
2020-02-03 12:40:26.685 CET [18041] LOG: database system was interrupted; last known up at 2020-02-03 12:39:54$
2020-02-03 12:40:26.748 CET [18041] LOG: database system was not properly shut down; automatic recovery in pro$
2020-02-03 12:40:26.751 CET [18041] LOG: redo starts at 3/F92C228
2020-02-03 12:40:26.751 CET [18041] LOG: invalid record length at 3/F92C260: wanted 24, got 0
2020-02-03 12:40:26.751 CET [18041] LOG: redo done at 3/F92C228
2020-02-03 12:40:26.784 CET [18020] LOG: database system is ready to accept connections
2020-02-03 12:40:28.959 CET [18020] LOG: background worker "parallel worker" (PID 18053) was terminated by sig$
2020-02-03 12:40:28.959 CET [18020] DETAIL: Failed process was running: SELECT MAX(date), MIN(date)
FROM gas_station_information_history;
2020-02-03 12:40:28.959 CET [18020] LOG: terminating any other active server processes
2020-02-03 12:40:28.959 CET [18051] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:28.959 CET [18051] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:28.959 CET [18051] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:28.959 CET [18049] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:28.959 CET [18049] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:28.959 CET [18049] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:28.960 CET [18045] WARNING: terminating connection because of crash of another server process
2020-02-03 12:40:28.960 CET [18045] DETAIL: The postmaster has commanded this server process to roll back the $
2020-02-03 12:40:28.960 CET [18045] HINT: In a moment you should be able to reconnect to the database and repe$
2020-02-03 12:40:28.964 CET [18020] LOG: all server processes terminated; reinitializing
2020-02-03 12:40:29.038 CET [18054] LOG: database system was interrupted; last known up at 2020-02-03 12:40:26$
2020-02-03 12:40:29.092 CET [18057] FATAL: the database system is in recovery mode
2020-02-03 12:40:29.114 CET [18058] FATAL: the database system is in recovery mode
2020-02-03 12:40:29.117 CET [18054] LOG: database system was not properly shut down; automatic recovery in pro$
2020-02-03 12:40:29.121 CET [18054] LOG: invalid record length at 3/F92C2D8: wanted 24, got 0
2020-02-03 12:40:29.121 CET [18054] LOG: redo is not required
2020-02-03 12:40:29.154 CET [18020] LOG: database system is ready to accept connections
2020-02-03 12:40:33.868 CET [18020] LOG: received fast shutdown request
2020-02-03 12:40:33.869 CET [18020] LOG: aborting any active transactions
2020-02-03 12:40:33.870 CET [18066] FATAL: terminating connection due to administrator command
2020-02-03 12:40:33.871 CET [18020] LOG: background worker "logical replication launcher" (PID 18064) exited w$
2020-02-03 12:40:33.873 CET [18059] LOG: shutting down
2020-02-03 12:40:33.916 CET [18020] LOG: database system is shut down
Я не могу найти ничего в сети на background worker "parallel worker" was terminated by sig$.
Запуск EXPLAIN по запросу дает:
Finalize Aggregate (cost=1034772.50..1034772.51 rows=1 width=16)
-> Gather (cost=1034772.28..1034772.49 rows=2 width=16)
Workers Planned: 2
-> Partial Aggregate (cost=1033772.28..1033772.29 rows=1 width=16)
-> Parallel Seq Scan on gas_station_information_history (cost=0.00..895677.85 rows=27618885 width=8)
JIT:
Functions: 5
Options: Inlining true, Optimization true, Expressions true, Deforming true
Как я могу получить первую и последнюю записанную метку времени с часовым поясом из таблицы в postgresql? Имя столбца метки времени - «дата».
Я пытался
SELECT MAX(date), MIN(date)
FROM tablename;
, что отсоединяет меня: «Этот сокет был завершен другой стороной». Я также попробовал
SELECT *
FROM table
ORDER BY date
LIMIT 10;
Я посмотрел на ресурсы max, min и timestamp, которые, например, предлагают
SELECT MAX (date) AS "Max Date"
FROM orders;
, что приводит к той же ошибке отключения.
Как мне сделать этот простой запрос? Спасибо!