Re: foreign key on delete cascade order?
| От | George Woodring |
|---|---|
| Тема | Re: foreign key on delete cascade order? |
| Дата | |
| Msg-id | CACi+J=R1DLsGUgc9dnKwdLbwUUCAftbxa_Z4ZUeVDJ+hU=5bxA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: foreign key on delete cascade order? (Tom Lane <tgl@sss.pgh.pa.us>) |
| Ответы |
Re: foreign key on delete cascade order?
(Michael Lewis <mlewis@entrata.com>)
|
| Список | pgsql-general |
On Thu, Mar 10, 2022 at 12:38 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
With the amount of detail you've provided (viz: none)
This is an example of the error we are seeing from our application. Sorry, I cannot find the postgresql log entry for this one.
Detail: Process 27442 waits for ShareLock on transaction 1895244982; blocked by process 21064.
Process 21064 waits for ShareLock on transaction 1895245026; blocked by process 27442.
Hint: See server log for query details.
Where: while deleting tuple (5,18) in relation "status"
SQL statement "DELETE FROM ONLY "public"."status" WHERE $1 OPERATOR(pg_catalog.=) "pollid""; nested exception is org.postgresql.util.PSQLException: ERROR: deadlock detected
Detail: Process 27442 waits for ShareLock on transaction 1895244982; blocked by process 21064.
Process 21064 waits for ShareLock on transaction 1895245026; blocked by process 27442.
Hint: See server log for query details.
Where: while deleting tuple (5,18) in relation "status"
SQL statement "DELETE FROM ONLY "public"."status" WHERE $1 OPERATOR(pg_catalog.=) "pollid""
org.springframework.dao.DeadlockLoserDataAccessException: PreparedStatementCallback; SQL [DELETE FROM mach WHERE (machid=?)]; ERROR: deadlock detected
Detail: Process 27442 waits for ShareLock on transaction 1895244982; blocked by process 21064.
Process 21064 waits for ShareLock on transaction 1895245026; blocked by process 27442.
Hint: See server log for query details.
Where: while deleting tuple (5,18) in relation "status"
SQL statement "DELETE FROM ONLY "public"."status" WHERE $1 OPERATOR(pg_catalog.=) "pollid""; nested exception is org.postgresql.util.PSQLException: ERROR: deadlock detected
Detail: Process 27442 waits for ShareLock on transaction 1895244982; blocked by process 21064.
Process 21064 waits for ShareLock on transaction 1895245026; blocked by process 27442.
Hint: See server log for query details.
Where: while deleting tuple (5,18) in relation "status"
SQL statement "DELETE FROM ONLY "public"."status" WHERE $1 OPERATOR(pg_catalog.=) "pollid""
The tables are involved are
CREATE TABLE mach ( machid serial, constraint mach_pkey primary key (machid) ... );
CREATE TABLE mach ( machid serial, constraint mach_pkey primary key (machid) ... );
CREATE TABLE pollgrpinfo ( pollgrpid serial, constraint pollgrpinfo_pkey primary key (pollgrpid),
machid int4 NOT NULL, constraint mach_exists FOREIGN KEY(machid) REFERENCES mach ON DELETE CASCADE, ... );
machid int4 NOT NULL, constraint mach_exists FOREIGN KEY(machid) REFERENCES mach ON DELETE CASCADE, ... );
CREATE TABLE poll ( pollid serial, constraint poll_pkey primary key (pollid),
pollgrpid int4 not null, constraint pollgrp_exists FOREIGN KEY(pollgrpid) REFERENCES pollgrpinfo (pollgrpid) ON DELETE CASCADE, ...);
pollgrpid int4 not null, constraint pollgrp_exists FOREIGN KEY(pollgrpid) REFERENCES pollgrpinfo (pollgrpid) ON DELETE CASCADE, ...);
CREATE TABLE status ( statusid serial, constraint status_pkey primary key (statusid),
pollid int4 not null, constraint poll_exists FOREIGN KEY(pollid) REFERENCES poll ON DELETE CASCADE, ...);
pollid int4 not null, constraint poll_exists FOREIGN KEY(pollid) REFERENCES poll ON DELETE CASCADE, ...);
We are updating the entire status table every 5 minutes with
BEGIN;
UPDATE status SET () WHERE pollid = $1;
COMMIT;
The issue is arriving when some does a DELETE during the UPDATE of status
DELETE FROM mach WHERE machid=$1;
I don't know if this sheds any more light on it.
George
iGLASS Networks
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