session_replication_role 'replica' behavior

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От Manos Tsahakis
Тема session_replication_role 'replica' behavior
Дата
Msg-id CABuvXqo+A0Dvn41Qsg3pkq+6-htdRig75X-ui_FiKn1yLofKow@mail.gmail.com
обсуждение исходный текст
Ответы Re: session_replication_role `replica` behavior
Список pgsql-general
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Hello all,

In our application we are enabling session_replication_role TO 'replica' in certain situations so that triggers will not fire in a table during DML operations. However, we observed that when setting session_replication_role TO 'replica' referential integrity constraints will not fire on a table either.

A simple example is given bellow:

dynacom=# create table parent (id serial primary key, name text not null);

dynacom=# create table child (id serial primary key, name text not null,pid int NOT NULL REFERENCES parent(id) ON DELETE CASCADE);

dynacom=# insert into parent (name) values ('test 1');
INSERT 0 1

dynacom=# insert into parent (name) values ('test 2');
INSERT 0 1

dynacom=# insert into child (name,pid) values ('test kid2',2);
INSERT 0 1
dynacom=# begin ;
BEGIN
dynacom=# set session_replication_role TO 'replica';
SET
dynacom=# delete from parent where id=2;
DELETE 1
dynacom=# commit ;
COMMIT

dynacom=# select * from child;
 id |   name    | pid
----+-----------+-----
  2 | test kid2 |   2
(1 row)

dynacom=# select * from parent;
 id | name
----+------
(0 rows)

So we are a left, basically, with an inconsistent database.

1. 9.2 documentation (http://www.postgresql.org/docs/9.2/static/sql-altertable.html) in the "DISABLE/ENABLE [ REPLICA | ALWAYS ] TRIGGER" section, makes a distinction between USER (non system-constraint related) and ALL triggers, but does not state that simply(??) enabled system (non-user) constraint triggers will not fire in case of session_replication_role = replica. Shouldn't non-user triggers *not* be affected by session_replication_role ?

2. Is there any way to just find the name of the FK constraint trigger and convert it to
ENABLE ALWAYS?

For the above test we used postgresql 9.2, currently we are running postgresql 9.0 in production.

Kind Regards,
manos


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