| From: | Euler Taveira <euler(at)timbira(dot)com(dot)br> |
|---|---|
| To: | diemersebastien(at)yahoo(dot)fr |
| Cc: | pgsql-docs(at)postgresql(dot)org |
| Subject: | Re: Correction in SHARE ROW EXCLUSIVE lock description |
| Date: | 2017-10-10 15:55:37 |
| Message-ID: | CAHE3wgiPZv5pto9cFwaHUS2XJdRCX17RNuGNZDu064JrUKD6PQ@mail.gmail.com |
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| Lists: | pgsql-docs |
2017-10-09 6:07 GMT-03:00 <diemersebastien(at)yahoo(dot)fr>:
> The following documentation comment has been logged on the website:
>
> Page: https://www.postgresql.org/docs/9.4/static/explicit-locking.html
> Description:
>
> The documentation says :
>
> "This lock mode is not automatically acquired by any PostgreSQL command."
>
You are reading 9.4 documentation but...
> I am wrong if I say that a "ADD CONSTRAINT toto FOREIGN KEY" command will
> take a SHARE ROW EXCLUSIVE lock on both tables concerned by the foreign key
> ?
>
... you are testing with >= 9.5. Indeed, SREL replaced AEL in this
ALTER TABLE case [1].
[1] https://www.postgresql.org/docs/9.5/static/explicit-locking.html
--
Euler Taveira Timbira -
http://www.timbira.com.br/
PostgreSQL: Consultoria, Desenvolvimento, Suporte 24x7 e Treinamento
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