| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | Mike Toews <mwtoews(at)gmail(dot)com> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Deferrable constraint checking with SAVEPOINT? |
| Date: | 2010-06-08 08:04:35 |
| Message-ID: | AANLkTim1DABePGnpfPrSeDOlF9afwSaC9KxZxsfNzm-d@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On 8 June 2010 03:02, Mike Toews <mwtoews(at)gmail(dot)com> wrote:
> Hi,
>
> I have a question that is not specified in the docs[1]. I am using
> deferrable constraints in a transaction with SET CONSTRAINTS ALL
> DEFERRED. Now I know that DEFERRED constraints are not checked until
> transaction COMMIT (i.e., the end), however are they checked with
> SAVEPOINT (i.e., part-way in)?
>
No, SAVEPOINTs will not force a check. A SAVEPOINT is nothing like a
COMMIT (it's more like a nested BEGIN). The only things that will
cause deferred constraints to be checked are a COMMIT or a SET
CONSTRAINTS .. IMMEDIATE.
Regards,
Dean
| From | Date | Subject | |
|---|---|---|---|
| Next Message | John Gage | 2010-06-08 09:04:07 | Cognitive dissonance |
| Previous Message | Tom Lane | 2010-06-08 03:54:09 | Re: What's the best type of index for an ENUM column? |