Re: How to determine the Oracle session's constraint state?
From: ddf <oratune_at_msn.com>
Date: Tue, 9 Feb 2010 05:51:25 -0800 (PST)
Message-ID: <cf165c3c-5766-45d0-8b41-d5a9f1cf13ce_at_b7g2000pro.googlegroups.com>
On Feb 8, 1:09 pm, "John Peterson" <j0..._at_comcast.net> wrote:
> "Mark D Powell" <Mark.Powe..._at_hp.com> wrote in messagenews:63f31d18-8229-43b2-9fbb-1c79cb5bdefc_at_l26g2000yqd.googlegroups.com...
>
>
>
>
>
> > On Feb 8, 12:08 pm, "John Peterson" <j0..._at_comcast.net> wrote:
> >> Hello!
>
> >> First time poster in this forum -- please forgive me if this is the wrong
> >> place for my question. I've exhausted a web search on this issue, and
> >> was
> >> hoping that this might be a more targeted approach.
>
> >> I am trying to programmatically determine the current session's
> >> constraint
> >> state (immediate, deferred, or default).
>
> >> I have a procedure that I'd like to implement which would essentially
> >> temporarily set the constraints "deferred" (e.g. SET CONSTRAINTS ALL
> >> DEFERRED), perform some work, and then restore the constraint setting to
> >> the
> >> original state (e.g., immediate). However, I'm having a difficult time
> >> identifying how to determine the current state of the constraints.
>
> >> Any help would be very much appreciated!
>
> >> Kind regards,
>
> >> John Peterson
>
> > See the DEFERRABLE and DEFERRED columns in the ALL_, USER_, or
> > DBA_CONSTRAINTS views (documented in the Oracle version# Reference
> > manual).
>
> > By the way making a PK or UK deferrable would require use of a non-
> > unique index to support the constraint instead of the standard unique
> > index.
>
> > HTH -- Mark D Powell --
>
> Thanks, Mark!
>
> Unfortunately, those metadata views don't seem to reflect the current
> session state.
>
> That is, if I have some FKs that are deferrable (but initially immediate)
> (e.g., CONSTRAINT_TYPE = 'R'), it will show DEFERRABLE/IMMEDIATE in the
> DEFERRABLE/DEFERRED columns.
>
> But, after I run:
>
> SET CONSTRAINTS ALL DEFERRED
>
> Those columns are still DEFERRABLE/IMMEDIATE in the metadata views.
>
> I had thought maybe I could obtain this information from the SYS_CONTEXT
> function to get the current session state information, but none of the
> options seem applicable.
>
> Any other ideas?- Hide quoted text -
>
> - Show quoted text -
Date: Tue, 9 Feb 2010 05:51:25 -0800 (PST)
Message-ID: <cf165c3c-5766-45d0-8b41-d5a9f1cf13ce_at_b7g2000pro.googlegroups.com>
On Feb 8, 1:09 pm, "John Peterson" <j0..._at_comcast.net> wrote:
> "Mark D Powell" <Mark.Powe..._at_hp.com> wrote in messagenews:63f31d18-8229-43b2-9fbb-1c79cb5bdefc_at_l26g2000yqd.googlegroups.com...
>
>
>
>
>
> > On Feb 8, 12:08 pm, "John Peterson" <j0..._at_comcast.net> wrote:
> >> Hello!
>
> >> First time poster in this forum -- please forgive me if this is the wrong
> >> place for my question. I've exhausted a web search on this issue, and
> >> was
> >> hoping that this might be a more targeted approach.
>
> >> I am trying to programmatically determine the current session's
> >> constraint
> >> state (immediate, deferred, or default).
>
> >> I have a procedure that I'd like to implement which would essentially
> >> temporarily set the constraints "deferred" (e.g. SET CONSTRAINTS ALL
> >> DEFERRED), perform some work, and then restore the constraint setting to
> >> the
> >> original state (e.g., immediate). However, I'm having a difficult time
> >> identifying how to determine the current state of the constraints.
>
> >> Any help would be very much appreciated!
>
> >> Kind regards,
>
> >> John Peterson
>
> > See the DEFERRABLE and DEFERRED columns in the ALL_, USER_, or
> > DBA_CONSTRAINTS views (documented in the Oracle version# Reference
> > manual).
>
> > By the way making a PK or UK deferrable would require use of a non-
> > unique index to support the constraint instead of the standard unique
> > index.
>
> > HTH -- Mark D Powell --
>
> Thanks, Mark!
>
> Unfortunately, those metadata views don't seem to reflect the current
> session state.
>
> That is, if I have some FKs that are deferrable (but initially immediate)
> (e.g., CONSTRAINT_TYPE = 'R'), it will show DEFERRABLE/IMMEDIATE in the
> DEFERRABLE/DEFERRED columns.
>
> But, after I run:
>
> SET CONSTRAINTS ALL DEFERRED
>
> Those columns are still DEFERRABLE/IMMEDIATE in the metadata views.
>
> I had thought maybe I could obtain this information from the SYS_CONTEXT
> function to get the current session state information, but none of the
> options seem applicable.
>
> Any other ideas?- Hide quoted text -
>
> - Show quoted text -
Deferrable constraints are either deferred or immediate and that is set at the constraint level, which is independent of the session. One does not execute
alter session set constraint ...
one submits
alter constraint ...
Why would you think such changes would be at the session level? The constraint is already listed as DEFERRABLE/IMMEDIATE; setting it to DEFERRED would not change that.
David Fitzjarrell. Received on Tue Feb 09 2010 - 07:51:25 CST