Re: dropping constraints

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Re: dropping constraints

От:
Tom Lane <tgl@sss.pgh.pa.us>
Дата:
Kevin Kempter  writes:
> we have a few not null constraints we want to drop on very large tables. 
> Unfortunately the drop's are taking hours. Is there a way to drop a not null 
> constraint via the system catalogs?

Dropping a NOT NULL constraint is a trivial operation.  The problem is
probably that you are blocked waiting to get a lock on the table.
Look for idle-in-transaction sessions that are holding locks on the
target table.

			regards, tom lane

dropping constraints

От:
Kevin Kempter <cs_dba@consistentstate.com>
Дата:
Hi All;

we have a few not null constraints we want to drop on very large tables. 
Unfortunately the drop's are taking hours. Is there a way to drop a not null 
constraint via the system catalogs?

Thanks in advance

Re: dropping constraints

От:
Kevin Kempter <cs_dba@consistentstate.com>
Дата:
]
> Kevin Kempter  writes:
> > we have a few not null constraints we want to drop on very large tables.
> > Unfortunately the drop's are taking hours. Is there a way to drop a not
> > null constraint via the system catalogs?
>
> Dropping a NOT NULL constraint is a trivial operation.  The problem is
> probably that you are blocked waiting to get a lock on the table.
> Look for idle-in-transaction sessions that are holding locks on the
> target table.
>
> 			regards, tom lane

thanks
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