Hello, Sergey!
09.01.2018, 15:53, "Sergei Kornilov" :
> Hello
>
>> 1. ALTER TABLE clusters ADD COLUMN "is_paid" BOOLEAN DEFAULT FALSE;
>
> this is wrong. To avoid large table lock you need DEFAULT NULL:
> ALTER TABLE clusters ADD COLUMN "is_paid" BOOLEAN DEFAULT NULL;
> Default null changes only
Hello
> 1. ALTER TABLE clusters ADD COLUMN "is_paid" BOOLEAN DEFAULT FALSE;
this is wrong. To avoid large table lock you need DEFAULT NULL:
ALTER TABLE clusters ADD COLUMN "is_paid" BOOLEAN DEFAULT NULL;
Default null changes only system catalog, default with any non-null value will
rewrite all ro
Hello Tomas! Thank you for the useful answer!
23.12.2017, 23:58, "Tomas Vondra" :
> On 12/22/2017 05:46 PM, Timokhin Maxim wrote:
>> Hello! We have a large table 11GB ( about 37 million records ) and we
>> need to alter a table - add a new column with default values is
>> false. Also 'NOT NU
On 12/22/2017 05:46 PM, Timokhin Maxim wrote:
>
> Hello! We have a large table 11GB ( about 37 million records ) and we
> need to alter a table - add a new column with default values is
> false. Also 'NOT NULL' is required.
>
> So, first I've done:
>
> ALTER TABLE clusters ALTER COLUMN "is_paid"
Hello,
Does the tale have foreign keys, if not you could create another table may be
unlogged and then do the changes you want via INSERT ... SELECT; and finally
convert the unlogged table to logged table.
In addition to that there are several ways to increase data writing performance
for exam
