Re: Removing a key from jsonb is sloooow

Hi,

Your current query actually process your 10K rows,
it is a bit of an overkill if only a few row contains the key you want to
delete.
Depending on how big your json data is, this could be problematic.

Have you considered adding a where clause to your query ?

Also, maybe you could create an index on your jsonb column
to improve the identification of rows which
contains the key you want to delete ?

Le mer. 17 juil. 2019 à 16:31, Volkan Unsal <spocksplanet(at)gmail(dot)com> a
écrit :

> I'm trying to remove a key from a jsonb column in a table with 10K rows,
> and the performance is abysmal. When the key is missing, it takes 5
> minutes. When the key is present, it takes even longer.
>
> Test with non-existent key:
>
> >> update projects set misc = misc - 'foo';
> Time: 324711.960 ms (05:24.712)
>
> What can I do to improve this?
>