Re: UPDATE many records - Mailing list pgsql-general

From Israel Brewster
Subject Re: UPDATE many records
Date
Msg-id F9677E36-0B9C-4C5C-9251-568F3CEC1827@alaska.edu
Whole thread Raw
In response to Re: UPDATE many records  (Alan Hodgson <ahodgson@lists.simkin.ca>)
Responses Re: UPDATE many records
Re: UPDATE many records
List pgsql-general
> On Jan 7, 2020, at 11:56 AM, Alan Hodgson <ahodgson@lists.simkin.ca> wrote:
>
> On Tue, 2020-01-07 at 11:47 -0900, Israel Brewster wrote:
>> One potential issue I just thought of with this approach: disk space.
>> Will I be doubling the amount of space used while both tables exist?
>> If so, that would prevent this from working - I don’t have that much
>> space available at the moment.
>
> The original update you planned would do that, too.
>
> You probably need to just do the update in batches and vacuum the table
> between batches.
>
>

Really? Why? With the update I am only changing data - I’m not adding any additional data, so the total size should
staythe same, right? I’m obviously missing something… :-) 

---
Israel Brewster
Software Engineer
Alaska Volcano Observatory
Geophysical Institute - UAF
2156 Koyukuk Drive
Fairbanks AK 99775-7320
Work: 907-474-5172
cell:  907-328-9145

>




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