Re: database response slows while pg_dump is running (8.4.2)

On Thu, Jun 10, 2010 at 3:22 PM, Andy Colson <andy(at)squeakycode(dot)net> wrote:
> On 6/10/2010 3:25 PM, Aleksey Tsalolikhin wrote:
>>
>> PostgreSQL 8.4.2 response time slows during pg_dump of a 14 GB database.
>>
>> Specifically, I am monitoring how long it takes to login to our Web
>> app - usually under 2 seconds, but when pg_dump is running, that
>> changes to 2 - 18 seconds.
>>
>> Is there any way I can keep my response fast but still get my pg_dump?
>>  Or should I move my pg_dump to a Slony-I slave?
>>
>> Best,
>> -at
>>
>
> It depends:
>        if you are cpu bound, you could try nice.
>        if you are network bound then dont pg_dump across the network
>        if you are io bound, pg_dump to a different drive, or pg_dump across
> the network.
>
>
> Isnt the slave a backup anyway?  Do you need another dump?

Replication does not equal backup. For instance how would you recover
from "delete from table" with no where clause with replication?