Re: Testing Technique when using a DB

On 2013-03-13, Joe Van Dyk <joe(at)tanga(dot)com> wrote:
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> On Wed, Mar 13, 2013 at 8:47 AM, Steve Crawford <
> scrawford(at)pinpointresearch(dot)com> wrote:
>
>> On 03/12/2013 09:05 PM, Perry Smith wrote:
>>
>>> To all who replied:
>>>
>>> Thank you. ...
>>>
>>>
>>> I had not seriously considered pg_dump / pg_restore because I assumed it
>>> would be fairly slow but I will experiment with pg_restore and template
>>> techniques this weekend and see which ones prove viable.
>>>
>>
>> Another possibility a bit outside my area of expertise but what about a VM
>> image configured to your needs that you just spin up as needed then discard
>> when done (i.e. always spinning up the same starting image)?
>>
>>
> I'd guess the OP is running hundreds of tests, where the data needs to be
> reverted/reset after each test, and each individual test might run in, say,
> 0.1 seconds. This is a really common technique when testing web apps. I
> don't think you'd want to start a VM for each of these tests, especially
> when the tests are small and specific.

A vm rewinds to a snapshot in a few seconds this will likely be faster than
any other way* if the database is large.

*except possibly a similar trick using ZFS snapshots may be faster.

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