| From: | Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> |
|---|---|
| To: | Surafel Temesgen <surafel3000(at)gmail(dot)com> |
| Cc: | Ryan Lambert <ryan(at)rustprooflabs(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Rémi Lapeyre <remi(dot)lapeyre(at)lenstra(dot)fr>, Eli Marmor <eli(at)netmask(dot)it>, David Steele <david(at)pgmasters(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Georgios <gkokolatos(at)protonmail(dot)com>, Vik Fearing <vik(dot)fearing(at)enterprisedb(dot)com> |
| Subject: | Re: WIP: System Versioned Temporal Table |
| Date: | 2021-01-14 21:27:24 |
| Message-ID: | CANbhV-HceeO5=L8euquJNh5hR-vY5_TSRj9mLyjOHZsLURWhYg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Jan 14, 2021 at 5:42 PM Surafel Temesgen <surafel3000(at)gmail(dot)com> wrote:
>
> Hi Simon,
> Thank you for all the work you does
No problem.
> On Mon, Jan 11, 2021 at 5:02 PM Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com> wrote:
>>
>>
>>
>> * Anomalies around use of CURRENT_TIMESTAMP are not discussed or resolved.
>> Probably need to add a test that end_timestamp > start_timestamp or ERROR,
>> which effectively enforces serializability.
>>
>
>
> This scenario doesn't happen.
Yes, I think it can. The current situation is that the Start or End is
set to the Transaction Start Timestamp.
So if t2 starts before t1, then if t1 creates a row and t2 deletes it
then we will have start=t1 end=t2, but t2<t1
Your tests don't show that because it must happen concurrently.
We need to add an isolation test to show this, or to prove it doesn't happen.
> There are no possibility of a record being deleted or updated before inserting
Agreed, but that was not the point.
--
Simon Riggs http://www.EnterpriseDB.com/
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