Re: Question about locking

On 8/7/22 00:30, Frank Millman wrote:
> Hi all
>
> Apologies if this is an FAQ, but I could not find the answer I was looking 
> for.
>
> I want to run two SELECTs, one immediately after the other.
>
> I want to ensure that no other process updates the database in between the 
> two.
>
> What is the best way to achieve this?

You probably want to put the queries in a Repeatable Read transaction, or 
even a READ ONLY serialized transaction.
https://www.postgresql.org/docs/12/transaction-iso.html#XACT-REPEATABLE-READ
https://www.postgresql.org/docs/12/transaction-iso.html#XACT-SERIALIZABLE
https://www.postgresql.org/docs/12/sql-set-transaction.html

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