Re: Replication sequence

Il giorno lun 15 feb 2021 alle ore 20:40 Loles <lolesft(at)gmail(dot)com> ha
scritto:

> One thing is the number of records in the table and another is the current
> value of the sequence.
>
> Execute:
>
> select max (field) from bobo.menu_pages;
>
> In both master and slave server.
>
> What give you back?
>
> "field" is the data that belongs to the sequence.
>
>
>
> El lun., 15 feb. 2021 18:55, Paolo Saudin <paolosaudin(at)gmail(dot)com>
> escribió:
>
>> Hi all,
>> I have two servers, a primary and a secondary one with a streaming
>> replica setup.
>> Today I noticed that some sequences are not lined-up, the replica ones
>> are well ahead, while the records number is the same. How is it possible?
>>
>> Thanks,
>> Paolo
>>
>> --
>> -- primary server
>> --
>> postgres(at)db-srv1:~$ psql
>> psql (9.5.19)
>> cf-db-srv1:5432 postgres(at)rete_llpp=# SELECT last_value FROM
>> bobo.menu_pages_mp_id_seq;
>> ┌────────────┐
>> │ last_value │
>> ├────────────┤
>> │ 74 │
>> └────────────┘
>> cf-db-srv1:5432 postgres(at)rete_llpp=# select count(*) from
>> bobo.menu_pages;
>> ┌───────┐
>> │ count │
>> ├───────┤
>> │ 74 │
>> └───────┘
>>
>> --
>> -- replica server
>> --
>> postgres(at)db-srv2:~$ psql
>> psql (9.5.24)
>> cf-db-srv2:5433 postgres(at)rete_llpp=# SELECT last_value FROM
>> bobo.menu_pages_mp_id_seq;
>> ┌────────────┐
>> │ last_value │
>> ├────────────┤
>> │ 105 │
>> └────────────┘
>> cf-db-srv2:5433 postgres(at)rete_llpp=# select count(*) from
>> bobo.menu_pages;
>> ┌───────┐
>> │ count │
>> ├───────┤
>> │ 74 │
>> └───────┘
>>
>>
Hi, I checked and the number of records are identical,

cf-db-srv1:5432 postgres(at)rete_llpp=# select max(mp_id) from bobo.menu_pages;
┌─────┐
│ max │
├─────┤
│ 74 │
└─────┘

cf-db-srv2:5433 postgres(at)rete_llpp=# select max(mp_id) from bobo.menu_pages;
┌─────┐
│ max │
├─────┤
│ 74 │
└─────┘
Thank you,
Paolo