I have a primary and backup database running 12.10 and synced with streaming replication. I have a simple table that is returning different results for the same query in the primary vs backup database.
On the primary DB:
> select tag::bytea, * from sentinel where tag = 'quote_merge_locs_mnj_NSX_20220719';
tag | tag | event_ts
----------------------------------------------------------------------+-----------------------------------+-------------------------------
\x71756f74655f6d657267655f6c6f63735f6d6e6a5f4e53585f3230323230373139 | quote_merge_locs_mnj_NSX_20220719 | 2022-07-19 20:29:14.114238-05
(1 row)
On the backup:
> select tag::bytea, * from sentinel where tag = 'quote_merge_locs_mnj_NSX_20220719';
tag | tag | event_ts
-----+-----+----------
(0 rows)
> select tag::bytea, * from sentinel where tag = 'quote_merge_locs_mnj_NSX_20220719' collate "C";
tag | tag | event_ts
----------------------------------------------------------------------+-----------------------------------+-------------------------------
\x71756f74655f6d657267655f6c6f63735f6d6e6a5f4e53585f3230323230373139 | quote_merge_locs_mnj_NSX_20220719 | 2022-07-19 20:29:14.114238-05
(1 row)
Can anyone explain why the backup does not show the row without specifying a collation?
The primary is running CentOS 7.4, the backup is running CentOS 8. The backup was created from a basebackup. The postgres binaries were built on the OS on which they're running. Neither were built with ICU (which I didn't know existed until tracking this down...). Both databases show LC_COLLATE=en_US.UTF-8.
The query "select * from pg_collation where collname like '%en_US%';" returns identical results for both databases.
I'm concerned that somehow I've created a backup that is not compatible in some mysterious way with my primary.
Can anyone provide any insight on what is going on?
Thank you,
-Kelly
