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A brief summary of [Percona Community Forum][1] since 2026-09-28 01:05:24 UTC

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  ### Popular Topics

    [Pt-online-schema-change 3.7.1 exhausts max_user_connections on MySQL 8.4 replica lag checks][2]

      Environment: 

pt-online-schema-change 3.7.1-4 (percona-toolkit)
Primary: Percona Server 8.0.36-28
Replicas: MySQL 8.4
OS: Linux (x86_64)

Replica discovery: --recursion-method dsn=“D=,t=dsns”

Primary: Percona Server 8.0.36-28
Replicas: MySQL 8.4
OS: Linux (x86_64)
Replica discovery: --recursion-method dsn=“D=,t=dsns”

We upgraded from an earlier version of percona-toolkit to 3.7.1 specifically to support MySQL 8.4 replicas, which removed SHOW SLAVE STATUS in favour of SHOW REPLICA STATUS. The older version could not check lag on 8.4 replicas at all. The previous version was smoothly working but after upgrade we have encountered so many issues specifically related to replica status/lag checking using dsns table. I applied some workarounds but most recent one is most annoying. 
Issue: 
We are seeing max_user_connections exhaustion during execution against a table with 6 replicas in the DSN table: 
Error while waiting for replica lag: Cannot connect to MySQL: DBI connect(‘…host=<replica...

    
    [Permissions errors when trying to install mariadb using mariadb-install-db][3]

      I have kubuntu 26.04 and I’m trying to install 3 instances of mariadb using mariadb-install-db. I went through several tutorials, which are all slightly different: 

https://medium.com/@omkarmanjrekar/running-multiple-mysql-instances-on-ubuntu-4af059aad5ae
mariadbd-multi | Server | MariaDB Documentation
Ubuntu 22.04 Multi Mariadb install - HackMD
6.3.4 mysqld_multi — Manage Multiple MySQL Servers
https://medium.com/@omkarmanjrekar/running-multiple-mysql-instances-on-ubuntu-4af059aad5ae

I don’t want to install these instances on my main partition, as the file size could be hundreds of GB and my main drive/partition isn’t big enough. I have a 2TB drive/partition I want to put them on. These tutorials mostly recommend putting the instances in /var/run on the main partition, so I’m not sure if that could be part of the problem. 
I created 2 folders on the 2TB drive: 
/media/Crucial2TB/mariadb1/
/media/Crucial2TB/mariadb2/


I set both to 755 permissions and the owner and group to “mysql” 
...

    
    [LaserFocus - Keeping Our Goals in Sight | Percona Community][4]

      Every planning cycle starts the same way. We sit together, agree on a handful of goals and everyone leaves the meeting motivated. A few weeks later, Jira holds hundreds of tickets, new requests come in every day, and the question “are we actually working on what we agreed on?” gets harder and harder to answer. 

This is a companion discussion topic for the original entry at https://percona.community/blog/2026/09/29/laserfocus-keeping-our-goals-in-sight/

    

  







[1]: https://forums.percona.com/
[2]: https://forums.percona.com/t/pt-online-schema-change-3-7-1-exhausts-max-user-connections-on-mysql-8-4-replica-lag-checks/41300
[3]: https://forums.percona.com/t/permissions-errors-when-trying-to-install-mariadb-using-mariadb-install-db/41302
[4]: https://forums.percona.com/t/laserfocus-keeping-our-goals-in-sight-percona-community/41298
[5]: https://forums.percona.com/



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5 October 2026 · 01:00 UTC