# ProxySQL 2.5.1 and ProxySQL admin tools (2023-04-17)

| Release date | April 17, 2023 |
|---|---|
| Install instructions | [ProxySQL and proxysql-admin](https://docs.percona.com/proxysql/install-v2.html) |
| Download this version | [ProxySQL 2](https://www.percona.com/download-proxysql) using the [instructions](https://docs.percona.com/proxysql/where-to-download-proxysql.html)|

[ProxySQL](https://proxysql.com/) is a high-performance proxy for MySQL and MySQL-compatible database servers such as Percona Server for MySQL and MariaDB. It acts as an intermediary for client requests seeking resources from the database. ProxySQL was created for the database administrator as a solution for complex replication topology issues. 

You can [download the original ProxySQL from GitHub](https://github.com/sysown/proxysql/releases). The [ProxySQL documentation](https://proxysql.com/documentation/) provides information on installing and running ProxySQL. 

The [ProxySQL Admin (proxysql-admin)](proxysql-admin-tool-v2-config.md) tool simplifies the configuration of Percona XtraDB Cluster nodes with ProxySQL. [ProxySQL Admin 2.x.x](proxysql-admin-tool-functions.md) supports Percona XtraDB Cluster without custom scripts.

The [ProxySQL 2.x.x and pxc_scheduler_handler](psh-overview.md) tool can automatically perform a failover due to node failures, service degradation, or maintenance. The pxc_scheduler_handler tool has different features and capabilities than ProxySQL admin. Do not use the options from one tool in the other tool. Mixing the options may cause unintended results.

## Release highlights

Compared to the previous ProxySQL 2.4.8 release, this release includes all improvements and bug fixes available in ProxySQL 2.5.0 and ProxySQL 2.5.1.

The improvements and bug fixes introduced by ProxySQL 2.5.0 and included in this release are:

* Native Group Replication monitoring is supported for MySQL-8. 

* Added a new `mysql_hostgroup_attributes` feature with support for the following attributes:

    * `mysql_hostgroup_attributes.multiplex`

    * `mysql_hostgroup_attributes.free_connections_pct`

    * `mysql_hostgroup_attributes.throttle_connections_per_sec`

* Fixed memory leaks related to `load_mysql_servers_to_runtime`.

The improvements and bug fixes introduced by ProxySQL 2.5.1 and included in this release are:

* `mysql_hostgroup_attributes.init_connect` option is supported.

* Multiple binlog clients support consuming events via the same `username`.

* Fix for when connections were killed due to invalid `max_transaction_time` tracking.

For more information on these items and other improvements and bug fixes, see the ProxySQL [2.5.0 release notes](https://github.com/sysown/proxysql/releases/tag/v2.5.0) and the ProxySQL [2.5.1 release notes](https://github.com/sysown/proxysql/releases/tag/v2.5.1).

ProxySQL Admin and pxc_scheduler_handler have not changed since the previous release.

## Useful links

* The [ProxySQL and ProxySQL admin tools GitHub location](https://github.com/percona/proxysql-admin-tool)

* [Contribute to the documentation](https://github.com/percona/proxysql-admin-tool-doc/blob/main/contributing.md)

* For [training](https://www.percona.com/training), contact [Percona Training - Start learning now](https://learn.percona.com/contact-me)