The proxysql-admin Tool with ProxySQL 2.0.x

The ProxySQL and ProxySQL-Admin documentation provides information on installing and running ProxySQL.

ProxySQL is a tool that performs like a proxy between Percona XtraDB Cluster and your client application. ProxySQL manages a connection pool, which caches your connections and keeps the connections open for future requests. ProxySQL is designed to run continuously without being restarted.

Without a connection pool, each SQL request opens a connections to the remote node. When the SQL request is complete, the connection is closed. A new one is opened on the next SQL request.

ProxySQL maintains the connection pool. The pool allows a certain number of connections to remain open. A connection is reused or closed if not reused within a period. You connect to the proxy and the tool forwards your requests to the cluster.

ProxySQL runs as a daemon watched by a monitoring process which can restart ProxySQL in case of an unexpected exit to minimize downtime. The daemon accepts incoming traffic from MySQL clients and forwards the traffic to backend MySQL servers.

The configuration options include runtime parameters, server grouping, and traffic-related parameters. Many of the settings can be done at runtime using queries that are similar to SQL statements.