Its basically a middleware tool to do connection pool between client and POSTGRESQL. I want to get some more details about it so that i can start more working on it.
I was trying to understand the concept of Pgpool but got less information from internet so it would be great if someone can ellaborate it more.
CodePudding user response：
Pgpool is a middleware that sits between a PostgreSQL database and its clients, providing connection pooling, load balancing, and failover services.
It includes the following key features:
- Connection pooling: Pgpool maintains a pool of database connections, reducing the overhead of establishing a new connection for each client request.
- Load balancing: Pgpool can distribute incoming client requests across multiple database servers, improving the overall performance and availability of the system.
- Failover management: Pgpool can detect if a database server becomes unavailable and automatically redirect client requests to a standby server, ensuring high availability.
- Query caching: Pgpool can cache query results, reducing the load on the database server and improving performance for repeat requests.
Other features include transaction management, query rewriting, and health checks.
CodePudding user response：
You can find details on it on their official website here. The concept of pgpool is to have high availability. Meaning that multiple users (in millions/billions) are able to access data in postgres without any delay. This is achieved by creating replications of the database using stream replication. Now, we have a primary database or also called primary node and the rest are the secondary node. How data is read/written.
- Pg-Pool gets the query.
- Pg-Pool parses that query.
- After parsing the query pg-pool makes a decision whether the query is a write or read query.
- If a query is read, then the query is sent to the one of the secondary nodes, else the write queries are sent to the primary nodes.
This way we provide high availability uaing pg-pool.