What is PG pool?

Posted on by Muna Meyer

What is PG pool?

Pgpool-II is a proxy software that sits between PostgreSQL servers and a PostgreSQL database client. It does that by distributing SELECT queries among available servers, improving the system’s overall throughput. In an ideal scenario, read performance could improve proportionally to the number of PostgreSQL servers.

What is Pgpool for?

PgPool is a session-based connection pooler, which maintains already-established connections to the database by reusing them. When configured, PgPool will keep a small number of database sessions spawned and ready to serve application session requests.

How do I connect to Pgpool?

To enable Pgpool-II authentication:

  1. Copy the pool_hba. conf.
  2. Modify the pool_hba. conf file, specifying authentication information for servers or users you want to connect.
  3. Modify the pgpool. conf file, setting the enable_pool_hba parameter to on .
  4. Restart Pgpool-II to reload the Pgpool-II configuration files.

Where is PG pool?

PG Pool is located at 3301 Buchanan Street Mount Rainier, MD 20712-1189 The pool has some off-street parking, with more available at the local elementary school and in surrounding streets.

How do I start Pgpool?

1. Let’s Begin!

  1. 1.1. Installing pgpool-II. Installing pgpool-II is very easy.
  2. 1.2. Configuration Files. pgpool-II configuration parameters are saved in the pgpool.
  3. 1.3. Configuring PCP Commands.
  4. 1.4. Preparing Database Nodes.
  5. 1.5. Starting/Stopping pgpool-II.

How do I check Pgpool version?

SHOW POOL_VERSION — displays a string containing the Pgpool-II release number.

What is pool and client?

Client is one static connection. Pool manages a dynamic list/pool of Client objects, with automatic re-connect functionality 😉 Normally, you would just create a single Pool object and use it 😉 – vitaly-t.

Why should I use PgBouncer?

For those who do not know, PgBouncer a lightweight connections pooler for PostgreSQL. It reduces PostgreSQL resource consumption (memory, backends, fork). It supports online restart/upgrade without dropping client connections. It allows PostgreSQL restart/upgrade without dropping client connections.

Where do I put PgBouncer?

PgBouncer Setup

  1. Get Started. Here’s the flow: Web app -> PgBouncer -> Postgres.
  2. Configure PgBouncer. Edit /etc/pgbouncer/pgbouncer.ini .
  3. Start the Service. sudo service pgbouncer start.
  4. Test. psql -h 127.0.0.1 -p 6432 -d YOUR-DBNAME -U USERNAME1.
  5. Increase File Limits.
  6. App Changes.
  7. Statement Timeouts.
  8. Congrats.

What is Pgpool and PgBouncer?

Pgpool-II does support passwordless authentication through PAM or SSL-certificates. However, these must be set up outside the PostgreSQL system, while PgBouncer can offload this to the PostgreSQL server. Administration. PgBouncer provides a virtual database that reports various useful statistics.

How do I know if Pgpool is running?

PGPOOL SHOW will display the current value of Pgpool-II configuration parameters. This command is similar to the SHOW command in PostgreSQL with an addition of PGPOOL keyword to distinguish it from the PostgreSQL SHOW command.