How do I set up Pgpool?

How do I set up Pgpool?

Use the following steps to configure PCP:

1. Copy the pcp. conf. sample file to pcp.
2. Add an entry to the pcp.conf file in the following form: Toggle Wrap Copy. username:md5_password.
3. Restart the Pgpool service.
4. When issuing a PCP command, specify the PCP user name and the unencrypted form of the password: Toggle Wrap Copy.

What is Pgpool PostgreSQL?

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.

How do I restart Pgpool service?

On the primary server, restart pgpool:

1. # service pgpool restart. On the standby server, restart pgpool:
2. # service pgpool restart. Check the result:
3. # sudo -u postgres psql -h -p 9999 -c “show pool_nodes”

What is watchdog in Pgpool?

watchdog monitors responses of pgpool service rather than process. It sends queries to PostgreSQL via pgpool which is being monitored by watchdog and watchdog checks the response. Also watchdog monitors connections to up stream servers (application servers etc.)

How do you stop Pgpool?

Similarly, pgpool can be stopped in two ways:

1. By stopping the pgpool service at the command line as the root user: service pgpool stop.
2. By executing the pgpool command with the stop option: pgpool stop.

What is Pgpool?

pgpool-II is a middleware that works between PostgreSQL servers and a PostgreSQL database client.

What is watchdog in cluster?

Functioning of the Watchdog (heart_beat_watchdog_thread) A watchdog is started automatically each time a JobScheduler is started as part of a Cluster. Each watchdog runs as a seperate thread alongside its respective JobScheduler and monitors that JobScheduler’s heartbeat.

How do you use Pgpool?

To use md5 authentication, we need to register the user name and password in file pool_passwd . Execute command pg_md5 –md5auth –username= to regist user name and MD5-hashed password in file pool_passwd . If pool_passwd doesn’t exist yet, it will be created in the same directory as pgpool.

How do I connect to PostgreSQL to node?

This is an example index. js file that I put into a project I generated with npm init and installed node-postgres into: const { Pool, Client } = require(“pg”); const credentials = { user: “postgres”, host: “localhost”, database: “nodedemo”, password: “yourpassword”, port: 5432, }; // Connect with a connection pool.

What happens if I try to connect to pgpool-2?

If more than num_init_children clients try to connect to Pgpool-II, they are blocked (not rejected with an error, like PostgreSQL) until a connection to any Pgpool-II process is closed unless reserved_connections is set to 1 or more. Up to listen_backlog_multiplier * num_init_children can be queued.

What is the elastic IP for pgpool-II cluster?

For instance, the Elastic IP of your PgPool-II cluster is 55.55.55.55 , your client apps should now be connecting to 55.55.55.55 with port 9999. You can also try your connection by connecting to your PgPool-II cluster with psql :

Is the Unix domain socket accepted in pgpool-II?

Connections via UNIX domain socket are always accepted. This parameter can only be set at server start. The port number used by Pgpool-II to listen for connections. Default is 9999. This parameter can only be set at server start. The directory where the UNIX domain socket accepting connections for Pgpool-II will be created. Default is /tmp.

How does connection pooling work in PostgreSQL server?

Connection Pooling Pgpool-II maintains established connections to the PostgreSQL servers, and reuses them whenever a new connection with the same properties (i.e. user name, database, protocol version) comes in. It reduces the connection overhead, and improves system’s overall throughput.