Connection pooling is a technique used to improve the performance of database applications by reusing database connections rather than creating new ones for each request. In PostgreSQL, connection pooling can be implemented using a third-party tool like PgBouncer or by using the built-in connection pooler, pgpool-II.
Here are the steps to implement connection pooling using pgpool-II:
- Step 1- Install pgpool-II: Install pgpool-II on the same server where the PostgreSQL database is running or on a separate server.
- Step 2 – Configure pgpool-II: Edit the pgpool.conf file to set the pool mode, maximum number of connections, and other configuration options.
- Step 3 – Configure PostgreSQL: Edit the postgresql.conf file to allow connections from pgpool-II.
- Step 4 – Start pgpool-II: Start pgpool-II using the pgpool executable.
- Step 5 – Test connection pooling: Connect to the PostgreSQL database using pgpool-II and test the connection pooling.
Here is a sample pgpool.conf file:
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#------------------------------------------------------------------------------ # CONNECTION POOLING #------------------------------------------------------------------------------ # - Pool mode - # Connection pool mode # 0: off # 1: session pool mode # 2: transaction pool mode pool_mode = 2 # - Connection settings - # Maximum number of connections max_pool = 100 # Connection timeout # 0: no timeout connection_life_time = 0 # - Authentication - # Authentication method # trust # plain # md5 # password auth_method = md5 # PostgreSQL connection string backend_hostname0 = localhost backend_port0 = 5432 backend_weight0 = 1 backend_database_name0 = mydatabase backend_username0 = myuser backend_password0 = mypassword |
After configuring the pgpool-II, start the pgpool-II service and connect to the PostgreSQL database using the pgpool-II connection pool.