How to Set Application_name For Postgres Connections In Elixir?

To set the application name for Postgres connections in Elixir, you can use the :pool option when configuring the Postgrex connection pool. Simply include the application_name key with the desired value in the configuration options. This will assign the specified application name to all connections made through that pool. Additionally, you can also define a Postgrex.Protocol option with :app_name key-value pair to set the application name for individual connections.

How to set application_name for postgres connections in elixir?

To set the application_name for PostgreSQL connections in Elixir, you can provide the application_name as part of the connection options when establishing a connection using the Postgrex library.

Here's an example of how you can set the application_name when establishing a connection to a PostgreSQL database in Elixir:

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# Add the Postgrex library to your mix.exs dependencies
defp deps do
  [
    {:postgrex, "~> 0.15"}
  ]
end

# Establish a connection to the PostgreSQL database
{:ok, pid} = Postgrex.start_link(
  hostname: "localhost",
  username: "username",
  password: "password",
  database: "database_name",
  application_name: "my_awesome_app"
)

# Now the application_name "my_awesome_app" will be set for all connections made through this PostgreSQL connection

By providing the application_name option in the connection options, you can set a custom name for the connection that will be displayed in the pg_stat_activity view in PostgreSQL. This can be helpful for identifying the source of connections in a multi-tenant application or monitoring connections from different services.

What is the default application_name for postgres connections in elixir?

The default application_name for PostgreSQL connections in Elixir is psql.

What is the recommended approach for handling connection pool configurations with custom application_names in elixir for postgres connections?

The recommended approach for handling connection pool configurations with custom application_names in Elixir for Postgres connections is to use the DBConnection library, which provides a flexible way to manage database connections and connection pooling.

To set the application_name parameter for each connection in the pool, you can use the :options parameter in the Postgrex connection configuration. Here's an example of how you can achieve this:

1. Add db_connection and postgrex to your mix.exs dependencies:

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defp deps do
  [
    {:db_connection, "~> 2.4"},
    {:postgrex, "~> 0.15"}
  ]
end

1. Configure your Postgres database connection in your application's configuration:

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config :my_app, MyApp.Repo,
  username: "postgres",
  password: "postgres",
  hostname: "localhost",
  database: "my_db",
  pool_size: 10,
  application_name: "my_app"

1. In your application's repo module, use the DBConnection library to set the application_name parameter for each connection in the pool:

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defmodule MyApp.Repo do
  use Ecto.Repo, otp_app: :my_app
  use DBConnection

  def start_link(opts) do
    DBConnection.start_link(__MODULE__, opts, name: {:local, __MODULE__})
  end

  def init(opts) do
    {:ok, Keyword.put(opts, :name, Keyword.get(opts, :application_name))}
  end
end

By following this approach, you can easily configure custom application_name for each connection in the connection pool, which can be useful for monitoring and troubleshooting purposes.

What is the best practice for setting application_name in elixir for postgres connections?

The best practice for setting application_name in Elixir for PostgreSQL connections is to set it in the pool configuration when setting up the connection.

Here is an example of how you can set the application_name in the pool configuration in Ecto, a popular Elixir database library:

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config :my_app, MyApp.Repo,
  adapter: Ecto.Adapters.Postgres,
  username: "postgres",
  password: "password",
  database: "my_database",
  hostname: "localhost",
  pool_size: 10,
  pool: Ecto.Adapters.SQL.Sandbox,
  application_name: "my_app_name"

By setting the application_name in the pool configuration, you will ensure that all connections made by your application to the PostgreSQL database will have the specified application_name set. This can be useful for identifying the source of queries and connections in PostgreSQL logs and monitoring tools.