1/12/2024 0 Comments Heroku postgres psequel![]() Otherwise, you will need to duplicate the behavior in your initializer to ensure consistent connection information: # config/unicorn.rbĪctiveRecord::Base.establish_connection(config) If you are using Rails 4.1+ then ActiveRecord::Base.establish_connection will use the connection information stored in config/database.yml. For this reason it’s necessary to disconnect in your master process in the before_fork and then re-establish the connection in an after_fork block: # config/unicorn.rbĪctiveRecord::!ĪctiveRecord::Base.establish_connection # Establish connection is not needed for Rails 5.2+ įor Unicorn, this connection setup should be in addition to the normal recommended configuration as described in the Deploying Rails Applications With Unicorn guide. Multi-process serversįor a forking server such as Unicorn, the master process will boot your rails applications (and execute any initializers) and then fork workers. When using multiple processes each process will contain its own pool so as long as no worker process has more than ENV then this setting should be adequate. If you are using the Puma web server we recommend setting the pool value to equal ENV. The initializer method can cause confusion over what is happening and is the source of numerous support tickets. Using an initializer requires duplicating code if you are using a forking webserver such as Unicorn or Puma (in hybrid mode). If you are already using an initializer, you should switch over to the database.yml method as soon as possible. _configurationĬonfig = ENV || ENV || 5ĪctiveRecord::Base.establish_connection(config) # Establish connection is not needed for Rails 5.2+ _initialize doĪctiveRecord::nnection_pool.disconnect!Ĭonfig = ActiveRecord::nfigurations || # Use config/database.yml method if you are using Rails 4.1+ # config/initializers/database_connection.rb Otherwise if you are using an older version of Rails you will need to use an initializer. When your Rails application boots, it will execute the code in your initializer and establish the connection with your customizations.įor Rails 4.1+ you can set these values directly in your config/database.yml production: Threaded serversįor servers that achieve concurrency via threads we recommend using an initializer to configure your database pool. While the means are similar, the location of your connect setup can vary for threaded vs. To avoid this error you can change the size of your connection pool manually by customizing your connection settings. The max pool size is currently 5 consider increasing it It may look something like this: ActiveRecord::ConnectionTimeoutError - could not obtain a database connection within 5 seconds. When it cannot get a connection, a timeout error will be thrown. If you try to use more connections than are available, Active Record will block and wait for a connection from the pool. The default maximum size of the database connection pool is 5. Active Record limits the total number of connections per application through a database setting pool this is the maximum size of the connections your app can have to the database. ![]() Connection poolīy default Rails (Active Record) will only create a connection when a new thread or process attempts to talk to the database through a SQL query. To accommodate this, Active Record provides a connection pool that can hold several connections at a time. Each thread or process requires a different connection to the database. ![]() When increasing concurrency by using a multi-threaded web server like Puma, or multi-process web server like Unicorn, you must be aware of the number of connections your app holds to the database and how many connections the database can accept.
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