Magento_ResourceConnections
Magento\ResourceConnections module adds a mechanism to segregate database connections between master and slave database servers based on the request type.
For each master database connection (except the indexer connection) that are configured in db/connection section of app/etc/env.php you can add one slave connection that can be configured in db/slave_connection. Configuration format is the same as db/connection. Slave connection name must be the same as associated master connection name. To enable slave connections for specific resources create a slave connection configuration by adding slave_connection node as below:
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<?php
return array (
//...
'db' =>
array (
'connection' =>
array (
'default' =>
array (
'host' => 'default-master-host',
'dbname' => 'magento',
'username' => 'magento',
'password' => 'magento',
'active' => '1',
),
),
'slave_connection' =>
array (
'default' =>
array (
'host' => 'default-slave-host',
'dbname' => 'magento',
'username' => 'read_only',
'password' => 'password',
'active' => '1',
),
),
'table_prefix' => '',
),
//.......
To add slave connection for resources other than ‘default’ repeat the step and add to db/slave_connection new element with same name and slave configuration for specified resource. Config structure retains backward compatibility if module is turned off.
WARNING: ‘indexer’ connection is not designed to have slave configuration.
