Database replication
Setting up database replication provides the following benefits:
- Provides data backup
- Enables data analysis without affecting the master database
- Scalability
MySQL databases replicate asynchronously, which means slaves do not need to be connected permanently to receive updates from the master.
Configure database replication
An in-depth discussion of database replication is beyond the scope of this guide. To set it up, you can consult a resource like:
Commerce provides sample MySQL configurations for your slave databases. A simple configuration is provided with the ResourceConnections class README.md.
The following is more advanced and is provided for your information only:
return array (
//...
'db' =>
array (
'connection' =>
array (
'indexer' =>
array (
'host' => 'default-master-host',
'dbname' => 'magento',
'username' => 'magento',
'password' => 'magento',
'active' => '1',
'persistent' => NULL,
),
'default' =>
array (
'host' => 'default-master-host',
'dbname' => 'magento',
'username' => 'magento',
'password' => 'magento',
'active' => '1',
),
'checkout' =>
array (
'host' => 'checkout-master-host',
'dbname' => 'checkout',
'username' => 'magento',
'password' => 'magento',
'model' => 'mysql4',
'engine' => 'innodb',
'initStatements' => 'SET NAMES utf8;',
'active' => '1',
),
'sales' =>
array (
'host' => 'sales-master-host',
'dbname' => 'sales',
'username' => 'magento',
'password' => 'magento',
'model' => 'mysql4',
'engine' => 'innodb',
'initStatements' => 'SET NAMES utf8;',
'active' => '1',
),
),
'slave_connection' =>
array (
'default' =>
array (
'host' => 'default-slave-host',
'dbname' => 'magento',
'username' => 'read_only',
'password' => 'password',
'active' => '1',
),
'checkout' =>
array (
'host' => 'checkout-slave-host',
'dbname' => 'checkout',
'username' => 'read_only',
'password' => 'password',
'model' => 'mysql4',
'engine' => 'innodb',
'initStatements' => 'SET NAMES utf8;',
'active' => '1',
),
'sales' =>
array (
'host' => 'sales-slave-host',
'dbname' => 'sales',
'username' => 'read_only',
'password' => 'password',
'model' => 'mysql4',
'engine' => 'innodb',
'initStatements' => 'SET NAMES utf8;',
'active' => '1',
),
),
'table_prefix' => '',
),
//.......
Performance improvement
To improve the performance of master-slave replication, you can filter some tables on slave instances. We recommend filtering all temporary tables with name pattern search\_tmp\_% that are used for catalog search.
To do this, add the following line to your my.cnf file on your slave instances:
replicate-wild-ignore-table=%.search\_tmp\_%