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<?php
global $w3tc_dbcluster_config;
$w3tc_dbcluster_config = array(
/**
* Persistent (bool)
*
* This determines whether to use mysql_connect or mysql_pconnect. The effects
* of this setting may vary and should be carefully tested.
* Default: false
*/
'persistent' => false,
/**
* check_tcp_responsiveness
*
* Enables checking TCP responsiveness by fsockopen prior to mysql_connect or
* mysql_pconnect. This was added because PHP's mysql functions do not provide
* a variable timeout setting. Disabling it may improve average performance by
* a very tiny margin but lose protection against connections failing slowly.
* Default: true
*/
'check_tcp_responsiveness' => true,
/**
* Default is to always (reads & writes) use the master db when user is in administration backend.
* Set use_master_in_backend to false to disable this behavior.
*
* WARNING: if your cluster has any replication delays then when this is enabled, you may not see
* any admin changes until the replication catches up with the change written to your master
* server and will see old content/configuration until that point in time - You should test this
* in your environment fully.
*/
'use_master_in_backend' => true,
/**
* This set the charset that the db connection should use.
* If DB_CHARSET is set there is no need to set $wpdb_cluster->charset.
*/
'charset' => DB_CHARSET,
/**
* This set the charset that the db connection should use.
* If DB_COLLATE is set there is no need to set $wpdb_cluster->collate.
*/
'collate' => DB_COLLATE,
/** Configuration Functions **/
/**
* database is an associative array with these parameters:
* host (required) Hostname with optional :port. Default port is 3306.
* user (required) MySQL user name.
* password (required) MySQL user password.
* name (required) MySQL database name.
* read (optional) Whether server is readable. Default is 1 (readable).
* Also used to assign preference.
* write (optional) Whether server is writable. Default is 1 (writable).
* Also used to assign preference in multi-master mode.
* dataset (optional) Name of dataset. Default is 'global'.
* timeout (optional) Seconds to wait for TCP responsiveness. Default is 0.2
* connect_function (optional) connection function to use
* zone (optional) name of zone where server is located.
* Used for web applications hosted on cluster
*
* Read & write
* A database definition can include 'read' and 'write' parameters. These
* operate as boolean switches but they are typically specified as integers.
* They allow or disallow use of the database for reading or writing.
*
* A master database might be configured to allow reading and writing:
* 'write' => true,
* 'read' => true,
* while a slave would be allowed only to read:
* 'write' => false,
* 'read' => true,
*
* It might be advantageous to disallow reading from the master, such as when
* there are many slaves available and the master is very busy with writes.
* 'write' => true,
* 'read' => false,
*
*/
'databases' => array(
'master' => array(
'host' => DB_HOST, // If port is other than 3306, use host:port.
'user' => DB_USER,
'password' => DB_PASSWORD,
'name' => DB_NAME
)
),
/**
* Zones (for web applications hosted on cluster)
*
* When your databases are located in separate physical locations there is
* typically an advantage to connecting to a nearby server instead of a more
* distant one. This can be configured by defining zones.
*
* Add 'zone' parameter to add_server call:
* 'zone' => 'A'
*
* Plugin determines where application is running by checking
* $_SERVER['SERVER_NAME'] system variable against defined in zone definition
* and then connects to servers following defined order:
* Value '*' can be used as 'server_names' item to indicate any server.
*
* 'zones' => array(
* 'zone_name' => array(
* 'server_names' => array('host1', 'host1.1'),
* 'zone_priorities' => array('A', 'B')
* )
* )
*
* As a result it will try to connect to servers in zone A first, then servers
* in zone B.
*/
'zones' => array(
),
/**
* Filters
*
* Filters are executed on <tag> event in the order in which they are
* registered until one of them returns something other than null.
*
* Tags:
* 'dataset' - fitler will be called with two arguments and expected to
* return a dataset to connect to
* $dataset = $callback($table, &$wpdb);
* 'blog_dataset' - fitler will be called with argument $blog_id and
* expected to return a dataset to connect to.
* Used when data are partitioned at blog level
* $dataset = $callback($blog_id);
*
* 'filters' => array(
* array(
* 'tag' => 'tag_to_add',
* 'function_to_add' => 'function_name'
* );
*/
'filters' => array(
)
);
/**
* This adds the same server again, only this time it is configured as a slave.
* The last three parameters are set to the defaults but are shown for clarity.
*/
/*
$w3tc_dbcluster_config = array(
'databases' => array(
'master' => array(
'host' => DB_HOST,
'user' => DB_USER,
'password' => DB_PASSWORD,
'name' => DB_NAME
),
'slave' => array(
'host' => DB_HOST,
'user' => DB_USER,
'password' => DB_PASSWORD,
'name' => DB_NAME,
'write' => false,
'read' => true,
'timeout' => 0.2,
));
*/
/** Sample Configuration 2: Partitioning **/
/**
* This example shows a setup where the multisite blog tables have been
* separated from the global dataset.
*/
/*
$w3tc_dbcluster_config = array(
'databases' => array(
'master' => array(
'host' => 'global.db.example.com',
'user' => 'globaluser',
'password' => 'globalpassword',
'name' => 'globaldb',
),
'partition2' => array(
'host' => 'blog.db.example.com',
'user' => 'bloguser',
'password' => 'blogpassword',
'name' => 'blogdb',
'dataset' => 'blog2',
),
)
'filters' => array(
array(
'tag' => 'blog_dataset',
'function_to_add' => 'my_db_callback'
)
)
);
function my_db_callback($blog_id, $wpdb_cluster) {
if ($blog_id > 5))
return 'blog2';
}
*/