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Current File : /nas/content/live/attorneyexperi/wp-content/plugins/hyperdb-1-1/db-config.php
<?php

/**
 * HyperDB configuration file
 *
 * This file should be installed at ABSPATH/db-config.php
 *
 * $wpdb is an instance of the hyperdb class which extends the wpdb class.
 *
 * See readme.txt for documentation.
 */

/**
 * Introduction to HyperDB configuration
 *
 * HyperDB can manage connections to a large number of databases. Queries are
 * distributed to appropriate servers by mapping table names to datasets.
 *
 * A dataset is defined as a group of tables that are located in the same
 * database. There may be similarly-named databases containing different
 * tables on different servers. There may also be many replicas of a database
 * on different servers. The term "dataset" removes any ambiguity. Consider a
 * dataset as a group of tables that can be mirrored on many servers.
 *
 * Configuring HyperDB involves defining databases and datasets. Defining a
 * database involves specifying the server connection details, the dataset it
 * contains, and its capabilities and priorities for reading and writing.
 * Defining a dataset involves specifying its exact table names or registering
 * one or more callback functions that translate table names to datasets.
 */

/** Variable settings **/

/**
 * save_queries (bool)
 * This is useful for debugging. Queries are saved in $wpdb->queries. It is not
 * a constant because you might want to use it momentarily.
 * Default: false
 */
$wpdb->save_queries = false;

/**
 * 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
 */
$wpdb->persistent = false;

/**
 * max_connections (int)
 * This is the number of mysql connections to keep open. Increase if you expect
 * to reuse a lot of connections to different servers. This is ignored if you
 * enable persistent connections.
 * Default: 10
 */
$wpdb->max_connections = 10;

/**
 * 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
 */
$wpdb->check_tcp_responsiveness = true;

/** Configuration Functions **/

/**
 * $wpdb->add_database( $database );
 *
 * $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. See "Network topology".
 * 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
 * lag_threshold (optional) The minimum lag on a slave in seconds before we consider it lagged. 
 *							Set null to disable. When not set, the value of $wpdb->default_lag_threshold is used.
 */

/**
 * $wpdb->add_table( $dataset, $table );
 *
 * $dataset and $table are strings.
 */

/**
 * $wpdb->add_callback( $callback, $callback_group = 'dataset' );
 *
 * $callback is a callable function or method. $callback_group is the
 * group of callbacks, this $callback belongs to.
 *
 * Callbacks are executed in the order in which they are registered until one
 * of them returns something other than null. 
 *
 * The default $callback_group is 'dataset'. Callback in this group 
 * will be called with two arguments and expected to compute a dataset or return null.
 * $dataset = $callback($table, &$wpdb);
 *
 * Anything evaluating to false will cause the query to be aborted.
 *
 * For more complex setups, the callback may be used to overwrite properties of
 * $wpdb or variables within hyperdb::connect_db(). If a callback returns an
 * array, HyperDB will extract the array. It should be an associative array and
 * it should include a $dataset value corresponding to a database added with
 * $wpdb->add_database(). It may also include $server, which will be extracted
 * to overwrite the parameters of each randomly selected database server prior
 * to connection. This allows you to dynamically vary parameters such as the
 * host, user, password, database name, lag_threshold and TCP check timeout.
 */

/** Masters and slaves
 *
 * 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' => 1,
 *   'read'  => 1,
 * while a slave would be allowed only to read:
 *   'write' => 0,
 *   'read'  => 1,
 *
 * 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' => 1,
 *   'read'  => 0,
 * HyperDB tracks the tables that it has written since instantiation and sending 
 * subsequent read queries to the same server that received the write query. 
 * Thus a master set up this way will still receive read queries, but only 
 * subsequent to writes.
 */


/**
 * Network topology / Datacenter awareness
 *
 * 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. The read and write parameters can be used to place servers into
 * logical groups of more or less preferred connections. Lower numbers indicate
 * greater preference.
 *
 * This configuration instructs HyperDB to try reading from one of the local
 * slaves at random. If that slave is unreachable or refuses the connection,
 * the other slave will be tried, followed by the master, and finally the
 * remote slaves in random order.
 * Local slave 1:   'write' => 0, 'read' => 1,
 * Local slave 2:   'write' => 0, 'read' => 1,
 * Local master:    'write' => 1, 'read' => 2,
 * Remote slave 1:  'write' => 0, 'read' => 3,
 * Remote slave 2:  'write' => 0, 'read' => 3,
 *
 * In the other datacenter, the master would be remote. We would take that into
 * account while deciding where to send reads. Writes would always be sent to
 * the master, regardless of proximity.
 * Local slave 1:   'write' => 0, 'read' => 1,
 * Local slave 2:   'write' => 0, 'read' => 1,
 * Remote slave 1:  'write' => 0, 'read' => 2,
 * Remote slave 2:  'write' => 0, 'read' => 2,
 * Remote master:   'write' => 1, 'read' => 3,
 *
 * There are many ways to achieve different configurations in different
 * locations. You can deploy different config files. You can write code to
 * discover the web server's location, such as by inspecting $_SERVER or
 * php_uname(), and compute the read/write parameters accordingly. An example
 * appears later in this file using the legacy function add_db_server().
 */

/**
 * Slaves lag awareness 
 *
 * HyperDB accommodates slave lag by making decisions, based on the defined lag 
 * threshold. If the lag threshold is not set, it will ignore the slave lag.
 * Otherwise, it will try to find a non-lagged slave, before connecting to a lagged one.
 *
 * A slave is considered lagged, if it's replication lag is bigger than the lag threshold
 * you have defined in $wpdb->$default_lag_threshold or in the per-database settings, using 
 * add_database(). You can also rewrite the lag threshold, by returning 
 * $server['lag_threshold'] variable with the 'dataset' group callbacks.
 *
 * HyperDB does not check the lag on the slaves. You have to define two callbacks 
 * callbacks to do that:
 *
 * $wpdb->add_callback( $callback, 'get_lag_cache' );
 *
 * and
 *
 * $wpdb->add_callback( $callback, 'get_lag' );
 *
 * The first one is called, before connecting to a slave and should return
 * the replication lag in seconds or false, if unknown, based on $wpdb->lag_cache_key.
 *
 * The second callback is called after a connection to a slave is established. 
 * It should return it's replication lag or false, if unknown, 
 * based on the connection in $wpdb->dbhs[ $wpdb->dbhname ].
 */ 

/** Sample Configuration 1: Using the Default Server **/
/** NOTE: THIS IS ACTIVE BY DEFAULT. COMMENT IT OUT. **/

/**
 * This is the most basic way to add a server to HyperDB using only the
 * required parameters: host, user, password, name.
 * This adds the DB defined in wp-config.php as a read/write server for
 * the 'global' dataset. (Every table is in 'global' by default.)
 */
$wpdb->add_database(array(
	'host'     => DB_HOST,     // If port is other than 3306, use host:port.
	'user'     => DB_USER,
	'password' => DB_PASSWORD,
	'name'     => DB_NAME,
));

/**
 * 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.
 */
$wpdb->add_database(array(
	'host'     => DB_HOST,     // If port is other than 3306, use host:port.
	'user'     => DB_USER,
	'password' => DB_PASSWORD,
	'name'     => DB_NAME,
	'write'    => 0,
	'read'     => 1,
	'dataset'  => 'global',
	'timeout'  => 0.2,
));

/** Sample Configuration 2: Partitioning **/

/**
 * This example shows a setup where the multisite blog tables have been
 * separated from the global dataset.
 */
/*
$wpdb->add_database(array(
	'host'     => 'global.db.example.com',
	'user'     => 'globaluser',
	'password' => 'globalpassword',
	'name'     => 'globaldb',
));
$wpdb->add_database(array(
	'host'     => 'blog.db.example.com',
	'user'     => 'bloguser',
	'password' => 'blogpassword',
	'name'     => 'blogdb',
	'dataset'  => 'blog',
));
$wpdb->add_callback('my_db_callback');
function my_db_callback($query, $wpdb) {
	// Multisite blog tables are "{$base_prefix}{$blog_id}_*"
	if ( preg_match("/^{$wpdb->base_prefix}\d+_/i", $wpdb->table) )
		return 'blog';
}
*/


/** Sample helper functions from WordPress.com **/

/**
 * This is back-compatible with an older config style. It is for convenience.
 * lhost, part, and dc were removed from hyperdb because the read and write
 * parameters provide enough power to achieve the desired effects via config.
 *
 * @param string $dataset Datset: the name of the dataset. Just use "global" if you don't need horizontal partitioning.
 * @param int $part Partition: the vertical partition number (1, 2, 3, etc.). Use "0" if you don't need vertical partitioning.
 * @param string $dc Datacenter: where the database server is located. Airport codes are convenient. Use whatever.
 * @param int $read Read group: tries all servers in lowest number group before trying higher number group. Typical: 1 for slaves, 2 for master. This will cause reads to go to slaves unless all slaves are unreachable. Zero for no reads.
 * @param bool $write Write flag: is this server writable? Works the same as $read. Typical: 1 for master, 0 for slaves.
 * @param string $host Internet address: host:port of server on internet. 
 * @param string $lhost Local address: host:port of server for use when in same datacenter. Leave empty if no local address exists.
 * @param string $name Database name.
 * @param string $user Database user.
 * @param string $password Database password.
 */
/*
function add_db_server($dataset, $part, $dc, $read, $write, $host, $lhost, $name, $user, $password, $timeout = 0.2 ) {
	global $wpdb;

	// dc is not used in hyperdb. This produces the desired effect of
	// trying to connect to local servers before remote servers. Also
	// increases time allowed for TCP responsiveness check.
	if ( !empty($dc) && defined(DATACENTER) && $dc != DATACENTER ) {
		if ( $read )
			$read += 10000;
		if ( $write ) 
			$write += 10000;
		$timeout = 0.7;
	}

	// You'll need a hyperdb::add_callback() callback function to use partitioning.
	// $wpdb->add_callback( 'my_func' );
	if ( $part )
		$dataset = $dataset . '_' . $part;

	$database = compact('dataset', 'read', 'write', 'host', 'name', 'user', 'password', 'timeout');

	$wpdb->add_database($database);

	// lhost is not used in hyperdb. This configures hyperdb with an
	// additional server to represent the local hostname so it tries to
	// connect over the private interface before the public one.
	if ( !empty( $lhost ) ) {
		if ( $read )
			$database['read'] = $read - 0.5;
		if ( $write )
			$database['write'] = $write - 0.5;
		$wpdb->add_database( $database );
	}
}
*/

/**
 * Sample replication lag detection configuration.
 *
 * We use mk-heartbeat (http://www.maatkit.org/doc/mk-heartbeat.html) 
 * to detect replication lag.
 *
 * This implementation requires the database user 
 * to have read access to the heartbeat table.
 *
 * The cache uses shared memory for portability.
 * Can be modified to work with Memcached, APC and etc.
 */

/*
 
$wpdb->lag_cache_ttl = 30;
$wpdb->shmem_key = ftok( __FILE__, "Y" );
$wpdb->shmem_size = 128 * 1024;

$wpdb->add_callback( 'get_lag_cache', 'get_lag_cache' );
$wpdb->add_callback( 'get_lag',       'get_lag' );

function get_lag_cache( $wpdb ) {
	$segment = shm_attach( $wpdb->shmem_key, $wpdb->shmem_size, 0600 );
	$lag_data = @shm_get_var( $segment, 0 );
	shm_detach( $segment );

	if ( !is_array( $lag_data ) || !is_array( $lag_data[ $wpdb->lag_cache_key ] ) )
		return false;

	if ( $wpdb->lag_cache_ttl < time() - $lag_data[ $wpdb->lag_cache_key ][ 'timestamp' ] )
		return false;

	return $lag_data[ $wpdb->lag_cache_key ][ 'lag' ];
}

function get_lag( $wpdb ) {
	$dbh = $wpdb->dbhs[ $wpdb->dbhname ];

	if ( !mysql_select_db( 'heartbeat', $dbh ) )
		return false;

	$result = mysql_query( "SELECT UNIX_TIMESTAMP() - UNIX_TIMESTAMP(ts) AS lag FROM heartbeat LIMIT 1", $dbh );

	if ( !$result || false === $row = mysql_fetch_assoc( $result ) )
		return false;

	// Cache the result in shared memory with timestamp 
	$sem_id = sem_get( $wpdb->shmem_key, 1, 0600, 1 ) ;
	sem_acquire( $sem_id );
	$segment = shm_attach( $wpdb->shmem_key, $wpdb->shmem_size, 0600 );
	$lag_data = @shm_get_var( $segment, 0 );
	
	if ( !is_array( $lag_data ) )
		$lag_data = array();

	$lag_data[ $wpdb->lag_cache_key ] = array( 'timestamp' => time(), 'lag' => $row[ 'lag' ] );
	shm_put_var( $segment, 0, $lag_data );
	shm_detach( $segment );
	sem_release( $sem_id );

	return $row[ 'lag' ];
}

*/

// The ending PHP tag is omitted. This is actually safer than including it.

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