Installation
Persistent Connections
Mysqlnd
PHP Manual

## Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

MySQL Native Driver Configuration Options
Name | Default | Changeable | Changelog
--- | --- | --- | ---
mysqlnd.collect_statistics | "1" | PHP_INI_SYSTEM | Available since PHP 5.3.0.
mysqlnd.collect_memory_statistics | "0" | PHP_INI_SYSTEM | Available since PHP 5.3.0.

For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

`mysqlnd.collect_statistics` boolean

  Enables the collection of various client statistics which can be accessed through mysqli_get_client_stats(), mysqli_get_connection_stats(), mysqli_get_cache_stats() and are shown in mysqlnd section of the output of the phpinfo() function as well.

  This configuration setting enables all MySQL Native Driver statistics except those relating to memory management.

`mysqlnd.collect_memory_statistics` boolean

  Enable the collection of various memory statistics which can be accessed through mysqli_get_client_stats(), mysqli_get_connection_stats(), mysqli_get_cache_stats() and are shown in mysqlnd section of the output of the phpinfo() function as well.

  This configuration setting enables the memory management statistics within the overall set of MySQL Native Driver statistics.

Installation
Persistent Connections
Mysqlnd
PHP Manual