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Runtime Configuration

Runtime Configuration

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

mysqlnd_qc Configure Options
Name Default Changeable Changelog
mysqlnd_qc.enable_qc 1 PHP_INI_SYSTEM
mysqlnd_qc.ttl 30 PHP_INI_ALL
mysqlnd_qc.cache_by_default 0 PHP_INI_ALL
mysqlnd_qc.cache_no_table 0 PHP_INI_ALL
mysqlnd_qc.use_request_time 0 PHP_INI_ALL
mysqlnd_qc.time_statistics 1 PHP_INI_ALL
mysqlnd_qc.collect_statistics 0 PHP_INI_ALL
mysqlnd_qc.collect_query_trace 0 PHP_INI_SYSTEM
mysqlnd_qc.query_trace_bt_depth 3 PHP_INI_SYSTEM
mysqlnd_qc.slam_defense 0 PHP_INI_SYSTEM
mysqlnd_qc.slam_defense_ttl 30 PHP_INI_SYSTEM
mysqlnd_qc.collect_normalized_query_trace 0 PHP_INI_SYSTEM
mysqlnd_qc.std_data_copy 0 PHP_INI_SYSTEM
mysqlnd_qc.apc_prefix qc_ PHP_INI_ALL
mysqlnd_qc.memc_server PHP_INI_ALL
mysqlnd_qc.memc_port 11211 PHP_INI_ALL
mysqlnd_qc.sqlite_data_file :memory: PHP_INI_ALL

Here's a short explanation of the configuration directives.

mysqlnd_qc.enable_qc integer

Enables or disables the plugin. If disabled the extension will not plug into mysqlnd to proxy internal mysqlnd C API calls.

mysqlnd_qc.ttl integer

Default Time-to-Live (TTL) for cache entries in seconds.

mysqlnd_qc.cache_by_default integer

Cache all queries regardless if they begin with the SQL hint that enables caching of a query or not. Storage handler cannot overrule the setting. It is evaluated by the core of the plugin.

mysqlnd_qc.cache_no_table integer

Cache queries with no table name in any of columns meta data of their result set, e.g. SELECT SLEEP(1)?

mysqlnd_qc.use_request_time integer

Use PHP global request time to avoid gettimeofday() system calls? If using APC storage handler it should be set to the value of apc.use_request_time , if not warnings will be generated.

mysqlnd_qc.time_statistics integer

Collect run time and store time statistics using gettimeofday() system call? Data will be collected only if you also set mysqlnd_qc.collect_statistics = 1,

mysqlnd_qc.collect_statistics integer

Collect statistics for mysqlnd_qc_get_core_stats()()? Does not influence storage handler statistics! Handler statistics can be an integral part of the handler internal storage format. Thereofore, collection of some handler statistics cannot be disabled.

mysqlnd_qc.collect_query_trace integer

Collect query back traces?

mysqlnd_qc.query_trace_bt_depth integer

Maximum depth/level of a query code backtrace.

mysqlnd_qc.slam_defense integer

Activates handler based slam defense if available. Supported by Default and APC storage handler

mysqlnd_qc.slam_defense_ttl integer

TTL for stale cache entries which are served while another client updates the entries. Supported by APC storage handler.

mysqlnd_qc.collect_normalized_query_trace integer

Collect aggregated normalized query traces? The setting has no effect by default. You compile the extension using the define NORM_QUERY_TRACE_LOG to make use of the setting.

mysqlnd_qc.std_data_copy integer

Default storage handler: copy cached wire data? EXPERIMENTAL – use default setting!

mysqlnd_qc.apc_prefix string

The APC storage handler stores data in the APC user cache. The setting sets a prefix to be used for cache entries.

mysqlnd_qc.memc_server string

MEMCACHE storage handler: memcache server host.

mysqlnd_qc.memc_port integer

MEMCACHE storage handler: memcached server port.

mysqlnd_qc.sqlite_data_file string

sqlite storage handler: data file. Any setting but :memory: may be of little practical value.

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