Zend Data Cache - Configuration Directives
This topic lists all the configuration directives for Zend Data Cache.
Configuration Directives Summary
The table below is a summary of all the Zend Data Cache configuration directives, and displays the directive name, its default value, and a description:
|
Directive |
Default Value |
Description |
|
1 |
Enable statistics collection |
|
|
32 / 2 |
Amount of shared memory to be used by a single namespace (in MB per namespace). |
|
|
0 |
Amount of shared memory to be used by a single namespace (in KB per namespace). |
|
|
100 |
When the miss cost cannot be evaluated, use this value for statistics purposes |
|
|
0 |
Maximum number of namespaces that Data Cache will allocate. |
|
|
0 |
Set the default life time of a cache entry (seconds). Value of 0 means infinite |
|
|
datacache |
The path for storing cached content to the disk |
|
|
2 |
Directory depth for storing keys. |
|
|
1 |
Enables the Data Cache. The Data Cache cannot work without this directive. The Data Cache can be turned on or off from the User Interface |
|
|
1 |
Enables the lock on expire mechanism. This is ON by default and should stay that way for performance reasons. |
|
|
2 |
The log verbosity level [0-5]. |
|
|
10 |
The maximum size of the log file before it is rotated. |
Configuration Directives Details
The list below contains information for all the available configuration directives for Zend Data Cache: their description, type, units, default value, modification scope, and the Zend Server version they became available in.
zend_datacache.enable_statistics
Enable statistics collection
Default Value: 1
Type: boolean
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 9.2
zend_datacache.shm.memory_cache_size
Amount of shared memory to be used by a single namespace, in Megabytes per namespace
Default Value:
- Windows, Linux: 32
Units: MBytes
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 4.0
zend_datacache.shm.memory_cache_size_kb
Amount of shared memory to be used by a single namespace in Kilobytes per namespace. When set to 0, the amount of memory to use is taken from the directive 'memory_cache_size'.
Default Value: 0
Units: KBytes
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 5.5
zend_datacache.default_miss_cost
When the miss cost cannot be evaluated, use this value for statistics purposes
Default Value: 100
Units: milliseconds
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 9.2
zend_datacache.shm.max_num_namespaces
Maximum number of namespaces that Data Cache will allocate. If set to 0, there is no limit.
Default Value: 0
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 5.5
zend_datacache.default_ttl
Set the default life time of a cache entry (seconds). Value of 0 means infinite
Default Value: 0
Type: int
Modification Scope: ZEND_INI_ALL
Available Since Version: 9.2
zend_datacache.disk.save_path
The path for storing cached content to the disk
Default Value: datacache
Type: string
Modification Scope: ZEND_INI_ALL
Available Since Version: 4.0
zend_datacache.disk.dir_level
Directory depth for storing keys.
Default Value: 2
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 4.0
zend_datacache.enable
Enables the Data Cache. The Data Cache cannot work without this directive. The Data Cache can be turned on or off from the User Interface
Default Value: 1
Type: boolean
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 4.0
zend_datacache.lock_on_expire
When setting this directive to 1 (i.e. ON), Data Cache will extend the time-to-live of an expired item until a replacement is provided. The first process that attempts to fetch an expired item will receive FALSE, while other processes will keep on receiving the expired item - it is up to the caller to provide a new and updated item.
Default Value: 1
Type: boolean
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 4.0
zend_datacache.log_verbosity_level
The extension's log verbosity level. Level 1 includes very important information messages, errors and warnings. Level 2 displays notices. Greater levels (up to 5) are reserved for debug purposes.
Default Value: 2
Type: int
Modification Scope: ZEND_INI_SYSTEM
Available Since Version: 4.0
zend_datacache.log_rotation_size
The maximum size of the log file before it is rotated.
Default Value: 10
Units: MBytes
Type: int
Modification Scope: ZEND_INI_ALL
Available Since Version: 4.0