ArkData Glossary Write Ahead Log (WAL) WAL is a SQLite log mode, which is different from the traditional rollback journal mode. It is used to improve the concurrency performance and write efficiency.
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openharmony 鸿蒙 uniform-data-type-descriptors-c
UTDs (C/C++) When to Use The Unified Data Management Framework (UDMF) provides standards for data interaction across applications and devices, defines a unified data language, and improves data intera
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openharmony 鸿蒙 share-data-by-silent-access-sys
Silent Access via DatamgrService (ArkTS) (for System Applications Only) When to Use In a typical cross-application data access scenario, the data provider may be started multiple times. To minimize th
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openharmony 鸿蒙 device-usage-statistics-overview-sys
Device Usage Statistics Overview (for System Applications Only) Device usage statistics include the usage of applications, notifications, and the system. In application usage statistics, you can query
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openharmony 鸿蒙 device-usage-statistics-use-guide-sys
Device Usage Statistics Development (for System Applications Only) When to Use Device usage statistics include the usage of applications, notifications, and the system. For example, you can use the AP
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openharmony 鸿蒙 inputmonitor-guidelines-sys
Input Monitor Development (for System Applications Only) When to Use The inputMonitor module provides capabilities such as listening for key events and touchpad gestures. For example, if your applicat
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openharmony 鸿蒙 inputeventclient-guidelines-sys
Event Injection Development (for System Applications Only) When to Use The inputEventClient module enables an application to listen for injected input events, such as mouse click events and combinatio
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openharmony 鸿蒙 shortkey-guidelines-sys
Preset Global Hotkey Development (for System Applications Only) When to Use You can use the preset global hotkeys to set the delay time for starting an ability. An example is to take a screenshot 5 se
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openharmony 鸿蒙 inputconsumer-guidelines-sys
Global Hotkey Development (for System Applications Only) When to Use The inputConsumer module implements global hotkey management, such as subscribing to global hotkeys and setting the key shielding s
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openharmony 鸿蒙 keypressed-guidelines
Preferential Response of System Function Keys When to Use Each system function key has a default function, which is fixedly implemented by the system. For example, the volume keys are used to adjust t
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