What does Windows error code 15815 (ERROR_STATE_COMPOSITE_SETTING_VALUE_SIZE_LIMIT_EXCEEDED) mean?

 
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ERROR_STATE_ENUMERATE_SETTINGS_FAILED ERROR_STATE_SETTING_VALUE_SIZE_LIMIT_EXCEEDED

ERROR_STATE_COMPOSITE_SETTING_VALUE_SIZE_LIMIT_EXCEEDED

The composite setting is too large

ERROR_STATE_COMPOSITE_SETTING_VALUE_SIZE_LIMIT_EXCEEDED is a validation failure: the complete serialized composite value is larger than the platform accepts. Retrying the same payload will not help.

Resolution options

  • Remove redundant fields and compact the representation.
  • Split independent data into several settings.
  • Store large documents or caches in application files or a database and keep only a reference in settings.
  • Avoid embedding binary blobs in configuration state.

Design note

Settings storage is intended for bounded configuration and state, not arbitrary content. Add size checks before calling the API so the application can provide a useful error and preserve the previous value.

Choosing another store

Large structured documents, histories, thumbnails, and caches belong in files or a database with explicit lifecycle management. The settings repository should retain only compact configuration and references.

Preventing regressions

Add a serialization-size unit test using worst-case strings and optional fields. Monitor actual payload sizes in development builds so growth is noticed before users reach the platform limit.

References


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