SPSite.Cache Property

A thread-safe cache that may be used to store very small amounts of data associated with this SPSite.

Namespace:  Microsoft.SharePoint
Assembly:  Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: No
Available in SharePoint Online

public SPSiteCollectionPropertyCache Cache { get; }

The cache is stored in memory and will be emptied at the next process recycle. Cache entries may be removed during site deletion, but invalidation is not assured. A process recycle may be required to invalidate cached entries. Because the cache has no flush mechanism it is critical that only very small values are placed in the cache.