TTL's and Expiry Notification
Couchbase includes a TTL (Time To Live) as part of the meta data fields for each document. All of the client SDK's includes support for setting/querying/touching this value. The value is set as the "number of seconds a document should live" for documents that are to expire in 30 days or less. For values longer than 30 days a unix epoch time value must be passed. TTL's are often used in high performance session stores and caching applications.
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