1 Around 10% of men is affected by pearly penile papules.  After masturbation or sexual intercourse hard swelling might appear near the foreskin, in the shaft of the head of the penis. This swelling is called lymphocele, and is caused by temporary blockage of the lymphatic channels at the area described.
A key-value store, or key-value database, is a data storage paradigm designed for storing, retrieving, and managing associative arrays, a data structure more commonly known today as a dictionary or hash. Dictionaries contain a collection of objects, or records, which in turn have many different fields within them, each containing data.
Key-Value Databases. The simplest type of NoSQL database is the key-value stores. These databases store data in a completely schema-less way, meaning that no defined structure governs what is being stored. A key can point to any type of data, from an object, to a string value, to a programming language function. The advantage of key-value stores is that they are easy to implement and add data to.