- Goals of
the design of
key-value database systems:
- High performance (fast access to data)
- Availability (almost always operational)
- Scalability (accommodate large user population)
- Data model in
key-value databases:
- A key-value database
will only store
data in
the following format:
- Key:
- Key = a unique identifier associated with the data
- Used to locate the data item
- Value:
- Value = the data item itself
Example of values:
- Movies
- Images
- Text files
(such as JSON/XML documents)
- Any string of bytes !!!
- A key-value database
will only store
data in
the following format:
- That means:
- The format of the
data that is
stored in a
key-value database
must have the
structure:
(You can see that the format is different from the tradition table format of SQL databases)
- The key is used as a search index (e.g., a B+-tree) to allow fast access of the corresponding data through the index
- The format of the
data that is
stored in a
key-value database
must have the
structure: