Difference between revisions of "NoSQL"

Revision as of 18:22, 17 November 2013

Interface: extremely simple
1. Data model: (key, value) pairs
2. Operations: Insert(key, value), Fetch(key), Update(key), Delete(key)
3. Some allow (non-uniform) columns within value.
4. Some allow Fetch on range of keys.

Implementation: efficiency, scalability, fault-tolerance
- Records distributed to nodes based on key
- Replication
- Single-record transactions, "eventual consistency".

Interface
- Data model: (key, document) pairs
- document: JSON, XML, other semistructured formats.
- Basic operations: Insert(key, value), Fetch(key), Update(key), Delete(key)
- Also Fetch based on document contents (very system/format specific as of Nov 2011)

Interface
- Data model: nodes and edges
- Nodes may have properties (including ID)
- Edges may have labels or roles

@@ Line 11: / Line 11: @@
 ** Replication
 ** Single-record transactions, "eventual consistency".
+* Example Systems (as of Nov 2011)
+** Google BigTable
+** Amazon Dynamo,
+** Cassandra
+** Voldemort
+** HBase
+=== Document Stores ===
+* Interface
+** Data model: (key, ''document'') pairs
+** ''document'': JSON, XML, other semistructured formats.
+** Basic operations: '''Insert'''(key, value), '''Fetch'''(key), '''Update'''(key), '''Delete'''(key)
+** Also '''Fetch''' based on document contents (very system/format specific as of Nov 2011)
+* Example Systems (as of Nov 2011)
+** CouchDB
+** MongoDB
+** SimpleDB
+=== Graph Database Systems ===
+* Interface
+** Data model: '''nodes''' and '''edges'''
+** Nodes may have '''properties''' (including '''ID''')
+** Edges may have '''labels''' or '''roles'''
+* Example Systems (as of Nov 2011)
+**
+**
+**
+**