Key Value Storage Systems Key-value stores may store uninterpreted bytes,with an associated key E.g.,Amazon S3,Amazon Dynamo Wide-table(can have arbitrarily many attribute names)with associated key Google BigTable,Apache Cassandra,Apache Hbase, Amazon DynamoDB Allows some operations(e.g.,filtering)to execute on storage node ·JSON MongoDB,CouchDB(document model) Document stores store semi-structured data,typically JSON Some key-value stores support multiple versions of data,with timestamps/version numbers Database System Concepts-7th Edition 10.11 ©Silberscha乜，Korth and SudarshanDatabase System Concepts - 7 10.11 ©Silberschatz, Korth and Sudarshan th Edition Key Value Storage Systems ▪ Key-value stores may store • uninterpreted bytes, with an associated key ▪ E.g., Amazon S3, Amazon Dynamo • Wide-table (can have arbitrarily many attribute names) with associated key • Google BigTable, Apache Cassandra, Apache Hbase, Amazon DynamoDB • Allows some operations (e.g., filtering) to execute on storage node • JSON ▪ MongoDB, CouchDB (document model) ▪ Document stores store semi-structured data, typically JSON ▪ Some key-value stores support multiple versions of data, with timestamps/version numbers