DeeDS towards a distributed and active real-time database system

Virtual Full Replication for Scalable and Adaptive Real-Time Communication in Wireless Sensor Networks

“…To improve predictability, the distributed real-time database system prototype DeeDS [2] stores its database entirely in main memory, avoiding disk I/O delays caused by unpredictable access times for hard drives. To avoid transaction delays due to unpredictable network delays, the database is virtually fully replicated to all nodes, such that there are always local database object replicas for transactions that execute.…”

“…The concept of Virtual Full Replication (ViFuR) [2,12] has been introduced in DeeDS to ensure that all used data objects are available at the local node, and to reduce the resource usage compared to full replication. ViFuR has the advantages of full replication, such as transaction timeliness, simplified addressing of communication, built-in storage and data aggregation, and support for fault tolerance and partitioning.…”

Virtual Full Replication by Adaptive Segmentation

“…To improve predictability, the distributed real-time database system DeeDS [1] stores its database entirely in main memory, to avoid disk I/O delays caused by unpredictable access times for hard drives. Also, accesses to main memory are many times faster.…”

On Analytical Performance Measurement of Concurrency Control Protocols in DBMS

“…Update value of some uncommitted transaction may be read by another transaction that commit earlier and the first transaction rollbacks; and while processing some queries, some other transaction may update the desired records partially [1], [6] concurrently handle those situations in multiprocessing and multitasking environments. One of the fundamental properties of transaction is the isolation [1].…”