Sameh Mohamed Elnikety

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Clock-SI is a fully distributed protocol that implements snapshot isolation (SI) for partitioned data stores. It derives snapshot and commit timestamps from loosely synchronized clocks, rather than from a centralized timestamp authority as used in current ...

In stand-alone databases, the functions of ordering the transaction commits and making the effects of transactions durable are performed in one single action, namely the writing of the commit record to disk. For efficiency many of these writes are grouped ...

This thesis demonstrates that, despite earlier projections to the contrary, database replication on a cluster of low-cost commodity servers can transparently scale database performance. In a replicated system providing the standard transactional properties ...

Large commercial latency-sensitive services, such as web search, run on dedicated clusters provisioned for peak load to ensure responsiveness and tolerate data center outages. As a result, the average load is far lower than the peak load used for provision ...

Generalized snapshot isolation extends snapshot isolation as used in Oracle and other databases in a manner suitable for replicated databases. While (conventional) snapshot isolation requires that transactions observe the “latest” snapshot of the database, ...

We propose two protocols that provide scalable causal consistency for both partitioned and replicated data stores using dependency matrices (DM) and physical clocks. The DM protocol supports basic read and update operations and uses two-dimensional depende ...

This paper develops analytical models to predict the throughput and the response time of a replicated database using measurements of the workload on a standalone database. These models allow workload scalability to be estimated before the replicated system ...

BEST PAPER AWARDWe present a memory-aware load balancing (MALB) technique to dispatch transactions to replicas in a replicated database. Our MALB algorithm exploits knowledge of the working sets of transactions to ...

Sameh Mohamed Elnikety

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Clock-SI: Snapshot Isolation for Partitioned Data Stores Using Loosely Synchronized Clocks

Tashkent: Uniting Durability with Transaction Ordering for High-Performance Scalable Database Replication

Transparent scalable database replication

PerfIso: Performance Isolation for Commercial Latency-Sensitive Services

Database Replication Using Generalized Snapshot Isolation

PerfIso: Performance Isolation for Commercial Latency-Sensitive Services

Orbe: Scalable Causal Consistency Using Dependency Matrices and Physical Clocks

Predicting Replicated Database Scalability from Standalone Database Profiling

Tashkent+: Memory-Aware Load Balancing and Update Filtering in Replicated Databases

Clock-RSM: Low-Latency Inter-Datacenter State Machine Replication Using Loosely Synchronized Physical Clocks