Data Management On Non Volatile Memory From Mobile Applications To Large Scale Databases
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Data Management on Non-volatile Memory: from Mobile Applications to Large-scale Databases
The non-volatile memory technique advanced rapidly in recent years. First, mature NAND flash memory is getting cheaper and denser. It has impacted our daily life. Second, emerging persistent memory technologies such as 3d XPoint have demonstrated great potentials in revolutionizing modern memory hierarchy. In this research, we first carry out a project on the mature NAND-flash-based solid state drives. We propose a new RAID5 technique called CR5M to enhance data reliability within a single SSD for safety-critical mobile applications. We also proposed an associated data reconstruction strategy called MCR to further shrink the window of vulnerability. Compared with traditional RAID5, CR5M can achieve up to 40.2% performance improvement. The data recovery speed is also improved by 7.5%. Because persistent memory is byte-addressable and has near-DRAM access speed, it exhibits a huge potential to build a hybrid memory system where both DRAM and PM are directly connected to a CPU. We designed a concurrent hash-assisted radix tree for DRAM-PM Hybrid Memory Systems. In such a system, an efficient indexing data structure such as a persistent tree becomes an indispensable component. Designing a capable persistent tree, however, is challenging as it has to ensure consistency, persistence, and scalability without substantially degrading performance. We propose a novel concurrent and persistent tree called HART (Hash-assisted ART), which employs a hash table to manage ARTs. HART not only optimize its performance but also prevent persistent memory leaks. In most cases, HART significantly outperforms WOART and FPTree, two state-of-the-art persistent trees. Also, it scales well in concurrent scenarios. Then, we proposed multi-hashing, a dual-level hash table indexing for a highperformance, large-capacity, and low-cost in-memory database. Multi-hashing is also built on a DRAM-PM hybrid memory system. On the DRAM level, an indexing structure is designed to be memory-efficient to manage hot indexes. On the PM level, another indexing data structure is designed to be performance-optimized. The indexes in DRAM will be merged into PM periodically. Our experimental results show that multi-hashing shows better performance under Sparse workloads when compared with HART. It also consumes less memory under both Dense and Sparse workloads.
35 IBPS RRB Officer Scale 1 & Office Assistant Prelim & Main Previous Year-wise Solved Papers (2013 - 2023) 5th Edition
The updated 5th edition of the book “35 IBPS RRB Officer Scale 1 & Office Assistant Prelim & Main Year-wise Solved Papers (2013-23)”. # This book contains 35 previous year Solved Papers from 2013 to 2023 of Preliminary and Main exams of the Officer Scale 1 & Office Assistant Exams. # Each Paper covers Reasoning Ability, Quantitative Aptitude, English Language, Computer Awareness and General Awareness. # Out of 35 Solved Papers - 18 Solved Papers (2013 - 2023) of IBPS RRB Officer Scale 1 and 17 Solved Papers (2015 - 2023) of IBPS RRB Office Assistant (Multipurpose) exams are provided. # The solutions provided in the book are very well explained, easy to understand and detailed. # The book is useful for students who are appearing for IBPS RRB Office Assistant (Multipurpose) and IBPS RRB Officer Scale 1 Exams. # The strength of the book lies in the originality of its question papers and Errorless Solutions. # The solution of each and every question is provided in detail (step-by-step) so as to provide 100% concept clarity to the students.
39 IBPS RRB Officer Scale 1 & Office Assistant Prelim & Main Previous Year-wise Solved Papers (2013 - 2024) 6th Edition
The updated 6th edition of the book 39 IBPS RRB Officer Scale 1 & Office Assistant Prelim & Main Year-wise Solved Papers (2013 - 24). # This book contains 39 previous year Solved Papers from 2013 to 2024 of Preliminary and Main exams of the Officer Scale 1 & Office Assistant Exams. # Each Paper covers Reasoning Ability, Quantitative Aptitude, English Language, Computer Awareness and General Awareness. # Out of 39 Solved Papers - 20 Solved Papers (2013 - 2024) of IBPS RRB Officer Scale 1 and 19 Solved Papers (2015 - 2024) of IBPS RRB Office Assistant (Multipurpose) exams are provided. # The solutions provided in the book are very well explained, easy to understand and detailed. # The book is useful for students who are appearing for IBPS RRB Office Assistant (Multipurpose) and IBPS RRB Officer Scale 1 Exams. # The strength of the book lies in the originality of its question papers and Errorless Solutions. # The solution of each and every question is provided in detail (step-by-step) so as to provide 100% concept clarity to the students.