Bigtable is a distributed storage solution developed at Google for storing structured data in a scalable manner. Multiple products(At the time the paper was written)…
Paper Notes: Amazon DynamoDB – A Scalable, Predictably Performant, and Fully Managed NoSQL Database Service
Sometime back, I wrote a post on Dynamo which is Amazon’s key-value store. This paper is not about that. This paper was presented at a…
Paper Notes: WiscKey – Separating Keys from Values in SSD-conscious Storage
During the last post about LSM trees, we discussed how awesome they are for write-heavy storage engines. But we also got a glimpse into why…
LSM Tree: Data structure powering write heavy storage engines
A database system is built by gluing together multiple pieces of technology. One such piece is a storage engine which is responsible for providing an…
Paper Notes: Cassandra- A Decentralized Structured Storage System
Cassandra is a distributed storage system that focusses on providing a highly scalable & available service for storing very large amount of data. As part…
Transactions: Serializable Snapshot Isolation
Working with various isolation levels, we have seen a compromise being done between getting things correct and getting things fast. It feels like being stuck…
Transactions: Two-phase Locking
Two-phase locking(2PL for short) is one of the most well-known algorithm for serializability. Note that it is totally different concept from two-phase commit even though…
Transactions: Introduction to serializability techniques
So far we have seen various problems that arise with concurrent transactions and how different approaches try to tackle them(and sometimes fail). The major issue with…
Transactions: Write skew & why we need serialization?
Up until now we have seen various problems that can arise due to concurrent request for both read as well as write access of a…
Transactions: Tackling lost updates
As part of read committed isolation and snapshot isolation, we primarily focussed on tactics to ensure correctness of reads in a concurrent transactional system. But…