vinayak saokar

hat are explicit… system’s storage management must not treat SSDs and HDDs as slightly slower, persistent RAM, since random writes to an SSD are roughly an order of magnitude slower than sequential writes. Random reads, on the other hand, can be performed without any performance penalties. There are some database systems (e.g. Oracle Exadata, Aerospike) that are explicitly engineered for…

on asynchronously. The great advantage of eager replication is consistency among replicas, but it c…ed to replicas and where updates are accepted. There are two possible choices on tier one (“when”): Eager(synchronous) replication propagates incoming changes synchronously to all replicas before a commit can be returned to the client, whereas lazy (asynchronous) replication applies changes only at the receiving replica and passes them on asynchronously. The great advantage of eager replication is consistency among replicas, but it comes at the cost of…

…and and again be removed when dispensable. For increased flexibility, elastic systems typically use consistent hashing where records are not directly assigned to servers, but instead to logical partitions which are then distributed across all shard servers. Thus, only a fraction of the data have to be reassigned upon changes in the system topology. For e…