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\section{Load on the Database}  The choice of the datastructures and the design of the individual components of a database system depends a lot on the load on the database. In addition to the raw \textbf{Input Output Operations Having the estimated \textbf{Queries  Per Second (IOPS)} estimate, we also need to know the ratio of (QPS)} numbers for average and peak load on  the type of database can help in choosing  the I/O requests (\textbf{read or write}). design aspects.  If the database will spend more than 99\% of the time on writes (say a logging application), then a Log Structured Merge Tree \cite{O_Neil_1996} may be effective; conversely, if 99\% of the time will be on reads, then memory maps may prove to be more efficient. So, understanding the application need is very important while designing a distributed database. Even while choosing an existing database, having knowledge about the nature of the database workload by the application(s) on top will be useful.