RDS is a Database as a Service (DBaaS) product. It can be used to provision a fully functional database without the admin overhead traditionally associated with DB platforms. It can perform at scale, be made publicly accessible, and can be configured for demanding availability and durability scenarios.
Relational database management systems (RDBMS) are used when the data to be managed has formal and fixed relationships. Data is stored on disk as “rows,” and entire rows must be parsed even if individual attributes are all that’s needed. Reading one attribute from 10,000 records requires 10,000 rows to be read from the disk.
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