Full backup is a full copy of your entire data set. They are time-consuming and often require a lot of disk space. Differential backups only backup up the data that has changed since the last full backup. If you have a full backup on Sunday and differential backup every week day nights, you only need... » read more
Indexes are used to speed-up query processes in a database. They are similar to an index for a book. If you need to go to a particular chapter you can go to the index, find the page number of the chapter and go directly to the page. Database index works the same way. If you... » read more
Transactional Database Analytical Database OLTP OLAP Operational Systems Data Warehousing Original source of data Data comes from varies sources Large number of transactions. Low number of transaction. Very fast query processing Queries are often very complex and involve aggregations Detailed and current data, and schema is the entity model (usually 3NF) Aggregated, historical data, stored... » read more