Database 1 Definitions
Database, can be simply interpreted as: efficient storage and processing of data media (mainly divided into two types of disk and memory).
2 classification
Depending on the database storage medium, it can be divided into two categories: relational database (SQL) and non-relational database (Nosql,not only SQL).
3 examples
Relational database:
- Large: Oracle, DB2, etc.;
- Medium: SQL Server, MySQL, etc.;
- Small: Access, and so on.
Non-relational database:
- Memcached, MongoDB, and Redis.
4 differences
Relational database:
- Security, which saves the data to the disk, the basic impossibility of the loss of data;
- Space is wasted because it stores data in a two-dimensional table.
Non-relational database:
- High efficiency of storing data;
- is not particularly secure, and sudden power outages can result in data loss.
--Reprinted from CSDN
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