System Engineer

It is a process of analyzing the given relation schemas based on their functional dependencies and primary keys to achieve the following desirable properties: 
1. Minimizing the Insertion, Deletion, And Update Anomalies Relation schemas that do not meet the properties are decomposed into smaller relation schemas that could meet desirable properties. 
2. Minimizing Redundancy

Following are some details of three :
DDL stands for Data Definition Language. SQL queries like CREATE, ALTER, DROP, TRUNCATE and RENAME come under this. 
DML stands for Data Manipulation Language. SQL queries like SELECT, INSERT, DELETE and UPDATE come under this. 
DCL stands for Data Control Language. SQL queries like GRANT and REVOKE come under this.

Batched operating systems
Distributed operating systems
Timesharing operating systems
Multi-programmed operating systems
Real-time operating systems