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Ubiquitous Dbms Reading

In: Computers and Technology

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DBMS is a high-level query language because it is used for real work data stored in relational data model, it evaluate queries very efficiently. In this way, users can manage large amount of structured data by DBMS. Users don’t have to write low level language to realize some specific functions, don’t need to debug or testing the application functions, therefore DBMS reduces development time.In DBMS, the data model, which is called schema, for example relational, we can have entities and attributes, indexing and statistics and so on. We can think DBMS is working as a data dictionary because it is a relation that has all the relations and all the relations has all the attributes. DBMS has an efficient way to store and retrieve related data.

There are many ways to compute the query, however, there must be a best way to do it. DBMS has unique techniques to read and return data users need. The insert, delete and modify operations of DBMS is very convenient for users to use. DBMS can help to find the best way to minimize the cost of computing. That’s why DBMS is considered query optimizing.DBMS is integrity constraints because it defines rules to describe the how data stored in the database system. If there is some data that does not obey the rule, it is not belong tothis database. Each set of data item is independent (there is a primary key for each item), and the relations are dependent.When there are multiple users using the same database, they are interrupting the execution of one query to each other if there is no way to solve it. DBMS solves the problem by making transactions one at a time. We can think DBMS is working for one user at one time. By this way, even if there are many users doing some operations to the same database, they will not interleave to each other.DBMS takes care of the situation when the database operation or system fail, users can continue to access it in a consistent state without any loss of data. This is called DBMS recovery.

References

1 Whang, K., Song, I., Kim, T., and Lee, K. 2010. The Ubiquitous DBMS. SIGMOD Rec. 38, 4(Jn. 2010), 14-22.
2 “Features of SQLite”, www.sqlit.org/features.html

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