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Design and Implementation of Data Dictionary in Da Meng DBMS

Author: ZhangYuan
Tutor: ZhouYingZuo
School: Huazhong University of Science and Technology
Course: Computer software set theory
Keywords: Database Data Dictionary Cache Concurrency Control
CLC: TP311.13
Type: Master's thesis
Year: 2011
Downloads: 22
Quote: 0
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Abstract


The data dictionary is an important part of the database management system . Data dictionary record database metadata information , it does not save the database data , but to save the information to manage the actual data . Any good database management system , it must also contain the data dictionary information . Database administrators and database users through the data dictionary can easily access to any database table or column , without the need to access the actual database data . If there is no data dictionary information , database management system will not be able to access the database data . Therefore , the data dictionary is particularly important . The database is running , the database you want to check the state of user access rights and database objects , frequently access the data dictionary . Change the structure of the database , the database management system auditing and permissions information , you have to update the data dictionary information . Therefore , the data dictionary information stored in the cache , and the design of a second-level cache model , in order to ensure that the database and efficient access to the data dictionary information . In a multi - user environment , to ensure that each database user access to the right data is a severe test . Concurrency control is a key part of the management of data dictionary shared cache . In-depth study of the data dictionary cache concurrency control and design a set of lock - based concurrency control mechanism to improve the degree of concurrency .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer software > Program design,software engineering > Programming > Database theory and systems
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