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問題一覧
1
data storage, retrieval and update
function
2
a user-accessible catalogue or data dictionary
function
3
transaction support
function
4
concurrency control services
function
5
recovery services
function
6
authorization services
function
7
support for data communication and networking
function
8
control redundancy
advantages
9
integrity can be enforced
advantages
10
inconsistency can be avoided
advantages
11
data can be shared
advantages
12
standards can be enforced
advantages
13
restricts unauthorized access
advantages
14
solves enterprise requirements
advantages
15
provides back up and recovery
advantages
16
cost of developing and maintaining a system lower
advantages
17
data model can be developed
advantages
18
concurrency control
advantages
19
complexity
disadvantages
20
size
disadvantages
21
performance
disadvantages
22
higher impact of failure
disadvantages
23
cost of DBMS
disadvantages
24
additional hardware costs
disadvantages
25
cost of convention
disadvantages
26
qualified personnel
disadvantages
27
classification of database distribution
centralised database, distributive database
28
stored in a single site that is used by several systems
centralised database
29
distributed from various sites that are connected by a computer network
distributive database
30
classifications of database based on type of data
single user database , multi-user database
31
allows only one connection to database at given moment in time
single user database
32
provides simultaneous access for multiple users
multi-user database
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