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-Self-describing nature of a database system: A DBMS catalog stores the description of the database. The description is called meta-data). This allows the DBMS software to work with different databases.
-Insulation between programs and data: Called program-data independence. Allows changing data storage structures and operations without having to change the DBMS access programs.
-Data Abstraction: A data model is used to hide storage details and present the users with a conceptual view of the database.
-Support of multiple views of the data: Each user may see a different view of the database, which describes only the data of interest to that user.
-Sharing of data and multi-user transaction processing : allowing a set of concurrent users to retrieve and to update the database. Concurrency control within the DBMS guarantees that each transaction is correctly executed or completely aborted.Online Transaction Processing is a major part of database applications.
jim items answered the question on March 9, 2019 at 07:44
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#include
int *p, x;
int a[5]={100,200,300,400,500};
int *p2;
int main()
{
p=NULL;
x=500;
p=&x;
printf("1) %d %d \n",x,*p,p,&x,&p);
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*(p2+1)=*p;
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return 0;
}
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