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For this application, we will consider IBM DB2 catalog data (i.e., metadata) for IBM's enterprise-class servers running the z/OS (formerly OS/390 or MVS) operating system. One of the outcomes of this question is to give you some experience in actually exploring the contents of what's in an RDBMS catalog. This will also give us a head start in thinking about query optimization-a major part of this course.
Go to this Web site:
SYSIBM.SYSCOLUMNS
SYSIBM.SYSCOPY
SYSIBM.SYSDATABASE
SYSIBM.SYSDBRM
SYSIBM.SYSINDEXES
SYSIBM.SYSINDEXPART
SYSIBM.SYSPLAN
SYSIBM.SYSTABLEPART
SYSIBM.SYSTABLES
SYSIBM.SYSTABLESPACE
SYSIBM.SYSTABLESPACESTATS
In this course, we will frequently encounter a program that is a crucial component of an RDBMS. That program is called an optimizer. It tries to determine the optimal access path when accessing (e.g., retrieving) data in a database. An optimizer obtains statistics or metadata (i.e., data about data) from a data repository in the DBMS called a catalog. The catalog will have information about the columns of tables and indices; the number of rows in a table; the numbers, types, and (possibly) distribution of values for columns in the tables; and literally hundreds of other pieces of information.
a project based on normalization with first, second and third normalization. There need to be a diagram also
Explain the Cascadeless Schedule A cascadeless schedule is one in which for every pair of transactions Ti and Tj like that Tj reads a data item before written by Ti, the commit
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Describe association design of an object by giving one suitable example of it. The Design of Associations Associations are "glue" of advanced object oriented analysis and
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
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what is attribute is attribute inheritance in dbms?
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Increased overheads on update : On the drawbacks side, it will need the system to ensure that all replicas of a relation are consistent. This shows that all the replicas of the rel
Example- Search the salary of employees who are not 'ANALYST' but get a salary below than or equal to any people employed as 'ANALYST'. SELECT EMPNO, ENAME, JOB, SAL FROMEMP
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