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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.
Describe the types of attributes? Types of attributes: An attribute's category determines the type of values that are permitted in the attribute. For instance, the value vers
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
1. Which relational algebra operations do not need the participating tables to be union-compatible? Ans: Join is the relational algebra operations that do not need the particip
A database is to be constructed to remain track of the teams and games of a sport league. A team has a number of players, not all of whom participate in every game. It is desired
Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing e
System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
PART MARKING: We will only mark TWO of the four questions below but you must submit answers to all four. We will choose the questions we mark randomly and we will supply you with
Can we delete data element, which is being used by table fields. No we cant delete data element.
What are multiple inheritances? Multiple inheritances allow a class to inherit variables and methods from many super classes.
Explain data abstraction? Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is
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