Relational database management, Database Management System

Assignment Help:

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.


Related Discussions:- Relational database management

Design and implement a database system, Safe Banking is a Canberra based cr...

Safe Banking is a Canberra based credit union, which has several branches around Canberra and Queanbeyan. YOU have taken over Safe Banking. YOU need to create a database that organ

What are composite attributes, What are composite attributes? Composite...

What are composite attributes? Composite attributes can be separated in to sub parts.

multiple-mode locks, Multiple-mode locks : It offers two locks: exclusive ...

Multiple-mode locks : It offers two locks: exclusive locks and shared locks. But why do we require these two locks? There are a lot of transactions in the database system that neve

Descrine an data dictionary, Describe an data dictionary? A data dictio...

Describe an data dictionary? A data dictionary is a data structure which keeps meta data about the structure of the database ie. the schema of the database.

What creates while a primary key is combined with a foreign, What it create...

What it creates while a primary key is combined with a foreign key? It creates Parent-Child relation ship between the tables that connect them while a primary key is combined w

What purpose of tables, What is the purpose of tables, private synonyms and...

What is the purpose of tables, private synonyms and public synonyms? If there are multiple objects of similar name on an Oracle database, that order are they accessed in? The r

Describe file organisation, Describe file organisation? A file is organ...

Describe file organisation? A file is organized logically as a sequence of records. These records are mapped onto disk blocks. A) Fixed-Length Records Type deposit=record

Express types of information available in mysql, Express types of informati...

Express types of information available in MySQL? Information as regards the result of queries:  This includes number of records affected by any SELECT or UPDATE or DELETE st

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd