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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.
Define the categories of SQL Statements? 1) Statements that don't return a result set. This statement class includes INSERT, DELETE, and UPDATE. 2)Statements that return
Differentiate between Key and superkey? Key and superkey - A key a single attribute or a combination of two or more attributes of an entity set in which is used to identify o
data models are being replaced over years. Reasons and why does that happen?
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
What is deadlock? How can it be avoided? How can it be resolved once it occurs? Deadlock happens when two transactions are each waiting on a resource that the other transaction
Evaluate: a.When transactions T1 and T2 are in a deadlock, one of the transactions will eventually implement to completion and let the other one continue implementation. b.
Define tuple variable Tuple variable is a type of variable whose domain is the set of all tuples.
Consider the subsequent relations along with keys underlined Street (name, location, city) House (number, street_name) Lives (name, house_number) Define the above relations
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
What is a homogeneous distributed database? In homogeneous distributed databases, all sites have the same database management system software, are aware of one another, and agr
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