m_09_1.00 managing schema objects with demos and labs 2012.pdf

7/27/2019 M_09_1.00 Managing Schema Objects with Demos and Labs 2012.pdf

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Module 9: ManagingSchema Objects


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Overview

Naming guidelines for identifiers in schema objectdefinitions

Storage and structure of schema objects

Implementing data integrity using constraints

Implementing business rules at the database level usingtriggers and sequences


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Identifiers and Naming

Object names and column names are not case sensitivein Oracle, but are sorted in the data dictionary in uppercase unless forced to be case sensitive using delimiters

Object and column names are stored in system catalog

in the same case as specified in the DDLIn Oracle and SQL Server, object names have to beunique within the same schema

Defining schemas and ownership differ very slightly

between Oracle and SQL Server


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Managing Tables

There is a generictable definition syntaxin Oracle and SQLServer

There are varioustypes of tables inOracle and SQL Server

Components ofcolumn definition are

column name, datatype, default valueand constraints(optional)


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Managing Constraints

Types of constraints found in Oracle and SQL Server are: NOT NULL

CHECK

UNIQUE

PRIMARY KEY FOREIGN KEY

Constraints can be definedin-line with column definition or out-of-line as table constraints

Constraints on single columns can be defined as column

constraints or table constraints, and multi-column constraints aredefined as table constraints

Primary key constraints are enforced using unique indexes and NOTNULL constraints in both Oracle and SQL Server


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Demonstration 1: Referential Integrity via Constraints

In this demonstration you will see how to:

Define a table with a Primary Key

Validate with Foreign Keys

Insert data and view an exception and asuccess


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Managing Triggers

SQL Server INSTEAD OF triggerssimilar to BEFORE triggers in Oracle

SQL Server triggers are at the statement level

Oracle uses

pseudo-row structures:new and :old

SQL Server - pseudo-tablesDELETED and INSERTED

Unlike Oracle, SQL Servercan define First and LastTrigger in a set.


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Demonstration 2: Referential Integrity via Triggers

In this demonstration you will see how to:

Define a trigger

Validate and auto commit or rollbacktransaction (insert)


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Managing Indexes

Unique and non-unique non-clustered B-tree indexes arefound in both Oracle and SQL Server

SQL Server clustered indexes are similar to Oracleindex-organized tables

SQL Server indexes can be created, dropped, rebuilt, orreorganized offline or online

SQL Server provides indexing on XML and Spatial datatypes

SQL Server 2012 includes xVelocity memory optimizedcolumnstore indexes to speed up data warehousingqueries


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Demonstration 3: Create and Maintain Indexes

In this demonstration you will see how to:Create an Included Index with SSMS

Compare execution plans and results

Create the Included Index with T-SQL

Rebuild the Index


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Demonstration 4: Create indexed view

Demonstration:

Create indexed view


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Review

We learned how Oracle and SQL Server differ in theinterpretation of identifier names in schema objectdefinitions

We compared types of tables and indexes found in

Oracle and SQL Server and learned how to create andmaintain them

We went over the differences in selection of storageparameters between Oracle and SQL Server

We compared other schema objects in Oracle and SQLServer such as constraints, triggers, views andsequences and learned how to manage them

m_09_1.00 managing schema objects with demos and labs 2012.pdf

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