What are the possible reasons that cause the
INVALID_CURSOR
exception to occur?Cursor result set has not been fetched.
The cursor does not have parameters.
The value of the
%ROWCOUNT
attribute has been referenced after closing the cursor.Cursor result set has been fetched into a non matching variable.
Identify the guidelines to be considered when designing cursors in a PL/SQL block:
Explicit cursors must be used irrespective of the number of records returned by the query.
Cursor
FOR
loops must be used as it implicitly takes care ofOPEN
,FETCH
, andCLOSE
stages.Cursor data must be fetched as a record.
Use
ROWNUM
to index the records in the cursor result sets.
While processing DMLs as implicit cursors in a PL/SQL executable block, implicit cursor attributes can be used anywhere in the block.
True.
False.
From the following options, identify the two correct statements about the
REF
CURSOR
type?Ref
cursors are reference pointers to cursor objects.REF
CURSOR
types can be declared in...
Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition
By :
Advanced Oracle PL/SQL Developer's Guide (Second Edition) - Second Edition
By:
Overview of this book
Oracle Database is one of the most popular databases and allows users to make efficient use of their resources and to enhance service levels while reducing the IT costs incurred. Oracle Database is sometimes compared with Microsoft SQL Server, however, Oracle Database clearly supersedes SQL server in terms of high availability and addressing planned and unplanned downtime. Oracle PL/SQL provides a rich platform for application developers to code and build scalable database applications and introduces multiple new features and enhancements to improve development experience.
Advanced Oracle PL/SQL Developer's Guide, Second Edition is a handy technical reference for seasoned professionals in the database development space. This book starts with a refresher of fundamental concepts of PL/SQL, such as anonymous block, subprograms, and exceptions, and prepares you for the upcoming advanced concepts. The next chapter introduces you to the new features of Oracle Database 12c, not limited to PL/SQL. In this chapter, you will understand some of the most talked about features such as Multitenant and Database In-Memory. Moving forward, each chapter introduces advanced concepts with the help of demonstrations, and provides you with the latest update from Oracle Database 12c context. This helps you to visualize the pre- and post-applications of a feature over the database releases. By the end of this book, you will have become an expert in PL/SQL programming and will be able to implement advanced concepts of PL/SQL for efficient management of Oracle Database.
Table of Contents (19 chapters)
Advanced Oracle PL/SQL Developer's Guide Second Edition
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Free Chapter
Overview of PL/SQL Programming Concepts
Oracle 12c SQL and PL/SQL New Features
Designing PL/SQL Code
Using Collections
Using Advanced Interface Methods
Virtual Private Database
Oracle SecureFiles
Tuning the PL/SQL Code
Result Cache
Analyzing, Profiling, and Tracing PL/SQL Code
Safeguarding PL/SQL Code against SQL injection
Working with Oracle SQL Developer
Index
Customer Reviews