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Transactions and Error Handling in SQL Server

Learn to write scripts that will catch and handle errors and control for multiple operations happening at once.

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4 Hours14 Videos52 Exercises
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Course Description

It is critical to know how to handle errors and manage transactions when programming SQL scripts. Unhandled errors can be very harmful and can cause unexpected situations, such as inconsistent data in your database, or even worse, errors can lead you to make wrong business decisions. In this course, you will learn how to handle errors and discover how to manage transactions in case of an error. Additionally, you will study what happens when two or more people interact at the same time with the same data. You will practice all these concepts using two datasets, one of them based on bank accounts and the other one on an electric bike store.
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  1. 1

    Starting with error handling

    Free

    To begin the course, you will learn how to handle errors using the TRY...CATCH construct that provides T-SQL. You will study the anatomy of errors, and you will learn how to use some functions that can give you information about errors.

    Play Chapter Now
    Welcome!
    50 xp
    The TRY...CATCH syntax
    50 xp
    Your first error-handling script
    100 xp
    Nesting TRY...CATCH constructs
    100 xp
    Error anatomy and uncatchable errors
    50 xp
    Anatomy review
    50 xp
    Correcting compilation errors
    100 xp
    Giving information about errors
    50 xp
    Error function syntax
    50 xp
    Using error functions
    100 xp
    Using error functions in a nested TRY...CATCH
    100 xp
  2. 2

    Raising, throwing and customizing your errors

    In this chapter, you will deepen your knowledge of handling errors. You will learn how to raise errors using RAISERROR and THROW. Additionally, you will discover how to customize errors.

    Play Chapter Now
    RAISERROR
    50 xp
    RAISERROR syntax
    50 xp
    CATCHING the RAISERROR
    100 xp
    THROW
    50 xp
    THROW with or without parameters
    50 xp
    THROW without parameters
    100 xp
    Executing a stored procedure that throws an error
    100 xp
    THROW with parameters
    100 xp
    Customizing error messages in the THROW statement
    50 xp
    Ways of customizing error messages
    50 xp
    Concatenating the message
    100 xp
    FORMATMESSAGE with message string
    100 xp
    FORMATMESSAGE with message number
    100 xp
  3. 3

    Transactions in SQL Server

    In this chapter, you will be introduced to the concept of transactions. You will discover how to commit and rollback them. You will finish by learning how to return the number of transactions and their state.

    Play Chapter Now
    Transactions
    50 xp
    Transaction statements
    50 xp
    Correcting a transaction
    100 xp
    Rolling back a transaction if there is an error
    100 xp
    Choosing when to commit or rollback a transaction
    100 xp
    @@TRANCOUNT and savepoints
    50 xp
    Modifiers of the @@TRANCOUNT value
    50 xp
    Checking @@TRANCOUNT in a TRY...CATCH construct
    100 xp
    Using savepoints
    100 xp
    XACT_ABORT & XACT_STATE
    50 xp
    XACT_ABORT behavior
    50 xp
    XACT_ABORT and THROW
    100 xp
    Doomed transactions
    100 xp
  4. 4

    Controlling the concurrency: Transaction isolation levels

    This chapter defines what concurrency is and how it can affect transactions. You will learn exciting concepts like dirty reads, repeatable reads, and phantom reads. To avoid or allow this reads, you will explore, one by one, the different transaction isolation levels.

    Play Chapter Now
    Transaction isolation levels
    50 xp
    Concurrency phenomena
    50 xp
    Using the READ UNCOMMITTED isolation level
    100 xp
    READ COMMITTED & REPEATABLE READ
    50 xp
    Choosing the correct isolation level
    50 xp
    Prevent dirty reads
    100 xp
    Preventing non-repeatable reads
    100 xp
    SERIALIZABLE isolation level
    50 xp
    Prevent phantom reads in a table
    100 xp
    Prevent phantom reads just in some rows
    100 xp
    SNAPSHOT
    50 xp
    Setting READ COMMITTED SNAPSHOT to ON
    50 xp
    Comparing WITH (NOLOCK) & READ UNCOMMITTED
    50 xp
    Avoid being blocked
    100 xp
    Congratulations!
    50 xp

In the following tracks

SQL Server DeveloperSQL Server for Database Administrators

Datasets

Electric bike store dataset and Bank accounts dataset

Collaborators

Collaborator's avatar
Mona Khalil
Collaborator's avatar
Marianna Lamnina

Prerequisites

Intermediate SQL Server
Miriam Antona HeadshotMiriam Antona

Software Engineer

Miriam is a freelance Software Engineer with 15+ years of experience. She is focused on analyzing, designing, and developing software applications. She also collaborates with the UOC University supervising Bachelor theses. Miriam loves programming and experimenting with different technologies. She is passionate about databases and enjoys playing with data. She holds a Master of Science Degree in Computer Engineering.
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