 What is DB Testing ?  Testing at the Data Access Layer  Need for Testing DB Objects  Common Problems that affect the Application  Should Testers Know Databases  Writing Test Cases to Test Databases  Testing Tools  Examples

 Database Testing includes Testing for Data Integrity, Data Validity, Data manipulation.  Database Objects can be tables, views, stored procedures, indexes etc  Time taken for Retrieval of Records from the Database  Time for Query Execution

 Client Layer – Is responsible for the presentation of data, receiving user events and controlling the user interface.  Application Layer - Business-objects that implement the business rules "live" here, and are available to the client-tier  Data Layer : This tier is responsible for data storage

 Testing the Front End / GUI / Client Layer  Testing the Business Logic Layer  Testing the Database  Reviewing E/R Diagrams  Reviewing the Database Designs  Reviewing the Tables, views, stored procedures etc

 Data is stored in the tables  Stored Procedures will handle the Insertion, deletion & Updation & Retrieval of Information from the Database  No Testing/Improper testing will result in missing critical application functionality

 Traditionally all the data testing is done at the GUI Level  Corruption of data can occur at any layer  We must present verification of application correctness as data travels through the system.

 Data corruption  Occurs due to poor design  Redundant data  Hidden duplicate records (same customer added twice with different primary keys).  Inconsistent data  Data records added to the same database through multiple applications can add inconsistent data.

 Validate the table naming conventions  Validate the column naming conventions  To check if the correct datatype is selected for a column  To check the consistency in datatypes for columns common across tables  To ensure the usage of correct field width

 To ensure consistency in field width for columns common across tables  Existence of a primary key on a table  Existence of a foreign key on a table  Validity of check constraints  Validity of default constraints  Check for presence of indexes on a column

 Check for Unique indexes  Existence of non-clustered indexes  Existence of clustered indexes  Note the time of execution of queries  Note the time of compilation of queries

 Evaluate the query execution plan  Note the time of execution of stored procedures  Note the time of compilation of stored procedures  Evaluate the query execution plan  Denormalize the tables  Normalize the tables

SQL TunerSQL Tuner : Embaradero Eases the complexity of writing high-performance SQL code by providing built-in help for writing syntactically correct SQL, and by assisting in every aspect of complex tuning efforts.

Datatect Datatect : Banner Software Generate a variety of realistic test data to RDBMS including Oracle, Sybase, SQL Server, and Informix DB Stress DB Stress : Utility for stress testing the server parts of information systems and applications, as well as DBMSs and servers themselves.

 Database Opensource Test Suite  The Database Opensource Test Suite (DOTS) is a set of test cases designed for the purpose of stress-testing database server systems in order to measure database server performance and reliability.

 DBMonster  DBMonster is an application to generate random data for testing SQL database driven applications under heavy load.

[Test] public void ColumnTypeIsNotDeprecated() { const string cmdText t.name AS tableName, c.name AS columnName, ty.name AS columnType FROM sys.tables t JOIN sys.columns c ON c.object_id = t.object_id JOIN sys.types ty ON ty.system_type_id = c.system_type_id AND ty.user_type_id = c.user_type_id WHERE ty.name = 'text' OR ty.name = 'ntext' OR ty.name = 'image' OR ty.name = 'datetime'";. Assert.That(deprecatedColumns, Is.Empty, "Column types are deprecated (text, ntext, image, datetime). Use varchar(max), nvarchar(max), varbinary(max) and datetime2(0) instead."); }

ALTER PROCEDURE TryItOut. AS BEGIN INT; = 1 + 2; EXEC tSQLt.AssertEquals END GO Video: WzcFz0 (tsSQLt) WzcFz0

 What Database Testing includes?  What Database Objects can by tested?  How many layers exists in a Application?  What pproblems can happened if Database Testing is Ignored?  What we can Test at the DB Level? (Min 3)