ORACLE DEVELOPER TOOLS FOR VISUAL STUDIO

Time for a .NET Tune-Up

Tune your .NET application’s use of Oracle Database with Oracle Developer Tools for Visual Studio.

D clause in the query changing dynamically

eveloping a .NET and Oracle applica-

SYSDBA privileges to use Oracle Performance

with every loop. It then fetches all the data typical lifecycle. It includes many steps, such

tion in Microsoft Visual Studio follows a

Analyzer, and the HR user will need the

ADVISOR privilege to use SQL Tuning Advisor.

for each query.

as creating users and roles, assigning

Consider the large query created against privileges, creating tables and stored proce-

The application we will develop requires

the HR.EMPLOYEES, HR.DEPARTMENTS, dures, generating SQL scripts, writing .NET

two new tables based on the HR schema.

HR. EMPLOYEES2, and HR.DEPARTMENTS2 code with Oracle Data Provider for .NET

From Visual Studio, right-click the root

tables. Given that we’re still in the develop- (ODP.NET), and checking everything into

node of Server Explorer and create a new

ment phase without access to real-world pro- source control.

Oracle connection, as HR. Next, right-

duction data, how can we tell if that query will Another important phase of the develop-

click the HR connection and choose Query

perform well? Well, one way is to put it into ment lifecycle involves tuning your applica-

Window . In the query window that opens,

SQL Tuning Advisor and see what comes back. tion’s use of Oracle Database to maximize

enter create table employees2 as

Copy and paste the query from the code performance. Luckily, tools that enhance per-

select * from employees and click the

into the HR query window you opened earlier. formance are among the major new features

execute button (the green arrow in the query

The query in the .NET code is missing a value in Oracle Developer Tools for Visual Studio

window toolbar). Next, erase that statement,

at the end of the WHERE clause, so just add Release 11.1.0.7.20. Oracle Performance

enter create table departments2 as

the number 0 at the end. Your query should Analyzer analyzes your application’s use of

select * from departments , and again

execute the statement.

look like this:

Oracle Database under load and provides recommendations for resolving performance

select employees2.salary problems. SQL Tuning Advisor tunes SQL—

TUNING SQL

from employees2, departments2 both ad hoc SQL typed in at development

To follow along, download the Visual Studio

where employees2.department_id= time and SQL flagged by Oracle Performance

project associated with this article, available

departments2.department_id Analyzer as poorly performing. These tools

at otn.oracle.com/oramag/oracle/10-may/

and employees2.salary <3000 union leverage Oracle Database’s Automatic

o30odpodt.zip. Open the Visual Studio

select employees.salary Workload Repository (AWR) feature, which

project; you’ll see that the bulk of the code

from employees, departments captures database statistics, and Automatic

in the main source file (ReallyBadCode.cs) is

where employees.department_ Database Diagnostic Monitor (ADDM) feature,

shown in Listing 1. Take a close look at it. It

id=departments.department_id which analyzes these statistics and generates

creates a connection pool and then repeat-

and employees.salary =0; recommendations for fixing problems. In this article, we will use these tools to help us clean up a poorly performing application, aptly named ReallyBadCode.

edly executes a query, with the WHERE

ORACLE DEVELOPER TOOLS FOR VISUAL STUDIO