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WORKING WITH TASKS Part 1Naveen

17Ap r 2 0 11

The Workflow Manager contains m any types o f tasks to help you build workflows

and worklets. We can create reusable tasksin the Task Develo per.

Types of t asks:

Task Type Tool where t ask can

be created

Reusable or no t

Session Task Developer Yes

0

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utorials-naveen.blogspot.com/2011/04/contact-us.htmlhttp://naveen-plsql.blogspot.com/http://unixshellscripts.blogspot.com/http://naveen-datawarehousing.blogspot.com/http://informaticatutorials-naveen.blogspot.com/http://informaticatutorials-naveen.blogspot.in/


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Performance-Tuning

Necessity Of

Performance-tuning

Identification Of bo ttle

Necks

Optimization o f Bottle

necks

Performance tuning o f

Looku

Email Workflow Designer Yes

Command Worklet Designer Yes

Event-Raise Workflow Designer No

Event-Wait Worklet Designer No

Timer No

Decision No

Ass ignm ent No

Contro l No

SESSION TASK

A sessio n is a set o f ins tructions that tells the Power Center Server ho wand when to mo ve data from so urces to targets.

To run a session, we must first create a workflow to contain the Session

task.

We can run as many sessions in a workflow as we need. We can run the

Session tasks sequentially or co ncurrently, depending on o ur needs.

The Power Center Server creates several files and in-memory caches

depending on the transformations and o ptions used in the sessio n.

EMAIL TASK

The Workflow Manager provides an Email task that allows us to send email

during a workflow.

Created by Administrator usually and we just drag and use it in our

mapping.

Steps:

1. In the Task Develope r or Workflow Designer, choo se Tasks-Create.

2. Select an Email task and enter a name fo r the task. Click Create.

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2. Pre- and post- session shell com mand:We can call a Command task as

the pre- or post-session shell command for a Session task. This is done in

COMPONENTS TAB of a session. We can run it in Pre-Session Command or

Post Session Success Command or Post Session Failure Command. Select the

Value and Type optio n as we did in Em ail task.

Example:to copy a file sample.txt from D drive to E.

Command: COPY D:\sample.txt E:\ in windo ws

Ste ps for creating command task:

1. In the Task Develope r or Workflow Designer, choo se Tasks-Create.

2. Select Comm and Task for the task type.

3. Enter a name for the Comm and task. Click Create. Then click done.

4. Double-click the Comm and task. Go to comm ands tab.

5. In the Commands tab, click the Add button to add a comm and.

6. In the Name field, enter a name for the new com mand.

7. In the Com mand field, click the Edit button to open the Com mand Edito r.

8. Enter only one comm and in the Comm and Editor.9. Click OK to close the Comm and Editor.

10. Repeat steps 5-9 to add mo re commands in the task.

11. Cl ick OK.

Ste ps to create t he workflo w using command task:

1. Create a task using the above steps to copy a file in Task Developer.

2. Open Workflow Des igner. Workflow -> Create -> Give name and click ok.

3. Start is displayed. Drag session say s_m_Filter_example and command

task.

4. Link Start to Sessio n task and Sessio n to Com mand Task.

5. Double click link between Session and Command and give condition in

editor as

6. $S_M_FILTER_EXAMPLE.Status=SUCCEEDED

7. Workflow-> Validate

8. Repository > Save

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WORKING WITH EVENT TASKS

We can define events in the workflow to specify the sequence o f task execution.

Types of Events:

Pre-defined event:A pre-defined event is a file-watch event. This eventWaits for a specified file to arrive at a given location .

User-defined event: A use r-defined event is a sequence o f tasks in the

Workflow. We create events and then raise them as per need.

Ste ps for creating User Defined Event :

1. Open any workflow where we want to create an event.

2. Click Workflow- > Edit -> Events tab.

3. Click to Add button to add events and give the names as pe r need.

4. Click Apply -> Ok. Validate the workflow and Save it.

Types of Events Tasks:

EVENT RAISE:Event-Raise task represents a user-defined event. We use

this task to raise a user defined event.

EVENT WAIT: Event-Wait task waits for a file watcher event or user

defined event to occur before executing the next session in the workflow.

Example1:Use an event wait task and make sure that session s_filter_example

runs when abc.txt file is presen t in D:\FILES folder.

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3. Drag s_m _filter_example and link it to START task.

4. Click Tasks -> Create -> Select EVENT RAISE from list. Give name

5. ER_Example. Cli ck Create and then do ne.Link ER_Exam ple to

s_m_filter_example.

6. Right click ER_Example -> EDIT -> Properties Tab -> Open Value for User

Defined Event and Select EVENT1 from the list dis played. Apply -> OK.

7. Click link between ER_Example and s_m_filter_example and give the

condi tion $S_M_FILTER_EXAMPLE.Status=SUCCEEDED

8. Click Tasks -> Crea te -> Select EVENT WAIT from list. Give nam e

EW_WAIT. Click Create and then do ne.

9. Link EW_WAIT to START task.

10. Right click EW_WAIT -> EDIT-> EVENTS tab.

11. Select User Defined there. Select the Event1 by clicking Browse Events

button.

12. Apply -> OK.

13. Drag S_M_TOTAL_SAL_EXAMPLE and link it to EW_WAIT.

14. Mapp ing -> Validate

15. Repo sitory -> Save.

16. Run workflow and see.

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