adding etl docs

Author: jodebrui

samples/databases/wide-world-importers/documentation/wwi-etl.md

@@ -1,7 +1,58 @@
 # WideWorldImporters ETL Workflow
 
-This folder contains documentation for the sample.
+The ETL package WWI_Integration is used to migrate data from the WideWorldImporters database to the WideWorldImportersDW database as the data changes. The package is run periodically (most commonly daily).
 
-Start with [root.md](root.md)
+## Overview
 
-Note that these contents will most likely be migrated to MSDN.
+The design of the package uses SQL Server Integration Services (SSIS) to orchestrate bulk T-SQL operations (rather than as separate transformations within SSIS) to ensure high performance.
+
+Dimensions are loaded first, followed by Fact tables. The package can be re-run at any time after a failure.
+
+The workflow is as follows:
+
+![Alt text](/media/wide-world-importers-etl-workflow.png "WideWorldImporters ETL Workflow")
+
+It starts with an expression task that works out the appropriate cutoff time. This time is the current time less a few seconds. (This is more robust than requesting data right to the current time). It then truncates any milliseconds from the time.
+
+The main processing starts by populating the Date dimension table. It ensures that all dates for the current year have been populated in the table.
+
+After this, a series of data flow tasks loads each dimension, then each fact.
+
+## Prerequisites
+
+- SQL Server 2016 (or higher) with the databases WideWorldImporters and WideWorldImportersDW. These can be on the same or different instances of SQL Server.
+- SQL Server Management Studio (SSMS)
+- SQL Server 2016 Integration Services (SSIS).
+  - Make sure you have created an SSIS Catalog. If not, right click **Integration Services** in SSMS Object Explorer, and choose **Add Catalog**. Follow the defaults. It will ask you to enable sqlclr and provide a password.
+
+
+## Download
+
+The latest release of the sample:
+
+[wide-world-importers-v0.1](https://github.com/Microsoft/sql-server-samples/releases/tag/wide-world-importers-v0.1)
+
+Download the SSIS package file **Daily ETL.ispac**.
+
+Source code to recreate the sample database is available from the following location.
+
+[wide-world-importers](https://github.com/Microsoft/sql-server-samples/tree/master/samples/databases/wide-world-importers/wwi-integration-etl)
+
+## Install
+
+1. Deploy the SSIS package.
+ - Open the "Daily ETL.ispac" package from Windows Explorer. This will launch the Integration Services Deployment Wizard.
+ - Under "Select Source" follow the default Project Deployment, with the path pointing to the "Daily ETL.ispac" package.
+ - Under "Select Destination" enter the name of the server that hosts the SSIS catalog.
+ - Select a path under the SSIS catalog, for example under a new folder "WideWorldImporters".
+ - Finalize the wizard by clicking Deploy.
+
+2. Create a SQL Server Agent job for the ETL process.
+ - In SSMS, right-click "SQL Server Agent" and select New->Job.
+ - Pick a name, for example "WideWorldImporters ETL".
+ - Add a Job Step of type "SQL Server Integration Services Package".
+   - Select the server with the SSIS catalog, and select the "Daily ETL" package.
+   - Under Configuration->Connection Managers ensure the connections to the source and target are configured correctly. The default is to connect to the local instance.
+ - Click OK to create the Job.
+
+3. Execute or schedule the Job.

samples/databases/wide-world-importers/documentation/wwi-olap-sample-queries.md

@@ -1,7 +1,5 @@
 # WideWorldImportersDW OLAP Sample Queries
 
-This folder contains documentation for the sample.
+Refer to the sample-scripts.zip file that is included with the release of the sample, or refer to the source code:
 
-Start with [root.md](root.md)
-
-Note that these contents will most likely be migrated to MSDN.
+[wide-world-importers/sample-scripts](https://github.com/Microsoft/sql-server-samples/tree/master/samples/databases/wide-world-importers/sample-scripts)