Merge pull request #107192 from djpmsft/docUpdates

adding transformation overview

Author: GitHubber17

articles/data-factory/TOC.yml

@@ -479,6 +479,8 @@
       href: control-flow-webhook-activity.md
   - name: Data flow transformations
     items:
+    - name: Transformation overview
+      href: data-flow-transformation-overview.md
     - name: Aggregate
       href: data-flow-aggregate.md
     - name: Alter row

articles/data-factory/data-flow-transformation-overview.md

@@ -0,0 +1,36 @@
+---
+title: Mapping data flow transformation overview
+description: An overview of the different transformations available in mapping data flow
+author: djpmsft
+ms.author: daperlov
+manager: anandsub
+ms.service: data-factory
+ms.topic: conceptual
+ms.date: 03/10/2020
+---
+
+# Mapping data flow transformation overview
+
+Below is a list of the transformations currently supported in mapping data flow. Click on each transformations to learn its configuration details.
+
+| Name | Category | Description |
+| ---- | -------- | ----------- |
+| [Aggregate](data-flow-aggregate.md) | Schema modifier | Define different types of aggregations such as SUM, MIN, MAX, and COUNT grouped by existing or computed columns. | 
+| [Alter row](data-flow-alter-row.md) | Row modifier | Set insert, delete, update, and upsert policies on rows. |
+| [Conditional split](data-flow-conditional-split.md) | Multiple inputs/outputs | Route rows of data to different streams based on matching conditions. |
+| [Derived column](data-flow-derived-column.md) | Schema modifier | generate new columns or modify existing fields using the data flow expression language. | 
+| [Exists](data-flow-exists.md) | Multiple inputs/outputs | Check whether your data exists in another source or stream. | 
+| [Filter](data-flow-filter.md) | Row modifier | Filter a row based upon a condition. |
+| [Flatten](data-flow-flatten.md) | Schema modifier |  Take array values inside hierarchical structures such as JSON and unroll them into individual rows. |
+| [Join](data-flow-join.md) | Multiple inputs/outputs |  Combine data from two sources or streams. |
+| [Lookup](data-flow-lookup.md) | Multiple inputs/outputs | Reference data from another source. |
+| [New branch](data-flow-new-branch.md) | Multiple inputs/outputs | Apply multiple sets of operations and transformations against the same data stream. |
+| [Pivot](data-flow-pivot.md) | Schema modifier | An aggregation where one or more grouping columns has its distinct row values transformed into individual columns. |
+| [Select](data-flow-select.md) | Schema modifier | Alias columns and stream names, and drop or reorder columns |
+| [Sink](data-flow-sink.md) | - | A final destination for your data |
+| [Sort](data-flow-sort.md) | Row modifier | Sort incoming rows on the current data stream |
+| [Source](data-flow-source.md) | - | A data source for the data flow |
+| [Surrogate key](data-flow-surrogate-key.md) | Schema modifier | Add an incrementing non-business arbitrary key value |
+| [Union](data-flow-union.md) | Multiple inputs/outputs | Combine multiple data streams vertically |
+| [Unpivot](data-flow-unpivot.md) | Schema modifier | Pivot columns into row values |
+| [Window](data-flow-window.md) | Schema modifier |  Define window-based aggregations of columns in your data streams. |

includes/azure-data-factory-limits.md

@@ -16,7 +16,7 @@ Azure Data Factory is a multitenant service that has the following default limit
 
 | Resource | Default limit | Maximum limit |
 | -------- | ------------- | ------------- |
-| Data factories in an Azure subscription |	50 | [Contact support](https://azure.microsoft.com/blog/2014/06/04/azure-limits-quotas-increase-requests/). |
+| Data factories in an Azure subscription |	800 | [Contact support](https://azure.microsoft.com/blog/2014/06/04/azure-limits-quotas-increase-requests/). |
 | Total number of entities, such as pipelines, data sets, triggers, linked services, and integration runtimes, within a data factory | 5,000 | [Contact support](https://azure.microsoft.com/blog/2014/06/04/azure-limits-quotas-increase-requests/). |
 | Total CPU cores for Azure-SSIS Integration Runtimes under one subscription | 256 | [Contact support](https://azure.microsoft.com/blog/2014/06/04/azure-limits-quotas-increase-requests/). |
 | Concurrent pipeline runs per data factory that's shared among all pipelines in the factory | 10,000  | [Contact support](https://azure.microsoft.com/blog/2014/06/04/azure-limits-quotas-increase-requests/). |