fix names

Author: XiaoyuMSFT

articles/sql-data-warehouse/TOC.yml

@@ -130,15 +130,15 @@
     - name: Materialized view
       items:
       - name: Performance tuning guidance  
-        href: sql-data-warehouse-performance-tuning-with-materialized-views.md
+        href: performance-tuning-materialized-views.md
       - name: Create
         href: /sql/t-sql/statements/create-materialized-view-as-select-transact-sql
       - name: Alter
         href: /sql/t-sql/statements/alter-materialized-view-transact-sql
     - name: Ordered clustered columnstore index
       items:
       - name: Performance tuning guidance  
-        href: sql-data-warehouse-performance-tuning-with-ordered-CCI.md
+        href: performance-tuning-ordered-CCI.md
     - name: Result set caching
       href: /sql/t-sql/statements/set-result-set-caching-transact-sql  
     - name: Tables

articles/sql-data-warehouse/media/performance-tuning-materialized-views/output-list.png

@@ -337,7 +337,7 @@ GROUP BY c_customer_id
 ```
 Check the execution plan of the original query again.  Now the number of joins changes from 17 to 5 and there's no shuffle anymore.  Click the Filter operation icon in the plan, its Output List shows the data is read from the materialized views instead of base tables.  
 
- ![Plan_Output_List_with_Materialized_Views](media/performance-tuning-materialized-views/output_list.png)
+ ![Plan_Output_List_with_Materialized_Views](media/performance-tuning-materialized-views/output-list.png)
 
 With materialized views, the same query runs much faster without any code change.  
 

articles/sql-data-warehouse/media/performance-tuning-ordered-cci/cci-data-loading-performance.png

@@ -42,7 +42,7 @@ The performance of data loading into an ordered CCI table is similar to data loa
 Loading data into an ordered CCI table can take more time than data loading into a non-ordered CCI table because of the data sorting.  
 
 Here is an example performance comparison of loading data into tables with different schemas.
-![Performance_comparison_data_loading](media/performance-tuning-ordered-cci/cci_data_loading_performance.png)
+![Performance_comparison_data_loading](media/performance-tuning-ordered-cci/cci-data-loading-performance.png)
 
 ## Reduce segment overlapping
 Below are options to further reduce segment overlapping when creating ordered CCI on a new table via CTAS or on an existing table with data: