The Data warehouse has recently been upgraded to the next version called Gen2. The good news is that the upgrade process is relatively seamless.

Upgrading is supposed to be a one step process but I have decided to add 2 extra steps:

1. Backup / Take a snapshot
2. Upgrade the data warehouse
3. Rebuild all indexes

Backup / Take s snapshot

PS /Users/piro>New-AzureRmSqlDatabaseRestorePoint -ResourceGroupName "ResourceGroup01" -ServerName "Server01" -DatabaseName "Database01" -RestorePointLabel "RestorePoint01"

For more information refer to New-AzureRmSqlDatabaseRestorePoint.

Upgrade the data warehouse

At present the only way to upgrade is to use the portal. To upgrade login into the portal and navigate the Azure SQL database. A new option to upgrade will be available in the database overview blade.

Rebuild all indexes

IF OBJECT_ID('tempdb..#tables') IS NOT NULL DROP TABLE #tables
CREATE TABLE #tables
WITH(DISTRIBUTION = ROUND_ROBIN, HEAP)
AS
SELECT s.name AS table_schema, t.name AS table_name FROM [sys].[tables] t
INNER JOIN sys.schemas s ON t.schema_id = s.schema_id
WHERE t.[is_external] = 0;

DECLARE @tableName VARCHAR(MAX)
DECLARE @schemaName VARCHAR(MAX)
DECLARE @sql VARCHAR(MAX)

WHILE EXISTS (SELECT 1 FROM #tables)
BEGIN
SET @tableName = (SELECT TOP(1) table_name FROM #tables ORDER BY table_schema ASC, table_name ASC)
SET @schemaName = (SELECT TOP(1) table_schema FROM #tables ORDER BY table_schema ASC, table_name ASC)
SET @sql = 'ALTER INDEX ALL ON [' + @schemaName + '].['+ @tableName + '] REBUILD'
EXEC(@sql)
DELETE #tables WHERE table_name = @tableName and table_schema = @schemaName
END
IF OBJECT_ID('tempdb..#tables') IS NOT NULL DROP TABLE #tables

Link to GitHub Code, RebuildIndex.sql

More information here, Optimize performance by upgrading SQL Data Warehouse