Adding UTF8 requirements script and Notebook

Author: pmasl

samples/features/sql2019notebooks/README.md

@@ -32,6 +32,7 @@ The [What's New](https://docs.microsoft.com/sql/sql-server/what-s-new-in-sql-ser
 * **[Storage.ipynb](https://github.com/microsoft/sql-server-samples/blob/master/samples/features/unicode/notebooks/Storage.ipynb)** - In this notebook, you will see how to the storage footprint differences are expressive between Unicode encoded in UTF-8 and UTF-16.
 * **[Perf_Latin.ipynb](https://github.com/microsoft/sql-server-samples/blob/master/samples/features/unicode/notebooks/Perf_Latin.ipynb)** - In this notebook, you will see the performance differences of using string data encoded in UTF-8 and UTF-16 using Latin data.
 * **[Perf_Non-Latin.ipynb](https://github.com/microsoft/sql-server-samples/blob/master/samples/features/unicode/notebooks/Perf_Non-Latin.ipynb)** - In this notebook, you will see the performance differences of using string data encoded in UTF-8 and UTF-16 using non-Latin data.
+* **[CheckStorageReq_CurrDB.ipynb](https://github.com/microsoft/sql-server-samples/blob/master/samples/features/unicode/notebooks/CheckStorageReq_CurrDB.ipynb)** - In this notebook, you will be able to determine the UTF8 storage requirements for all tables and string columns in the database in scope.
 
 ### SQL Server 2019 Querying 1 TRILLION rows
 * **[OneTrillionRowsWarm.ipynb](https://github.com/microsoft/sql-server-samples/blob/master/samples/features/sql2019notebooks/OneTrillionRowsWarm.ipynb)** - This notebook shows how SQL Server 2019 reads **9 BILLION rows/second** using a 1 trillion row table using a warm cache,

samples/features/unicode/CheckStorageReq_CurrDB.sql

@@ -0,0 +1,51 @@
+-- Assess space requirements for UTF8 in context database
+
+DROP TABLE IF EXISTS #tmpObjects;
+
+CREATE TABLE #tmpObjects (ObjectName sysname, 
+	ColumnName sysname, 
+	ColumnType sysname, 
+	DefinedTypeSize smallint, 
+	ActualMaxBytes smallint,
+	UTF8BytesNeeded smallint,
+	[isdone] bit,
+    CONSTRAINT PK_ObjName_ColName
+        PRIMARY KEY NONCLUSTERED (ObjectName, ColumnName)
+		WITH (IGNORE_DUP_KEY = ON)
+	);
+
+INSERT INTO #tmpObjects
+SELECT QUOTENAME(SS.[name]) + '.' + QUOTENAME(STbl.[name]), QUOTENAME(SC.[name]), ST.[name], SC.max_length, NULL, NULL, 0
+FROM sys.columns AS SC
+INNER JOIN sys.types AS ST ON SC.user_type_id = ST.user_type_id
+INNER JOIN sys.tables AS STbl ON STbl.[object_id] = SC.[object_id]
+INNER JOIN sys.schemas AS SS ON STbl.[schema_id] = SS.[schema_id]
+WHERE STbl.[type] = 'U' 
+	AND STbl.is_ms_shipped = 0
+	--AND STbl.temporal_type IN (0,1)
+	AND ST.system_type_id IN (167, 175, 231, 239)
+	AND ST.[name] <> 'sysname'
+	AND SC.is_hidden = 0
+	AND SC.max_length > 0;
+
+DECLARE @OName sysname, @CName sysname, @CurrBytes smallint, @UTF8Bytes smallint, @sqlcmd NVARCHAR(4000), @params NVARCHAR(60), @cnt int, @maxcnt int
+
+SELECT @maxcnt = COUNT(*) FROM #tmpObjects;
+SET @cnt = 0 
+SET @params = '@CurrBytesOut smallint OUTPUT, @UTF8BytesOut smallint OUTPUT'
+
+WHILE @cnt < @maxcnt
+BEGIN
+	SELECT TOP 1 @OName = ObjectName, @CName = ColumnName FROM #tmpObjects WHERE isdone = 0
+	SELECT @sqlcmd = 'SELECT @CurrBytesOut = MAX(DATALENGTH(' + @CName + ')), @UTF8BytesOut = MAX(DATALENGTH(CAST(' + @CName + ' AS VARCHAR(4000)) COLLATE Latin1_General_100_CI_AI_SC_UTF8)) FROM ' + @OName; 
+
+	EXEC sp_executesql @sqlcmd, @params, @CurrBytesOut = @CurrBytes OUTPUT, @UTF8BytesOut = @UTF8Bytes OUTPUT
+
+	UPDATE #tmpObjects
+	SET ActualMaxBytes = @CurrBytes, UTF8BytesNeeded = @UTF8Bytes, isdone = 1 
+	WHERE ObjectName = @OName AND ColumnName = @CName
+
+	SET @cnt = @cnt + 1
+END;
+
+SELECT * FROM #tmpObjects;