Create sqlvss_generate_backup_filename_ranges_sample.sql

samples/features/sqlvss/sqlvss_generate_backup_filename_ranges_sample.sql

@@ -0,0 +1,68 @@
+/*
+DISCLAIMER: © 2016 Microsoft Corporation. All rights reserved. Sample scripts in this guide are not supported under any Microsoft standard support program or service. 
+The sample scripts are provided AS IS without warranty of any kind. Microsoft disclaims all implied warranties including, without limitation, any implied warranties 
+of merchantability or of fitness for a particular purpose. The entire risk arising out of the use or performance of the sample scripts and documentation remains with you. 
+In no event shall Microsoft, its authors, or anyone else involved in the creation, production, or delivery of the scripts be liable for any damages whatsoever 
+(including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or 
+inability to use the sample scripts or documentation, even if Microsoft has been advised of the possibility of such damages.
+*/
+
+--Sample script to generate file name for ranges in vss backup instead of range buffer
+-- create database.
+create database test;
+GO
+
+use test;
+GO
+-- create a table such that each row is on a page
+create table tab
+	(ID INT IDENTITY NOT NULL PRIMARY KEY, 
+	 BIGSTRING VARCHAR(7996)
+	 );
+declare @dml NVARCHAR(300); --for query
+declare @RowCount int; -- RowCount iterator
+set @RowCount = 0;
+set @dml = 'INSERT INTO tab(BIGSTRING) VALUES(REPLICATE(''a'', 7996));'
+
+--Max row count we need to insert, 150k rows gives us close to 65kb buffer
+--using below updates, I have kept it 200k which gives 98kb buffer, anything above
+--64 kb will give us filename instead of range values.
+
+declare @MaxRowCount int;
+set @MaxRowCount = 200000;
+
+--Insert the rows
+
+while @RowCount < @MaxRowCount
+
+begin
+       exec(@dml);
+       set @RowCount = @RowCount + 1;
+end
+
+-- TAKE THE FULL BACKUP HERE, We use betest.exe here.
+--BETEST.EXE /B /E /T FULL /S backupdoc_full.txt /D c:\tools\sqlbetest\backup\full /C comp1_file.txt
+
+-- here we update the rows I re-declared the variables as I executed it as separate script
+-- I am updating every 17th row so, we update alternate extent, which will make range buffer big.
+
+declare @dml NVARCHAR(300);
+declare @RowCount int;
+declare @MaxRowCount int;
+set @MaxRowCount = 200000;
+set @RowCount = 1;
+
+while @RowCount < @MaxRowCount
+begin
+       set @dml = 'UPDATE tab set BIGSTRING = REPLICATE(''b'', 7996) where ID = ' + cast(@RowCount as varchar(10)) + ';';
+       exec(@dml);
+       set @RowCount = @RowCount + 16;
+end
+
+
+-- Take differential backup here. 
+--  BETEST.exe /B /E /T DIFFERENTIAL /Pre backupdoc_full.txt /S backupdoc_diff.txt /D c:\tools\sqlbetest\backup\diff /C comp1_file.txt
+
+
+
+