Shrink Database Size for SAT


I routinely have to backup and restore databases from customer’s prod environment to the SAT environment. The SAT environment is often limited in terms of storage so I like it when I can do little things that make a big impact on storage size.

Below is a SQL script I use to change the recovery for databases. The Full recovery model used in production is useful in order to play back transaction logs but unnecessary in SAT.

--Will Change recovery model of all databases (except tempdb) to simple.
 
--Declaration of variables
DECLARE @DBName SysName, @sql VarChar(100)
-- Declare begin cursor to get the database names and get info from sys.databases catalog
DECLARE Cursor_db Cursor FOR SELECT Name From sys.Databases WHERE Name != 'TempDB'
-- Now using the cursor to loop through database names and change recovery model
OPEN Cursor_db Fetch NEXT From Cursor_db INTO @DBName 
--While Loop with Alter database command
WHILE @@fetch_status = 0
BEGIN--print 'database is ' + @DBName 
SET @sql='ALTER Database ' + @DBName + ' SET Recovery Simple'
PRINT 'sql is ' + @sql
exec (@sql)
 
Fetch Next FROM Cursor_db INTO @DBName 
END--clean up objects
CLOSE Cursor_db 
Deallocate Cursor_db 

 

The next script will shrink the log files for all the databases once you are in simple recovery mode.

--The files will not shrink if you don't have the recovery model set to simple
 
--suppress counts from being returned.
set nocount on;
--Declaration of variables
DECLARE @LogFile SysName, @DBName SysName, @sql VarChar(1000)
-- Declare begin cursor to get the file names. Join two tables to get the log file name
--and the datbase name for use in the use databasename statement
DECLARE Cursor_db Cursor FOR SELECT a.name as LogFileName, b.name as DbName
    FROM sys.master_files a, sys.databases b
    where a.type_desc = 'LOG' 
        and a.name not in ('templog')
        and a.database_id = b.database_id
-- Now using the cursor to loop through log file names and shrink
OPEN Cursor_db Fetch NEXT From Cursor_db INTO @LogFile, @DBName
--While Loop with Alter database command
WHILE @@fetch_status = 0
BEGIN--print 'Shrinking ' + @LogFile + '...'
SET @sql='use ' + @DBName + ';  DBCC SHRINKFILE(' + @LogFile + ', 1);'
PRINT 'sql is ' + @sql
exec (@sql)
 
Fetch Next FROM Cursor_db INTO @LogFile, @DBName
END--clean up objects
CLOSE Cursor_db 
Deallocate Cursor_db 
 
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