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How to Loop through all DBs in an Instance?


How to Loop through all DBs in an Instance?

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ReamerXXVI
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Hi,

Can anyone provide a method to loop through a DB's in an instance WITHOUT using the proc sp_MSforeachdb

I have tried the following, and the "EXEC(@String)" does not error, but I always stay in the context of the DB I run it from.

Very frustrating, there must be a way to do this?!?!?!?

------------------------------------------

DECLARE @DatabaseName nvarchar(50)
DECLARE @String nvarchar(50)

SELECT name
INTO #nameOfAllDbsInTheInstance
FROM sys.sysdatabases

DECLARE DBName CURSOR
FOR SELECT D.[name]
FROM #nameOfAllDbsInTheInstance AS D
OPEN DBName
FETCH NEXT FROM DBName
INTO @DatabaseName
      
WHILE @@FETCH_STATUS = 0
   
   BEGIN

      SET @String = 'USE ' + @DatabaseName
      PRINT @String
   
      EXEC(@String)
      SELECT DB_NAME()
   
      FETCH NEXT FROM DBName
      INTO @DatabaseName
         
   END

DROP TABLE #nameOfAllDbsInTheInstance
CLOSE DBName
DEALLOCATE DBName

------------------------------------------
Bhuvnesh
Bhuvnesh
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YOur cursor doesnt do here anything , simply "USe database"
What actaully you are trying to achieve here ?

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
ReamerXXVI
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It is just an example, the cursor here just gets the DBName and I try and change to the context of that DB.

I know it's not actually do anything as it is just and example, the whole point is how to change DB context dynamically?
Bhuvnesh
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tom.moore.777 89426 (1/23/2013)
the whole point is how to change DB context dynamically?

yes it can be done with the same way as you did but need additional code too like :



set @lstr = 'USe ' + @databasename + '; create table Test (id int ) ;'
exec (@lstr)

this will create test table in all the databases passed by @databasename from cursor

-------Bhuvnesh----------
I work only to learn Sql Server...though my company pays me for getting their stuff done;-)
Kingston Dhasian
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tom.moore.777 89426 (1/23/2013)

Can anyone provide a method to loop through a DB's in an instance WITHOUT using the proc sp_MSforeachdb


Any particular reason for avoiding the use of sp_MSforeachdb?


Kingston Dhasian

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Kingston Dhasian (1/23/2013)
tom.moore.777 89426 (1/23/2013)

Can anyone provide a method to loop through a DB's in an instance WITHOUT using the proc sp_MSforeachdb


Any particular reason for avoiding the use of sp_MSforeachdb?


msForeachdb has a few bugs and limits.

iirc there was a character limitation. There is also inconsistent behavior such as it skipping databases.



Jason AKA CirqueDeSQLeil
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Here are two alternatives to sp_MSforeachdb

http://sqlblog.com/blogs/aaron_bertrand/archive/2010/12/29/a-more-reliable-and-more-flexible-sp-msforeachdb.aspx

And then this one that I have been using:
http://spaghettidba.com/2011/09/09/a-better-sp_msforeachdb/

With a few samples of usage here
http://jasonbrimhall.info/2012/07/17/a-trio-of-eachdb/



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anthony.green
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If you want to do the same thing in each database, then this would be another alternative solution


DECLARE @SQL NVARCHAR(MAX)

SELECT @SQL =
   REPLACE(
      CAST(
         (
            SELECT 'USE ' + QUOTENAME(name) +';' + CHAR(13) + CHAR(10) +
            --PUT WHAT YOU WANT TO DO IN EACH DATABASE IN THIS BLOCK
            ----
               'SELECT ' + CHAR(13) + CHAR(10) +
                  'DatabaseName = DB_NAME(), ' + CHAR(13) + CHAR(10) +
                  'a.FILEID, ' + CHAR(13) + CHAR(10) +
                  '[FILE_SIZE_MB] = CONVERT(DECIMAL(12, 2), ROUND(a.size / 128.000, 2)), ' + CHAR(13) + CHAR(10) +
                  '[SPACE_USED_MB] = CONVERT(DECIMAL(12, 2), ROUND(fileproperty(a.NAME, ' + CHAR(39) + 'SpaceUsed' + CHAR(39) +') / 128.000, 2)), ' + CHAR(13) + CHAR(10) +
                  '[FREE_SPACE_MB] = CONVERT(DECIMAL(12, 2), ROUND((a.size - fileproperty(a.NAME, ' + CHAR(39) + 'SpaceUsed' + CHAR(39) +')) / 128.000, 2)), ' + CHAR(13) + CHAR(10) +
                  'a.NAME, a.FILENAME ' + CHAR(13) + CHAR(10) +
               'FROM dbo.sysfiles a;' + CHAR(13) + CHAR(10)
            ----
            FROM
               sys.databases
            FOR XML PATH('')
         Wink AS NVARCHAR(MAX)
      Wink,
      '&#x 0D;',CHAR(13) + CHAR(10)
   Wink
   --SELECT @SQL
EXECUTE sp_executesql @SQL



Just remove the space between the x and the 0 in the following string in the script '&#x 0D;'

The above example loops through all the databaes and gets their file usage, free space, used space, total space etc, so I can track DB growth.



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