Credit for this script really goes to ToddV (see http://www.sqlteam.com/Forums/topic.asp?TOPIC_ID=13737)
The following script issues a DBREINDEX command against every table in every database on your server. It can be modified to issue other commands, but this one in particular is helpful as we are migrating about 30 databases from SQL 7 to SQL 2000 (new server) and re-indexing is recommended. Here's the script:
DECLARE @SQL NVarchar(4000)
SET @SQL = ''
SELECT @SQL = @SQL + 'EXEC ' + NAME + '..sp_MSforeachtable @command1=''DBCC DBREINDEX (''''*'''')'', @replacechar=''*''' + Char(13)
FROM MASTER..Sysdatabases
WHERE dbid > 6 -- skip the 6 built-in databases. Remove to process ALL
PRINT @SQL -- Only if you want to see the code you're about to execute.
EXEC (@SQL)
Notes: There is a limit (nvarchar 4000) to how big your command can be, so too many databases will halt this.
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GENERAL-ly speaking...