sp_MSforeachdb获得所有的数据库的存储空间

/*********************************************************************************
　sp_MSforeachdb 系统存储过程有6个参数:
    @command1 nvarchar(2000) --第一条运行的t-sql指令
    @replacechar nchar(1) = N'?' --指定的占位符号
    @command2 nvarchar(2000) = null --第二条运行的t-sql指令
    @command3 nvarchar(2000) = null  --第三条运行的t-sql指令
    @precommand nvarchar(2000) = null  --在sp_MSforeach_worker前执行的指令
    @postcommand nvarchar(2000) = null --在sp_MSforeach_worker后执行的指令
  ************************************************************************************/

/*  
* The following table definition will be created by SQLDMO at start of each connection.  
* We don't create it here temporarily because we need it in Exec() or upgrade won't work.  
*/  
  
create proc sp_MSforeachdb  
@command1 nvarchar(2000), @replacechar nchar(1) = N'?', @command2 nvarchar(2000) = null, @command3 nvarchar(2000) = null,  
@precommand nvarchar(2000) = null, @postcommand nvarchar(2000) = null  
as  
    set deadlock_priority low  
      
/* This proc returns one or more rows for each accessible db, with each db defaulting to its own result set */  
/* @precommand and @postcommand may be used to force a single result set via a temp table. */  

/* Preprocessor won't replace within quotes so have to use str(). */  
  declare @inaccessible nvarchar(12), @invalidlogin nvarchar(12), @dbinaccessible nvarchar(12)  
  select @inaccessible = ltrim(str(convert(int, 0x03e0), 11))  
select @invalidlogin = ltrim(str(convert(int, 0x40000000), 11))  
select @dbinaccessible = N'0x80000000'  /* SQLDMODbUserProf_InaccessibleDb; the negative number doesn't work in convert() */  
   if (@precommand is not null)  
      exec(@precommand)  
  
declare @origdb nvarchar(128)  
select @origdb = db_name()  
  
/* If it's a single user db and there's an entry for it in sysprocesses who isn't us, we can't use it. */  
   /* Create the select */  
exec(N'declare hCForEach cursor global for select name from master.dbo.sysdatabases d ' +  
   N' where (d.status & ' + @inaccessible + N' = 0)' +  
   N' and ((DATABASEPROPERTY(d.name, ''issingleuser'') = 0 and (has_dbaccess(d.name) = 1)) or ' +  
   N' ( DATABASEPROPERTY(d.name, ''issingleuser'') = 1 and not exists ' +  
   N' (select * from master.dbo.sysprocesses p where dbid = d.dbid and p.spid <> @@spid)))' )  
  
declare @retval int  
select @retval = @@error  
if (@retval = 0)  
  exec @retval = sp_MSforeach_worker @command1, @replacechar, @command2, @command3  
  
if (@retval = 0 and @postcommand is not null)  
  exec(@postcommand)  
  
   declare @tempdb nvarchar(258)  
   Select @tempdb = REPLACE(@origdb, N']', N']]')  
   exec (N'use ' + N'[' + @tempdb + N']')  
  
  return @retval  



usage:

sp_msforeachdb除了@whereand外,和sp_msforeachtable的参数是一样的,我们可以通过这个存储过程检测所有的数据库,比如:
　　1.获得所有的数据库的存储空间:
　　exec sp_msforeachdb @command1="print '?'",
　　@command2="sp_spaceused "
　　2.检查所有的数据库
　　exec sp_msforeachdb @command1="print '?'",
　　@command2="dbcc checkdb (?) "