读取SQL的Agent代理的日志文件

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use msdb
go

if exists (select * from sysobjects where name = N'sp_sqlagent_read_errorlog' and type ='P')
    drop proc dbo.sp_sqlagent_read_errorlog
go

create proc dbo.sp_sqlagent_read_errorlog @fileversion int = null
as

set nocount on

declare @rc int
declare @version int
declare @pos int
declare @errorlog_file nvarchar(255)
declare @filename nvarchar(255)
declare @filename_no_ext nvarchar(255)
declare @dirname nvarchar(255)
declare @buf nvarchar(255)

-- SQL Server 7.0
if (charindex(N'7.00',@@version,0) > 0)
begin
    exec @rc = master.dbo.xp_regread 
        N'HKEY_LOCAL_MACHINE',N'SOFTWAREMicrosoftMSSQLServerSQLServerAgent',N'ErrorLogFile',@errorlog_file OUTPUT,N'no_output'
end

-- SQL Server 2000 needs to use instance aware Registry read 
if (charindex(N'8.00',0) > 0)
begin
    exec @rc = master.dbo.xp_instance_regread 
        N'HKEY_LOCAL_MACHINE',N'no_output'
end

-- reverse the string to find the last slash ''
select @buf = reverse(@errorlog_file)

-- determine posiktion of last slash,now first slash in reversed string
select @pos = len(@buf) - charindex(char(92),@buf,0) + 1

-- extract the directory only part,part before the last slash
select @dirname = substring(@errorlog_file,@pos)

-- extract the filename,part after the last slash
select @filename = substring(@errorlog_file,@pos + 1,len(@errorlog_file) - @pos)

-- extract the filename with extension,part after dot in @filename
select @filename_no_ext  = substring(@filename,charindex(N'.',@filename,0))

-- change errorlog file to version X
if (@fileversion is not null)
    select @errorlog_file = @dirname +N'' +  @filename_no_ext + N'.' + convert(nchar,@fileversion)

-- read file
exec master.dbo.xp_readerrorlog 1,@errorlog_file
go

-- sample usage

-- read currently active log file,SQLAGENT.OUT
-- exec msdb.dbo.sp_sqlagent_read_errorlog

-- read version 1 of log,SQLAGENT.1
-- exec msdb.dbo.sp_sqlagent_read_errorlog 1

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