SqlServer清理数据库日志

--清空所有数据库日志

declare @exec_sql nvarchar(1200),@simple_sql nvarchar(1200),@full_sql nvarchar(1200)
declare @db_name varchar(128)
declare @db_count int
select @db_count=COUNT(1) from sys.databases where database_id >4
declare @j int
set @j =1

while @j<=@db_count
begin
select @db_name=name from (select ROW_NUMBER()
over(order by name)rn,name from sys.databases
where database_id >4 )as tmp where rn=@j
SET @simple_sql=N' use [master] ' + Char(10) + Char(13)
+'ALTER DATABASE ['+@db_name+'] SET RECOVERY SIMPLE WITH NO_WAIT'
EXEC Sp_executesql  @simple_sql,N'@db_name varchar(128)',@db_name

SET @exec_sql=N'USE ['+@db_name+']'+ Char(10) + Char(13)
+'DBCC SHRINKFILE (N'''+@db_name+'_log'' , 0, TRUNCATEONLY)'
EXEC Sp_executesql  @exec_sql,N'@db_name varchar(128)',@db_name

SET @full_sql =N' use [master] ' + Char(10) + Char(13)
+'ALTER DATABASE ['+@db_name+'] SET RECOVERY FULL WITH NO_WAIT'
EXEC Sp_executesql  @full_sql,N'@db_name varchar(128)',@db_name

set @j =@j+1
end