SQL Server 最小化日志操作解析,应用

create database testbulk
go
use master
ALTER DATABASE [testbulk] SET RECOVERY BULK_LOGGED WITH NO_WAIT
go
use testbulk
go

create table t1(id int not null identity (1,1),dystr varchar(200),fixstr char(500));
go
set nocount on
declare @i int
set @i=0
while(@i<20000)
begin
  insert into t1(dystr,fixstr)values(‘aaa‘+str(RAND()*100000000),‘bbb‘+str(RAND()*100000000))
  set @i=@i+1
end



create table tcls
(
id int ,
dystr varchar(200),
fixstr char(500)
)
go
CREATE UNIQUE CLUSTERED INDEX inx_id ON dbo.tcls (id)


insert into dbo.tcls with(tablockx)
select * from dbo.t1 ----cluster table empty

select operation,CONTEXT,[Log Record Length],AllocUnitName from fn_dblog(null,null)
where AllocUnitName like ‘%tcls%‘

truncate table tcls
DBCC SHRINKFILE (N‘testbulk_log‘ , 0, TRUNCATEONLY)

insert into dbo.tcls with(tablockx) values  (100000,‘aaa‘,‘bbb‘)----made not empty clustered table
go
insert into dbo.tcls with(tablockx)
select * from dbo.t1 
----cluster table not empty

select operation,CONTEXT,[Log Record Length],AllocUnitName from fn_dblog(null,null)
where AllocUnitName like ‘%tcls%‘

create table tnoncls
(
id int ,
dystr varchar(200),
fixstr char(500)
)
go


insert into dbo.tnoncls with(tablockx) values (100000,‘aaa‘,‘bbb‘)----made not empty heap table no index
go
insert into dbo.tnoncls with(tablockx)
select * from dbo.t1  with(tablockx)----heap table not empty with no index


select operation,CONTEXT,[Log Record Length],AllocUnitName from fn_dblog(null,null)
where AllocUnitName like ‘%tnoncls%‘ 

truncate table tnoncls----truncate table
DBCC SHRINKFILE (N‘testbulk_log‘ , 0, TRUNCATEONLY)

CREATE UNIQUE NONCLUSTERED INDEX inx_id ON dbo.tnoncls (id)----add non clustered index

insert into dbo.tnoncls with(tablockx) values (100000,‘aaa‘,‘bbb‘)----made not empty heap table with index
go
insert into dbo.tnoncls with(tablockx)
select * from dbo.t1  with(tablockx)----heap table not empty with  index

select operation,CONTEXT,[Log Record Length],AllocUnitName from fn_dblog(null,null)
where AllocUnitName like ‘%tnoncls%‘----both datapage and indexpage full log