昨天做了個日常大數據歸檔，歸檔700W數據，表字段130左右，字段比較多，分享下！

----先禁用表的index

1.先獲取需要禁用的索引

declare @tname varchar(100)
set @tname='orders'
select? 'alter index '+' '+c.indexname+' '+'on'+' '+@tname+' '+'disable'
from
(
select * from
(
SELECT
OBJECT_NAME(i.OBJECT_ID) AS TableName,
i.name AS IndexName,
i.index_id AS IndexID,
8 * SUM(a.used_pages)/1024 AS 'Indexsize(MB)'
FROM sys.indexes AS i
JOIN sys.partitions AS p ON p.OBJECT_ID = i.OBJECT_ID AND p.index_id = i.index_id
JOIN sys.allocation_units AS a ON a.container_id = p.partition_id
GROUP BY i.OBJECT_ID,i.index_id,i.name
)a
where a.tablename=@tname
--order by [Indexsize(MB)] desc
)c

go

?

--2.禁止上面語句獲得索引，但是主鍵和clustered index別禁用，切記！

?

----刪除數據

DBCC DROPCLEANBUFFERS?
DBCC FREEPROCCACHE
go
SET NOCOUNT ON
BEGIN TRANSACTION
while 1=1?
begin
?delete top(20000) from dbo.orders?? with(TABLOCK)
?where ordertime <'2010-1-1'
if @@rowcount<20000
?break?
end
commit
go

?

----索引重建

alter index all on orders rebuild
go

?

基本上很短時間搞定，為了性能，需要完成索引rebuild和統計信息更新！

?

轉載于:https://blog.51cto.com/ocpyang/1194501

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