sql server 分区表数据迁移时巧用switch

-- create partition function

CREATE PARTITION FUNCTION partRange1 (INT)

AS RANGE LEFT FOR VALUES (10, 20, 30) ;

GO

-- create partition scheme

CREATE PARTITION SCHEME partScheme1

AS PARTITION partRange1

ALL TO ([PRIMARY]) ;

GO

-- create table that uses this partitioning scheme

CREATE TABLE partTable (col1 INT, col2 VARCHAR(20))

ON partScheme1 (col1) ;

GO

--查询分区情况

SELECT *

FROM sys.partitions

WHERE OBJECT_ID = OBJECT_ID('partTable')

GO

-- insert some sample data

INSERT INTO partTable (col1, col2) VALUES (5, 'partTable')

INSERT INTO partTable (col1, col2) VALUES (6, 'partTable')

INSERT INTO partTable (col1, col2) VALUES (7, 'partTable')

GO

-- select the data

SELECT * FROM partTable

go

-- switch in

CREATE TABLE newPartTable (col1 INT CHECK (col1 > 30 AND col1 <= 40 AND col1 IS NOT NULL),

col2 VARCHAR(20))

GO

-- insert some sample data into new table

INSERT INTO newPartTable (col1, col2) VALUES (31, 'newPartTable')

INSERT INTO newPartTable (col1, col2) VALUES (32, 'newPartTable')

INSERT INTO newPartTable (col1, col2) VALUES (33, 'newPartTable')

-- select the data

SELECT * FROM partTable

SELECT * FROM newPartTable

go

-- make the switch

ALTER TABLE newPartTable SWITCH TO partTable PARTITION 4;

GO

-- select the data

SELECT * FROM partTable

SELECT * FROM newPartTable

go

-- switch out

CREATE TABLE nonPartTable (col1 INT, col2 VARCHAR(20))

ON [primary] ;

GO

-- make the switch

ALTER TABLE partTable SWITCH PARTITION 1 TO nonPartTable ;

GO

-- select the data

SELECT * FROM partTable

SELECT * FROM nonPartTable