MSSQL分区表性能并不比普通表强吗

发布网友发布时间：2022-04-10 04:50

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懂视网时间：2022-04-10 09:12

, [20030101, 20040101), [20040101, 999909999)

Examples

A. Creating a RANGE LEFT partition function on an int column

The following partition function will partition a table or index into four partitions.

tsql

CREATE PARTITION FUNCTION myRangePF1 (int) 
AS RANGE LEFT FOR VALUES (1, 100, 1000);

The following table shows how a table that uses this partition function on partitioning column col1 would be partitioned.

Partition	1	2	3	4
Values	col1 <= `1`	col1 > `1` AND col1 <= `100`	col1 > `100` AND col1 <=`1000`	col1 > `1000`

B. Creating a RANGE RIGHT partition function on an int column

The following partition function uses the same values for boundary_value [ ,...n ] as the previous example, except it specifies RANGE RIGHT.

tsql

CREATE PARTITION FUNCTION myRangePF2 (int) 
AS RANGE RIGHT FOR VALUES (1, 100, 1000);

The following table shows how a table that uses this partition function on partitioning column col1 would be partitioned.

Partition	1	2	3	4
Values	col1 < `1`	col1 >= `1` AND col1 < `100`	col1 >= `100` AND col1 < `1000`	col1 >= `1000`

C. Creating a RANGE RIGHT partition function on a datetime column

The following partition function partitions a table or index into 12 partitions, one for each month of a year‘s worth of values in a datetime column.

tsql

CREATE PARTITION FUNCTION [myDateRangePF1] (datetime) 
AS RANGE RIGHT FOR VALUES (‘20030201‘, ‘20030301‘, ‘20030401‘, 
  ‘20030501‘, ‘20030601‘, ‘20030701‘, ‘20030801‘, 
  ‘20030901‘, ‘20031001‘, ‘20031101‘, ‘20031201‘);

The following table shows how a table or index that uses this partition function on partitioning column datecol would be partitioned.

Partition	1	2	...	11	12
Values	datecol < `February 1, 2003`	datecol >= `February 1, 2003` AND datecol < `March 1, 2003`		datecol >= `November 1, 2003` AND col1 < `December 1, 2003`	datecol >= `December 1, 2003`

mssqlserver分区表的左值与右值

标签：cep UI 一个右值 sof class ros partition http

热心网友时间：2022-04-10 06:20

你若过有磁盘阵列的话性能会高一些
如果只有一块硬盘,即便是你分了区, 各个区还是在一个磁盘上, 他的读写速度并不会提高