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You use the SPLIT and MERGE operators with the ALTER PARTITION FUNCTION Transact-SQL command to introduce new boundary points or remove boundary points from a partition function, respectively. The general syntax is as follows:
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ALTER PARTITION FUNCTION partition_function_name() { SPLIT RANGE ( boundary_value ) | MERGE RANGE ( boundary_value ) } [ ; ]
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The following example command introduces a new boundary point to the partition function named partfunc:
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ALTER PARTITION FUNCTION partfunc () SPLIT RANGE (6000);
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This statement causes the number of partitions for the table to be increased by one. Any data with a value greater than 6,000 that existed in the table would be moved to the new partition. Note that this operation could cause a large number of writes as SQL Server moves the rows to a different filegroup. The following example removes a boundary point from the partition function named partfunc.
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ALTER PARTITION FUNCTION partfunc () MERGE RANGE (1000);
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This statement causes the number of partitions for the table to decrease by one. Any data that existed in the partition that was removed would be combined into a single
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Lesson 5: Managing Partitions
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partition. This also could cause a large number of writes as SQL Server moves the rows to a different filegroup.
SWITCH
You can use the SWITCH operator of the ALTER TABLE Transact-SQL command to perform two actions:
Add rows to a table. Remove rows from a table.
You can add rows to a table by using an INSERT statement and remove them by using a DELETE statement. So what is so special about the SWITCH operator An INSERT or DELETE operation causes SQL Server to acquire locks on a table, which blocks other processes. If you are adding or removing a large number of rows from a table, the operation can result in severe contention and take a long time to complete. The SWITCH operator, in contrast, is infinitely scalable and does not cause blocking on a table. It also lets you add or remove any number of rows in less than one second. To understand how SWITCH works, you first need to understand how data is stored within SQL Server. All data is stored on a series of 8-KB pages within a database. Each table and each index has its own series of 8-KB pages, which are constructed in a doubly linked list. A doubly linked list simply means that each page points to the previous page as well as the next page within the chain (for example, page 3 points to pages 2 and 4, whereas page 4 points to pages 3 and 5). When a table is partitioned, SQL Server splits the data structure across filegroups so that each partition contains a sequential series of pages. If you were to go into the last page within a partition and remove the entry that points to the first page in the next partition, the entire series of pages within that partition would immediately disappear from the table. At the same time, if you were to go into the last page in a table (whose next page pointer would be null, indicating that it is the last page in the table) and change the next page entry to a page in another partition, the entire series of pages in that partition would immediately become part of the table. Remember that a SWITCH operation occurs between tables. Let s look at a simple example to see what happens when you perform a SWITCH operation. Suppose that you have a reporting application that allows queries against the orders. The table contains only the last 12 months of orders, and orders are added to this table once per month. You create two tables: Orders and Orderstage. Orders for the current month are
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