Creating a partition function on a char column Partitionĭatecol = FebruAND datecol = NovemAND col1 = December 1, 2003ĭ. The following table shows how a table or index that uses this partition function on partitioning column datecol would be partitioned. 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. Creating a RANGE RIGHT partition function on a datetime column CREATE PARTITION FUNCTION myRangePF2 (int)ĪS RANGE RIGHT FOR VALUES (1, 100, 1000) Ĭ. The following partition function uses the same values for boundary_value as the previous example, except it specifies RANGE RIGHT. Creating a RANGE RIGHT partition function on an int column The following table shows how a table that uses this partition function on partitioning column col1 would be partitioned. CREATE PARTITION FUNCTION myRangePF1 (int) ![]() The following partition function will partition a table or index into four partitions. ![]() Creating a RANGE LEFT partition function on an int column This permission defaults to members of the sysadmin fixed server role and the db_owner and db_ddladmin fixed database roles.ĬONTROL or ALTER permission on the database in which the partition function is being created.ĬONTROL SERVER or ALTER ANY DATABASE permission on the server of the database in which the partition function is being created.Įxamples A. PermissionsĪny one of the following permissions can be used to execute CREATE PARTITION FUNCTION:ĪLTER ANY DATASPACE permission. In this case, the left-most partition is an empty partition, and NULL values are placed in the following partition. Within the database, partition functions reside in a separate namespace from the other functions.Īny rows whose partitioning column has null values are placed in the left-most partition, unless NULL is specified as a boundary value and RIGHT is indicated. The scope of a partition function is limited to the database that it is created in. Specifies to which side of each boundary value interval, left or right, the boundary_value belongs, when interval values are sorted by the Database Engine in ascending order from left to right. The Database Engine returns an error if n includes any duplicate values. If the values are not in order, the Database Engine sorts them, creates the function, and returns a warning that the values are not provided in order. The values do not have to be listed in order. The number of partitions created is equal to n + 1. Specifies the number of values supplied by boundary_value, not to exceed 14,999. To determine the language session of your server, run SELECT more information, see Nondeterministic conversion of literal date strings into DATE values. To make sure the partition function definition behaves as expected for all session languages, we recommend that you use constants that are interpreted the same way for all language settings, such as the yyyymmdd format or explicitly convert literals to a specific style. If boundary_value consists of datetime or smalldatetime literals, these literals are evaluated assuming that us_english is the session language. ![]() Boundary_value must either match or be implicitly convertible to the data type supplied in input_parameter_type, and cannot be truncated during implicit conversion in a way that the size and scale of the value does not match that of its corresponding input_parameter_type. It cannot reference Transact-SQL expressions. This includes user-defined type variables, or functions and user-defined functions. Only one partitioning column, specified in a CREATE TABLE or CREATE INDEX statement, can be used.īoundary_value is a constant expression that can reference variables. If boundary_value is empty, the partition function maps the whole table or index using partition_function_name into a single partition. Specifies the boundary values for each partition of a partitioned table or index that uses partition_function_name. The actual column, known as a partitioning column, is specified in the CREATE TABLE or CREATE INDEX statement. All data types are valid for use as partitioning columns, except text, ntext, image, xml, timestamp, varchar(max), nvarchar(max), varbinary(max), alias data types, or CLR user-defined data types. Is the data type of the column used for partitioning. Partition function names must be unique within the database and comply with the rules for identifiers. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.
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