Repartitioning a table

This functionality is available in Adaptive Server 15.0 and later.

By default, Adaptive Server creates every table with a single, round-robin partition. You can repartition a table according to these strategies:

Range – distributes rows among partitions according to values in the partitioning keys. The partitioning key or keys of each row are compared with a set of upper and lower bounds to determine which partition the row belongs to.
- Every partition has an inclusive upper bound, which is specified when the partition is created.
- Every partition except the first has a noninclusive lower bound, which is specified implicitly by the upper bound on the next-lower partition.
List – distributes rows among partitions according to values in the partitioning key. The partitioning key of each row is compared with a unique set of specified values associated with each partition to determine the appropriate partition.
Hash – uses a hash function to specify the partition to which a row is assigned. The user selects the partitioning key columns; Adaptive Server chooses the hash function and controls the partition assignment.
Round-robin – assigns rows in a round-robin manner to each partition so that each partition contains an approximately equal number of rows.

Double-click the Repartition icon in the right pane. The Create Partition wizard opens. The wizard asks for this information:

**Table 17-5: Inputs to the Create Partition wizard**
Input	Description
Hash, Range, List, or Round-robin	Choice of partitioning strategy.
Partition Key Columns	Table columns that determine how the table is to be partitioned. For hash-, list-, and range-partitioned tables only. List partitioning has only one key column.
Partition Name	Name of partition (optional).
Segment	Segment name (optional).
Values	Enter values for range or list partitions.