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EMS SQL Manager for Oracle

On-line Documentation

Partitioning


The Partitioning tab is provided for setting up partitioning parameters for a partitioned materialized view. It appears when the CheckBox Partitioning option is enabled at the main tab of the editor.

 

Materialized View Editor - Partitioning

 

Partitioning by

Range

Select this item to partition the materialized view on ranges of values from the column list. For an index-organized materialized view, the column list must be a subset of the primary key columns of the materialized view.

Hash

Select this item to specify that the materialized view is to be partitioned using the hash method. Oracle Database assigns rows to partitions using a hash function on values found in columns designated as the partitioning key.

List

Select this item to partition the materialized view on lists of literal values from column. List partitioning is useful for controlling how individual rows map to specific partitions.

 

Partition keys

Use this group to specify an ordered list of columns used to determine into which partition a row belongs. These columns are the partitioning key.

To select a column, you need to move it from the Available list to the Selected list. Use the Move all to Selected Move to Selected Move to Available Move all to Available buttons or drag-and-drop operations to move the columns from one list to another.

 

CheckBox Composite

If this option is selected, the materialized view is first partitioned by range, and then the partitions are further partitioned into range, hash, or list sub-partitions.

 

Sub-partition keys

Use this group to specify an ordered list of columns used to determine into which sub-partition a row belongs. These columns are the sub-partitioning key.

To select a column, you need to move it from the Available list to the Selected list. Use the Move all to Selected Move to Selected Move to Available Move all to Available buttons or drag-and-drop operations to move the columns from one list to another.

 

Sub-partitioning by

Use the drop-down list to indicate the type of sub-partitioning you want for each composite range partition: hash or list.

 

Partitions

This area allows you to specify individual partitions. Right-click within the list area to call the context menu allowing you to create a new partition, edit or delete the selected partition.

 

Values

Specify the non-inclusive upper bound for the current partition. The value list is an ordered list of literal values corresponding to the column list.