Defining PostgreSQL Table Indexes

The following properties are applicable to a PostgreSQL Table Indexes.

Tab	Section	Property	Description	Additional Properties
		Physical Name	Displays the physical name of the table index
		Type	Displays the table's index type
		Is Unique	Specifies to allow only unique values in the table index. Clear this check box to allow non-unique values	Click to create a new index. Use the Enter filter text box to filter a very large list of indexes to quickly locate the one that you want to define.
		Exclude	Prevents two rows from having the same values in a table, depending on the operator used
		If Not Exists	Specifies if the table index already exists, no exception is thrown, and no action happens
		Physical Only	Specifies whether to have the index appear in the physical model only. If you want the index to appear in the logical model as a key group, clear the check box	This option is unavailable when a primary or foreign key index is selected.
		Generate	Generates SQL during forward engineering. Clear the check box if you do not want to generate SQL
		Generate As Constraint	Indicates that when the index is generated, it will be generated as a constraint
Members		Column	Specifies the name of a column of the table
		Collation	Specifies the name of the collation to use for the index
		OpClass	Specifies the name of an operator class
		Operator	Specifies the name of the operator
		OpClass Parameter	Specifies the parameters for the operator class
		Sort Order	Specifies the order in which index values are stored	Ascending: Indicates that the index values are sorted in ascending order Descending: Indicates that the index values are sorted in descending order Random: Indicates that the index values are sorted in random order
		Nulls Order	Specifies the order in which null values are stored	Nulls FIRST: Specifies that nulls sort before non-nulls. This is the default when DESC is specified. Nulls LAST: Specifies that nulls sort after non-nulls. This is the default when DESC is not specified
		Column / Expression	Specifies the column expression on which the index is based
General	Index Options	Concurrent Build	Indicates that the index is built without taking any locks that prevent concurrent inserts, updates, or deletes on the table. Whereas a standard index build locks out writes (but not reads) on the table until it is done
		Only	Indicates not to recurse creating indexes on partitions, if the table is partitioned
		Access Method	Specifies the name of the index method to be used. Choices are btree, hash, gist, spgist, and gin. The default method is btree.
		Unique Nulls	Indicates whether all values in a particular column(s) are unique	Distinct: Multiple NULLs are allowed Not Distinct: Only one NULL value is allowed in the column(s) with the unique constraint or index
		Where	Indicates that a partial index is to be created. A partial index is an index that contains entries for only a portion of a table, usually a portion that is more useful for indexing than the rest of the table. The expression used in the WHERE clause can refer only to columns of the underlying table, but it can use all columns, not just the ones being indexed.
	Storage Options	Storage Parameters	The name of an index method-specific storage parameter.
	Storage Options	Tablespace	Specifies the tablespace in which the new index is to be created. If not specified, default tablespace is consulted, or temp tablespaces if the table is temporary. Select an existing tablespace from the drop-down list or click to create one.
	Constraint Options	Deferrable	Allows deferring constraint checks until the end of the transaction	Deferrable: Controls whether the index is deferrable. Not Deferrable: Controls whether the index is not deferrable.
	Constraint Options	Deferred	Specifies that the constraint should initially be checked at the end of the transaction	Initially Deferred: Indicates that the index should be checked only at the end of the transaction. Initially Immediate: Indicates that the index should be checked after each statement.
	Also Include	Column	Allows adding non-indexed columns to the index, known as "payload." This optimization provides necessary columns directly from the index, avoiding table lookups.

(Optional) Click the Comment tab and enter any comments that you want to associate with the object.
(Optional) Click the Where Used tab to view where the object is used within the model.
(Optional) Click the UDP tab to work with user-defined properties for the object.
(Optional) Click the Notes tab to view and edit user notes.
(Optional) Click the Extended Notes tab to view or edit user notes.
Click Close.
The table index is defined and the PostgreSQL Table Index Editor closes.