Materialized View Dialog v8
Use the Materialized View
dialog to define a materialized view. A materialized view is a stored or cached view that contains the result set of a query. Use the REFRESH MATERIALIZED VIEW command to update the content of a materialized view.
The Materialized View
dialog organizes the development of a materialized_view through the following dialog tabs: General
, Definition
, Storage
, Parameter
, and Security
. The SQL
tab displays the SQL code generated by dialog selections.
Use the fields in the General
tab to identify the materialized view:
- Use the
Name
field to add a descriptive name for the materialized view. The name will be displayed in theBrowser
tree control. - Use the drop-down listbox next to
Owner
to select the role that will own the materialized view. - Select the name of the schema in which the materialized view will reside from the drop-down listbox in the
Schema
field. - Store notes about the materialized view in the
Comment
field.
Click the Definition
tab to continue.
Use the text editor field in the Definition
tab to provide the query that will populate the materialized view. Please note that updating the definition of existing materialized view would result in loss of Parameter(Table, Toast), Security(Privileges & Security labels), Indexes and other dependent objects.
Click the Storage
tab to continue.
Use the fields in the Storage
tab to maintain the materialized view:
- Move the
With Data
switch to theYes
position to specify the materialized view should be populated at creation time. If not, the materialized view cannot be queried until you invoke REFRESH MATERIALIZED VIEW. - Use the drop-down listbox next to
Tablespace
to select a location for the materialized view. - Use the
Fill Factor
field to specify a fill factor for the materialized view. The fill factor for a table is a percentage between 10 and 100. 100 (complete packing) is the default.
Click the Parameter
tab to continue.
Use the tabs nested inside the Parameter
tab to specify VACUUM and ANALYZE thresholds; use the Table
tab and the Toast Table
tab to customize values for the table and the associated toast table. To change the default values:
- Move the
Custom auto-vacuum?
switch to theYes
position to perform custom maintenance on the materialized view and to select values in theVacuum table
. TheVacuum Table
provides default values for maintenance operations. - Changing
Autovacuum enabled?
toNot set
will reset autovacuum_enabled.
Click the Security
tab to continue.
Use the Security
tab to assign privileges and define security labels.
Use the Privileges
panel to assign privileges to a role. Click the Add
icon (+) to set privileges for the materialized view:
- Select the name of the role from the drop-down listbox in the
Grantee
field. - Click inside the
Privileges
field. Check the boxes to the left of one or more privileges to grant the selected privilege to the specified user. - The current user, who is the default grantor for granting the privilege, is displayed in the
Grantor
field.
Click the Add
icon (+) to assign additional privileges; to discard a privilege, click the trash icon to the left of the row and confirm deletion in the Delete Row
popup.
Use the Security Labels
panel to define security labels applied to the materialized view. Click the Add
icon (+) to add each security label selection:
- Specify a security label provider in the
Provider
field. The named provider must be loaded and must consent to the proposed labeling operation. - Specify a a security label in the
Security Label
field. The meaning of a given label is at the discretion of the label provider. PostgreSQL places no restrictions on whether or how a label provider must interpret security labels; it merely provides a mechanism for storing them.
Click the Add
icon (+) to assign additional security labels; to discard a security label, click the trash icon to the left of the row and confirm deletion in the Delete Row
popup.
Click the SQL
tab to continue.
Your entries in the Materialized View
dialog generate a SQL command (see an example below). Use the SQL
tab for review; revisit or switch tabs to make any changes to the SQL command.
Example
The following is an example of the sql command generated by user selections in the Materialized View
dialog:
The example shown creates a query named new_hires
that stores the result of the displayed query in the pg_default
tablespace.
- Click the
Info
button (i) to access online help. View context-sensitive help in theTabbed browser
, where a new tab displays the PostgreSQL core documentation. - Click the
Save
button to save work. - Click the
Cancel
button to exit without saving work. - Click the
Reset
button to restore configuration parameters.