When you create a materialized view, its refresh type is manual, but you can change it to immediate. You can also change an immediate view back to manual again.
Prérequis
You must be the owner, or have both the CREATE ANY MATERIALIZED VIEW and DROP ANY MATERIALIZED VIEW system privileges, or both the CREATE ANY OBJECT and DROP ANY OBJECT system privileges. If you do not have a required privilege but want to alter a materialized view to be immediate (ALTER MATERIALIZED VIEW...IMMEDIATE REFRESH), you must own the view and all the tables it references.
To change from manual to immediate, the view must be in an uninitialized state (contain no data). If the view was just created and has not yet been refreshed, it is uninitialized. If the materialized view has data in it, you must execute a TRUNCATE statement on it to return it to an uninitialized state before you can change it to immediate. The materialized view must also have a unique index, and must conform to the restrictions required for an immediate view.
An immediate view can be changed to manual at any time without any additional steps other than changing its refresh type.
TaskIn Sybase Central, use the SQL Anywhere 16 plug-in to connect to the database.
In the left pane, double-click Views.
Right-click the materialized view and click Properties.
In the Refresh Type field, choose one of the following options:
| Option | Action |
|---|---|
| Change a manual view to an immediate view | Immediate |
| Change an immediate view to a manual view | Manual |
Click OK.
See also |
Discuter à propos de cette page dans DocCommentXchange.
|
Copyright © 2013, SAP AG ou société affiliée SAP - SAP Sybase SQL Anywhere 16.0 |