SqlStatement Element for EventClass/IndexSqlSchema (ADF)
Contains a Transact-SQL statement that creates a SQL Server index for the event table.
Syntax
<EventClasses>
<EventClass>
...
<IndexSqlSchema>
<SqlStatement>
Element Characteristics
| Characteristic | Description |
|---|---|
Data type |
string, between 1 and 100,000 characters in length. |
Default value |
None. |
Occurrence |
Optional once or more per IndexSqlSchema element. |
Updates |
Can be added, deleted, and modified when updating the application. |
Element Relationships
| Relationship | Elements |
|---|---|
Parent element |
|
Child elements |
None. |
Remarks
Notification Services automatically creates indexes on the event ID and event batch ID, which improves vacuuming performance.
Important
If you add, delete, or update an indexing SqlStatement element, updating the application deletes and re-creates the event class to which it corresponds. This includes dropping and re-creating the SQL Server tables and indexes used by this event class. Any data existing in the original SQL Server tables is permanently deleted.
Example
The following example shows a SqlStatement element that creates an index on the StockEvents table.
<SqlStatement>
CREATE INDEX StockIndex
ON StockEvents (StockSymbol);
</SqlStatement>
See Also
Reference
Application Definition File Reference
Other Resources
Defining Indexes for a Subscription Class
Updating Instances and Applications