sys.dm_fts_fdhosts (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Returns information on the current activity of the filter daemon host or hosts on the server instance.
| Column name | Data type | Description |
|---|---|---|
| fdhost_id | int | ID of the filter daemon host. |
| fdhost_name | nvarchar(120) | Name of filter daemon host. |
| fdhost_process_id | int | Windows process ID of the filter daemon host. |
| fdhost_type | nvarchar(120) | Type of document being processed by the filter daemon host, one of: Single thread Multi-thread Huge document |
| max_thread | int | Maximum number of threads in the filter daemon host. |
| batch_count | int | Number of batches that are being processed in the filter daemon host. |
Permissions
On SQL Server and SQL Managed Instance, requires VIEW SERVER STATE permission.
On SQL Database Basic, S0, and S1 service objectives, and for databases in elastic pools, the server admin account, the Microsoft Entra admin account, or membership in the ##MS_ServerStateReader## server role is required. On all other SQL Database service objectives, either the VIEW DATABASE STATE permission on the database, or membership in the ##MS_ServerStateReader## server role is required.
Permissions for SQL Server 2022 and later
Requires VIEW SERVER PERFORMANCE STATE permission on the server.
Examples
The following example returns the name of the filter daemon host and the maximum number of threads in it. It also monitors how many batches are currently being processed in the filter daemon. This information can be used to diagnose performance.
SELECT fdhost_name, batch_count, max_thread FROM sys.dm_fts_fdhosts;
GO
See Also
Full-Text Search and Semantic Search Dynamic Management Views and Functions (Transact-SQL)
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