| title | sys.dm_fts_fdhosts (Transact-SQL) | ||||
|---|---|---|---|---|---|
| description | sys.dm_fts_fdhosts (Transact-SQL) | ||||
| author | rwestMSFT | ||||
| ms.author | randolphwest | ||||
| ms.date | 02/27/2023 | ||||
| ms.service | sql | ||||
| ms.subservice | system-objects | ||||
| ms.topic | reference | ||||
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| monikerRange | =azuresqldb-current || >=sql-server-2016 || >=sql-server-linux-2017 || =azuresqldb-mi-current || =fabric-sqldb |
[!INCLUDE SQL Server Azure SQL Database Azure SQL Managed Instance FabricSQLDB]
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. |
On [!INCLUDEssNoVersion_md] 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.
Requires VIEW SERVER PERFORMANCE STATE permission on the server.
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
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