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sys.dm_fts_fdhosts (Transact-SQL)

Returns information on the current activity of the filter daemon host or hosts on the server instance.

Applies to: SQL Server (SQL Server 2008 through current version).

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.

Requires VIEW SERVER 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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