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sys.dm_fts_fdhosts (Transact-SQL)


THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)noAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

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 nameData typeDescription
fdhost_idintID of the filter daemon host.
fdhost_namenvarchar(120)Name of filter daemon host.
fdhost_process_idintWindows process ID of the filter daemon host.
fdhost_typenvarchar(120)Type of document being processed by the filter daemon host, one of:

Single thread


Huge document
max_threadintMaximum number of threads in the filter daemon host.
batch_countintNumber 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;  

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