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Full-Text Search Related DMVs
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SQL Server 2005 introduces five new full-text related DMVs that help gain insight into the full-text service. All full-text related DMVs are server scoped and require you to have the VIEW SERVER STATE permission on the server in order to access them.
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sys.dm_fts_active_catalogs
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The sys.dm_fts_active_catalogs DMV returns information about the full-text catalogs that have some population activity in progress on the server. One row is returned for each full-text catalog that is active. Catalogs that are up-to-date are not reported by this DMV.
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sys.dm_fts_index_population
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The sys.dm_fts_index_population DMV returns information about the full-text indexes that have some population activity in progress on the server. One row is returned for each full-text index that has population activity in progress. Full-text indexes that are up-todate are not reported by this DMV. The query below can be used to determine the fulltext index s database name, table name, description of the full-text index population, the status, and the start time for all full-text indexes that have some population activity in progress:
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SELECT DB_NAME(database_id) AS database_name, OBJECT_NAME(table_id) AS table_name, population_type_description, status_description, start_time FROM sys.dm_fts_index_population ORDER BY start_time;
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sys.dm_fts_memory_buffers
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The sys.dm_fts_memory_buffers DMV returns information about memory buffers belonging to a specific memory pool that are being used as part of a full-text crawl or a full-text crawl range.
sys.dm_fts_memory_pools
The sys.dm_fts_memory_pools DMV returns information about the memory pools used as part of a full-text crawl or a full-text crawl range.
sys.dm_fts_population_ranges
The sys.dm_fts_population_ranges DMV returns information about the specific ranges related to a full-text index population currently in progress.
Input/Output Related DMVs and Functions
SQL Server 2005 introduces four new Input/Output (I/O)-related DMVs that help gain insight into I/O operations, I/O devices, and database file statistics. All I/O-related DMVs are server scoped and require you to have the VIEW SERVER STATE permission on the server in order to access them.
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Dynamic Management Views
sys.dm_io_backup_tapes
The sys.dm_io_backup_tapes DMV identifies the list of tape devices and the status of mount requests for backups. One row is returned for each device. This DMV can be used to determine details of the devices and is especially useful to determine their current status.
sys.dm_io_cluster_shared_drives
The sys.dm_io_cluster_shared_drives DMV returns the name of the drive that represents an individual disk taking part in the cluster shared disk array if the current server is a clustered server. One row is returned for every single disk of that shared disk array that is used by the clustered SQL Server instance. If the current server instance is not clustered, an empty result set is returned.
sys.dm_io_pending_io_requests
The sys.dm_io_pending_io_requests DMV returns information about pending I/O requests. One row is returned for each pending I/O request in the SQL Server instance.
sys.dm_io_virtual_file_stats
The sys.dm_io_virtual_file_stats DMV takes the database id and file id as input parameters and returns information about the I/O statistics, such as the total number of I/Os performed on a file, for data and log files. For example, the statement below returns the file statistics for the AdventureWorks_Data file (file_id = 1) of the AdventureWorks database (db_id = 6).
SELECT * FROM sys.dm_io_virtual_file_stats(DB_ID(N AdventureWorks ), FILE_IDEX( AdventureWorks_Data ));
You can also use this DMV with NULL specified for the file_id parameter, in which case the I/O statistics for all the files in the specified database are returned:
SELECT * FROM sys.dm_io_virtual_file_stats(6, NULL);
This DMV is useful for identifying the amount of time users have to wait to read or write to a file, as well as which database files, if any, are being used heavily. For example, in the following query if the I/O stalls (io_stall_total_ms) is very high for any of the files, it may signify a disk bottleneck where a high number of reads and writes are occurring on that file. The average I/O waits per read (avg_io_stall_read_ms) and the average I/O waits per write (avg_io_stall_write_ms) can further help determine whether the bottleneck is being caused by read or write activity:
SELECT DB_NAME(database_id) AS database_name, FILE_NAME(file_id) AS filename, num_of_reads, io_stall_read_ms, CAST(io_stall_read_ms/(num_of_reads+1) AS NUMERIC(10,1))
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