Перейти к содержимому

tempdb

Как посмотреть нагрузку на tempdb.

USE MASTER
SELECT cast ((1.0 * stats.io_stall_write_ms / stats.num_of_writes) as int)
FROM sys.dm_io_virtual_file_stats(2,null) as stats
INNER JOIN master.sys.master_files AS files 
ON stats.database_id = files.database_id
AND stats.file_id = files.file_id
WHERE files.type_desc = 'ROWS'

 

Как увеличить количество файлов в TempDB

USE [master]
GO
ALTER DATABASE [tempdb] MODIFY FILE ( NAME = N'tempdev', SIZE = 6144000KB , MAXSIZE = 35840000KB )
GO
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev1', FILENAME = N'S:\tempdb1.mdf' , SIZE = 6144000KB , MAXSIZE = 35840000KB , FILEGROWTH = 10%)
GO
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev2', FILENAME = N'S:\tempdb2.mdf' , SIZE = 6144000KB , MAXSIZE = 35840000KB , FILEGROWTH = 10%)
GO
ALTER DATABASE [tempdb] ADD FILE ( NAME = N'tempdev3', FILENAME = N'S:\tempdb3.mdf' , SIZE = 6144000KB , MAXSIZE = 35840000KB , FILEGROWTH = 10%)
GO
ALTER DATABASE [tempdb] ADD
… Читать далее

Кто использует tempdb

;WITH task_space_usage AS (
    -- SUM alloc/delloc pages
    SELECT session_id,
           request_id,
           SUM(internal_objects_alloc_page_count) AS alloc_pages,
           SUM(internal_objects_dealloc_page_count) AS dealloc_pages
    FROM sys.dm_db_task_space_usage WITH (NOLOCK)
    WHERE session_id <> @@SPID
    GROUP BY session_id, request_id
)
SELECT TSU.session_id,
       TSU.alloc_pages * 1.0 / 128 AS [internal object MB space],
       TSU.dealloc_pages * 1.0 / 128 AS [internal object dealloc MB space],
       EST.text,
       -- Extract statement from sql text
       ISNULL(
           NULLIF(
               SUBSTRING(
                 EST.text, 
                 ERQ.statement_start_offset / 2, 
                 CASE WHEN ERQ.statement_end_offset < ERQ.statement_start_offset 
                  THEN 0 
                 ELSE( ERQ.statement_end_offset - ERQ.statement_start_offset ) / 2 END
               ), ''
           ), EST.text
       ) AS [statement text],
       EQP.query_plan
FROM task_space_usage AS TSU
INNER JOIN sys.dm_exec_requests ERQ WITH
… Читать далее