如何：SQL Server 2008 Express中基于使用情况的性能优化

Question

如果我正在运行SQL Server 2008 Express并使用SQL Server Management Studio Express，如何进行基于使用情况的性能优化？

Answer 1

Does the Dynamic management views exist in SQL Server Express? Try to use sys.dm_exec_query_stats to see if you get any result back. If thats the case, I have some stored procedures you can execute to optimize the performance. I give you an example of one of the procedures, and I can post some others if you want.

CREATE PROCEDURE [ADMIN].[spExecutionTimeStats]
                @DBName                 AS SYSNAME
    AS
     -- +----------------------------------------------------------------------------------------------------------------
      -- ! O b j e c t         : ADMIN.spExecutionTimeStats
      -- ! R e t u r n s       : NONE
      -- ! P a r a m e t e r s : Name                    DataType       Description
      -- +                       ======================= ============== ==================================================
        -- !                                             @dbname                                    sysname 
      -- + ---------------------------------------------------------------------------------------------------------------
      -- ! O b j e c t i v e   : 
      -- + ---------------------------------------------------------------------------------------------------------------
      -- ! S A M P L E S       :
      -- !                                              EXEC ADMIN.spExecutionTimeStats 'DWH'
      -- !                                              EXEC ADMIN.spExecutionTimeStats 'DWH_TOOLKIT'
      -- !                                              EXEC ADMIN.spExecutionTimeStats 'DWH_HISTORY'
      -- + ---------------------------------------------------------------------------------------------------------------
      -- ! H i s t o r y       :
      -- + ---------------------------------------------------------------------------------------------------------------
      -- !                       Date       Who   What
      -- +                       ========== ===== ========================================================================
      -- !                                           2009-09-04 HAWI    Initial version
      -- +----------------------------------------------------------------------------------------------------------------

    --DECLARE @DBName AS SYSNAME='DWH'
    DECLARE @SQL NVARCHAR(MAX)

    SET @SQL='SELECT TOP 100 percent 
                            ''' +@DBName +'''AS DBName,
                OBJECT_SCHEMA_NAME(s.object_id, DB_ID(''' +@DBName +''')) AS Schema_name,
                S.name, 
                D.execution_count,
                D.total_physical_reads,
                D.total_logical_reads,
                d.total_logical_writes,
                d.last_execution_time,
                total_elapsed_time_s=convert(money,d.total_elapsed_time)/1000000,
                max_elapsed_time_s=convert(money,D.max_elapsed_time)/1000000,
                last_elapsed_time_s=convert(money,d.last_elapsed_time)/1000000,
                min_elapsed_time_s=convert(money,D.min_elapsed_time)/1000000,
                avg_time_s=(convert(money,d.total_elapsed_time)/d.execution_count)/1000000,
                d.sql_handle as proc_handle,
                stmnt.*
    FROM ' + @dbname + '.sys.procedures s
                INNER JOIN ' + @dbname + '.sys.dm_exec_procedure_stats d
                             ON s.object_id = d.object_id
                LEFT JOIN 
                                (
                                    SELECT TOP 100 PERCENT
                                    QS.sql_handle,         
                                    ROW_NUMBER() OVER(PARTITION BY qs.sql_handle ORDER BY statement_start_offset) AS statement_no,    
                                    qs.execution_count,
                                    qs.total_physical_reads,
                                    qs.total_logical_reads,
                                    qs.total_logical_writes,
                                    qs.last_execution_time,
                                    sql_total_elapsed_time_s=convert(money,qs.total_elapsed_time)/1000000,
                                    sql_max_elapsed_time_s=convert(money,qs.max_elapsed_time)/1000000,
                                    sql_last_elapsed_time_s=convert(money,qs.last_elapsed_time)/1000000,
                                    sql_min_elapsed_time_s=convert(money,qs.min_elapsed_time)/1000000,
                                    sql_avg_time_s=(convert(money,qs.total_elapsed_time)/qs.execution_count)/1000000,            
                                    SUBSTRING(ST.text, (QS.statement_start_offset/2) + 1,
                                        ((CASE statement_end_offset 
                                            WHEN -1 THEN DATALENGTH(st.text)
                                            ELSE QS.statement_end_offset END 
                                            - QS.statement_start_offset)/2) + 1) AS statement_text
                                    FROM ' + @dbname + '.sys.dm_exec_query_stats AS QS
                                    CROSS APPLY ' + @dbname + '.sys.dm_exec_sql_text(QS.sql_handle) as ST 
                                ) AS stmnt
                            ON d.sql_handle=stmnt.sql_handle
    WHERE 
                convert(money,d.total_elapsed_time)/d.execution_count/1000000>10
                OR
                d.last_elapsed_time > (d.total_elapsed_time/d.execution_count)*1.15
    ORDER BY avg_time_s DESC;'

    PRINT @SQL;
    EXEC sp_executeSQL @SQL;
    GO