Question

我的团队正在开发一个.NET Web应用程序，其数据存储通过SQL Server 2005 Express进行管理。是否可以自动执行数据库中的任务，以便在部署/安装后的一段时间内自动重建某些索引？如果是这样，这是如何实现的？我认为数据库会在tasks之下，但我没有看到它。

Answer 1

当我为数据库提供服务时，此脚本可帮助我删除索引的碎片。也许，它对你有用：

SET NOCOUNT ON;

DECLARE 
      @SQL NVARCHAR(MAX)
    , @IndexName SYSNAME
    , @Output VARCHAR(200)
    , @ServerVersion VARCHAR(100)

SELECT @ServerVersion = CAST(SERVERPROPERTY('Edition') AS VARCHAR(100))

DECLARE cur CURSOR LOCAL READ_ONLY FORWARD_ONLY FOR
    SELECT
        'ALTER INDEX [' + ix.name + N'] ON [' + SCHEMA_NAME(t.[schema_id]) + '].[' + t.name + '] ' + 
        CASE
            WHEN ps.avg_fragmentation_in_percent > 50 THEN
                CASE WHEN @ServerVersion LIKE 'Enterprise%' OR @ServerVersion LIKE 'Developer%' THEN
                  'REBUILD WITH (SORT_IN_TEMPDB = ON, ONLINE = ON ' + CASE WHEN ix.fill_factor > 0 THEN ', FILLFACTOR = ' + CAST(ix.fill_factor AS VARCHAR(3)) ELSE '' END + ') '
                ELSE
                  'REBUILD WITH (SORT_IN_TEMPDB = ON' + CASE WHEN ix.fill_factor > 0 THEN ', FILLFACTOR = ' + CAST(ix.fill_factor AS VARCHAR(3)) ELSE '' END + ') '
            END
            ELSE 'REORGANIZE ' 
        END + 
        CASE
            WHEN ps.partition_number > 1 THEN N' PARTITION = ' + CAST(ps.partition_number AS NVARCHAR(MAX))
            ELSE N''
        END + ';', ix.name
    FROM sys.indexes ix
    JOIN sys.objects t ON t.[object_id] = ix.[object_id]
    JOIN (
        SELECT 
              [object_id]
            , index_id
            , avg_fragmentation_in_percent
            , partition_number
        FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, N'LIMITED')
        WHERE page_count > 100
            AND avg_fragmentation_in_percent > 10
    ) ps ON t.[object_id] = ps.[object_id] AND ix.index_id = ps.index_id

OPEN cur

FETCH NEXT FROM cur INTO @SQL, @IndexName

WHILE @@FETCH_STATUS = 0 BEGIN

    SELECT @Output = CONVERT(NVARCHAR(15), GETDATE(), 114) + ': ' + @IndexName
    RAISERROR(@Output, 0, 1) WITH NOWAIT

    EXEC (@SQL)

    FETCH NEXT FROM cur INTO @SQL, @IndexName

END 

CLOSE cur 
DEALLOCATE cur

在SQL Server Express 2005中自动重建索引

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