SQL Server清理索引碎片

DECLARE @SchemeName NVARCHAR(MAX)=N'';
DECLARE @TableName NVARCHAR(MAX)=N'';
DECLARE @IndexName NVARCHAR(MAX)=N'';
DECLARE @avg_fragmentation_in_percent FLOAT=0;
DECLARE @SQL NVARCHAR(MAX)=N'';

DECLARE cur_index CURSOR
LOCAL
FORWARD_ONLY
FAST_FORWARD
READ_ONLY
FOR
SELECT
    '['+s.name+']' AS SchemeName,
    '['+o.name+']' AS TableName,
    '['+i.name+']' AS IndexName,
    MAX(ps.avg_fragmentation_in_percent) AS avg_fragmentation_in_percent
FROM sys.indexes i
INNER JOIN sys.objects o
    ON i.object_id = o.object_id
INNER JOIN sys.schemas s
    ON o.schema_id = s.schema_id
INNER JOIN sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, N'DETAILED') AS ps
    ON ps.object_id = i.object_id
    AND ps.index_id = i.index_id
WHERE ps.avg_fragmentation_in_percent >= 10
AND i.type IN (1, 2)    --1: CLUSTERED, 2: NONCLUSTERED
AND o.type = N'U'        --U: USER_TABLE
AND ps.index_level = 0    --Index leaf-level
GROUP BY    s.name,
            o.name,
            i.name
ORDER BY avg_fragmentation_in_percent DESC;

OPEN cur_index;

FETCH NEXT FROM cur_index
INTO @SchemeName, @TableName, @IndexName, @avg_fragmentation_in_percent;

WHILE(@@FETCH_STATUS=0)
BEGIN
    IF (@avg_fragmentation_in_percent>60)
    BEGIN
        SELECT @SQL = N'ALTER INDEX ' + @IndexName + N' ON ' + @SchemeName + N'.' + @TableName
                        + N' REBUILD PARTITION=ALL WITH (FILLFACTOR = 95, ONLINE = OFF, DATA_COMPRESSION = PAGE );'
    END
    ELSE  --@avg_fragmentation_in_percent between 40 and 60
    BEGIN
        SELECT @SQL = N'ALTER INDEX ' + @IndexName + N' ON ' + @SchemeName + N'.' + @TableName
                        + N' REORGANIZE PARTITION=ALL;'
    END

    EXEC (@SQL)

    FETCH NEXT FROM cur_index
    INTO @SchemeName, @TableName, @IndexName, @avg_fragmentation_in_percent;
END

CLOSE cur_index;
DEALLOCATE cur_index;