He investigado en la web y encontré algunos de los buenos artículos. En el y escribí la función y el script a continuación que reorganiza, recrea o reconstruye todos los índices en una base de datos.
Primero debe leer this article para comprender por qué no solo recreamos todos los índices.
En segundo lugar, necesitamos una función para crear el script de creación para el índice. Entonces this article puede ayudar. También estoy compartiendo la función de trabajo a continuación.
Último paso haciendo un ciclo while para encontrar y organizar todos los índices en la base de datos. This video es un buen ejemplo para hacer esto.
Función:
create function GetIndexCreateScript(
@index_name nvarchar(100)
)
returns nvarchar(max)
as
begin
declare @Return varchar(max)
SELECT @Return = ' CREATE ' +
CASE WHEN I.is_unique = 1 THEN ' UNIQUE ' ELSE '' END +
I.type_desc COLLATE DATABASE_DEFAULT +' INDEX ' +
I.name + ' ON ' +
Schema_name(T.Schema_id)+'.'+T.name + ' (' +
KeyColumns + ') ' +
ISNULL(' INCLUDE ('+IncludedColumns+') ','') +
ISNULL(' WHERE '+I.Filter_definition,'') + ' WITH (' +
CASE WHEN I.is_padded = 1 THEN ' PAD_INDEX = ON ' ELSE ' PAD_INDEX = OFF ' END + ',' +
'FILLFACTOR = '+CONVERT(CHAR(5),CASE WHEN I.Fill_factor = 0 THEN 100 ELSE I.Fill_factor END) + ',' +
-- default value
'SORT_IN_TEMPDB = OFF ' + ',' +
CASE WHEN I.ignore_dup_key = 1 THEN ' IGNORE_DUP_KEY = ON ' ELSE ' IGNORE_DUP_KEY = OFF ' END + ',' +
CASE WHEN ST.no_recompute = 0 THEN ' STATISTICS_NORECOMPUTE = OFF ' ELSE ' STATISTICS_NORECOMPUTE = ON ' END + ',' +
-- default value
' DROP_EXISTING = ON ' + ',' +
-- default value
' ONLINE = OFF ' + ',' +
CASE WHEN I.allow_row_locks = 1 THEN ' ALLOW_ROW_LOCKS = ON ' ELSE ' ALLOW_ROW_LOCKS = OFF ' END + ',' +
CASE WHEN I.allow_page_locks = 1 THEN ' ALLOW_PAGE_LOCKS = ON ' ELSE ' ALLOW_PAGE_LOCKS = OFF ' END + ') ON [' +
DS.name + ' ] '
FROM sys.indexes I
JOIN sys.tables T ON T.Object_id = I.Object_id
JOIN sys.sysindexes SI ON I.Object_id = SI.id AND I.index_id = SI.indid
JOIN (SELECT * FROM (
SELECT IC2.object_id , IC2.index_id ,
STUFF((SELECT ' , ' + C.name + CASE WHEN MAX(CONVERT(INT,IC1.is_descending_key)) = 1 THEN ' DESC ' ELSE ' ASC ' END
FROM sys.index_columns IC1
JOIN Sys.columns C
ON C.object_id = IC1.object_id
AND C.column_id = IC1.column_id
AND IC1.is_included_column = 0
WHERE IC1.object_id = IC2.object_id
AND IC1.index_id = IC2.index_id
GROUP BY IC1.object_id,C.name,index_id
ORDER BY MAX(IC1.key_ordinal)
FOR XML PATH('')), 1, 2, '') KeyColumns
FROM sys.index_columns IC2
--WHERE IC2.Object_id = object_id('Person.Address') --Comment for all tables
GROUP BY IC2.object_id ,IC2.index_id) tmp3)tmp4
ON I.object_id = tmp4.object_id AND I.Index_id = tmp4.index_id
JOIN sys.stats ST ON ST.object_id = I.object_id AND ST.stats_id = I.index_id
JOIN sys.data_spaces DS ON I.data_space_id=DS.data_space_id
JOIN sys.filegroups FG ON I.data_space_id=FG.data_space_id
LEFT JOIN (SELECT * FROM (
SELECT IC2.object_id , IC2.index_id ,
STUFF((SELECT ' , ' + C.name
FROM sys.index_columns IC1
JOIN Sys.columns C
ON C.object_id = IC1.object_id
AND C.column_id = IC1.column_id
AND IC1.is_included_column = 1
WHERE IC1.object_id = IC2.object_id
AND IC1.index_id = IC2.index_id
GROUP BY IC1.object_id,C.name,index_id
FOR XML PATH('')), 1, 2, '') IncludedColumns
FROM sys.index_columns IC2
--WHERE IC2.Object_id = object_id('Person.Address') --Comment for all tables
GROUP BY IC2.object_id ,IC2.index_id) tmp1
WHERE IncludedColumns IS NOT NULL) tmp2
ON tmp2.object_id = I.object_id AND tmp2.index_id = I.index_id
WHERE I.is_primary_key = 0 AND I.is_unique_constraint = 0
AND I.[name] = @index_name
return @Return
end
SQL para rato:
declare @RebuildIndex Table(
IndexId int identity(1,1),
IndexName varchar(100),
TableSchema varchar(50),
TableName varchar(100),
Fragmentation decimal(18,2)
)
insert into @RebuildIndex (IndexName,TableSchema,TableName,Fragmentation)
SELECT
B.[name] as 'IndexName',
Schema_Name(O.[schema_id]) as 'TableSchema',
OBJECT_NAME(A.[object_id]) as 'TableName',
A.[avg_fragmentation_in_percent] Fragmentation
FROM sys.dm_db_index_physical_stats(db_id(),NULL,NULL,NULL,'LIMITED') A
INNER JOIN sys.indexes B ON A.[object_id] = B.[object_id] and A.index_id = B.index_id
INNER JOIN sys.objects O ON O.[object_id] = B.[object_id]
where B.[name] is not null and B.is_primary_key = 0 AND B.is_unique_constraint = 0 and A.[avg_fragmentation_in_percent] >= 5
--select * from @RebuildIndex
declare @begin int = 1
declare @max int
select @max = Max(IndexId) from @RebuildIndex
declare @IndexName varchar(100), @TableSchema varchar(50), @TableName varchar(100) , @Fragmentation decimal(18,2)
while @begin <= @max
begin
Select @IndexName = IndexName from @RebuildIndex where IndexId = @begin
select @TableSchema = TableSchema from @RebuildIndex where IndexId = @begin
select @TableName = TableName from @RebuildIndex where IndexId = @begin
select @Fragmentation = Fragmentation from @RebuildIndex where IndexId = @begin
declare @sql nvarchar(max)
if @Fragmentation < 31
begin
set @sql = 'ALTER INDEX ['[email protected]+'] ON ['[email protected]+'].['[email protected]+'] REORGANIZE WITH (LOB_COMPACTION = ON)'
print 'Reorganized Index ' + @IndexName + ' for ' + @TableName + ' Fragmentation was ' + convert(nvarchar(18),@Fragmentation)
end
else
begin
set @sql = (select dbo.GetIndexCreateScript(@IndexName))
if(@sql is not null)
begin
print 'Recreated Index ' + @IndexName + ' for ' + @TableName + ' Fragmentation was ' + convert(nvarchar(18),@Fragmentation)
end
else
begin
set @sql = 'ALTER INDEX ['[email protected]+'] ON ['[email protected]+'].['[email protected]+'] REBUILD PARTITION = ALL WITH (ONLINE = ON)'
print 'Rebuilded Index ' + @IndexName + ' for ' + @TableName + ' Fragmentation was ' + convert(nvarchar(18),@Fragmentation)
end
end
execute(@sql)
set @begin = @begin+1
end
¡Es increíble cuántas "autoridades" en línea son totalmente incorrectas y engañosas, es decir, sugiriendo que debe hacer una reducción en una base de datos! –