Ricostruzione indici di Database Adiuto

Per migliorare le prestazioni è utile eseguire nottetempo queste query:

EXEC sp_updatestats

SET NOCOUNT ON;
DECLARE @db_id int;
DECLARE @objectid int;
DECLARE @indexid int;
DECLARE @partitioncount bigint;
DECLARE @schemaname nvarchar(130); 
DECLARE @objectname nvarchar(130); 
DECLARE @indexname nvarchar(130); 
DECLARE @partitionnum bigint;
DECLARE @partitions bigint;
DECLARE @frag float;
DECLARE @command nvarchar(4000); 
SET @db_id = DB_ID();
-- Conditionally select tables and indexes from the sys.dm_db_index_physical_stats function 
-- and convert object and index IDs to names.
SELECT

   object_id AS objectid,
   index_id AS indexid,
   partition_number AS partitionnum,
   avg_fragmentation_in_percent AS frag

INTO #work_to_do
FROM sys.dm_db_index_physical_stats (@db_id, NULL, NULL , NULL, 'LIMITED')
WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;
-- Declare the cursor for the list of partitions to be processed.
DECLARE partitions CURSOR FOR SELECT * FROM #work_to_do;
-- Open the cursor.
OPEN partitions;
-- Loop through the partitions.
WHILE (1=1)

   BEGIN;
       FETCH NEXT
          FROM partitions
          INTO @objectid, @indexid, @partitionnum, @frag;
       IF @@FETCH_STATUS < 0 BREAK;
       SELECT @objectname = QUOTENAME(o.name), @schemaname = QUOTENAME(s.name)
       FROM sys.objects AS o
       JOIN sys.schemas as s ON s.schema_id = o.schema_id
       WHERE o.object_id = @objectid;
       SELECT @indexname = QUOTENAME(name)
       FROM sys.indexes
       WHERE  object_id = @objectid AND index_id = @indexid;
       SELECT @partitioncount = count (*)
       FROM sys.partitions
       WHERE object_id = @objectid AND index_id = @indexid;


-- 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding.

       IF @frag < 30.0
           SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REORGANIZE';
       IF @frag >= 30.0
           SET @command = N'ALTER INDEX ' + @indexname + N' ON ' + @schemaname + N'.' + @objectname + N' REBUILD';
       IF @partitioncount > 1
           SET @command = @command + N' PARTITION=' + CAST(@partitionnum AS nvarchar(10));
       EXEC (@command);
       PRINT N'Executed: ' + @command+ N' ' + cast(@frag as nvarchar(25)) ;
   END;


-- Close and deallocate the cursor.
CLOSE partitions;
DEALLOCATE partitions;
-- Drop the temporary table.
DROP TABLE #work_to_do;
GO