【2.以下是更新统计信息】
DECLARE UpdateStatisticsTables CURSOR READ_ONLY FOR
SELECT sst.name,
Schema_name(sst.schema_id)
FROM sys.tables sst
WHERE sst.TYPE = 'U'
DECLARE @name VARCHAR(80),
@schema VARCHAR(40) OPEN UpdateStatisticsTables FETCH NEXT FROM UpdateStatisticsTables INTO @name, @schema WHILE ( @@FETCH_STATUS <> -1 )
BEGIN
IF ( @@FETCH_STATUS <> -2 )
BEGIN
DECLARE @sql NVARCHAR(1024)
SET @sql='UPDATE STATISTICS ' + Quotename(@schema)
+
'.' + Quotename(@name)
EXEC Sp_executesql @sql
END FETCH NEXT FROM UpdateStatisticsTables INTO @name, @schema
END CLOSE UpdateStatisticsTables DEALLOCATE UpdateStatisticsTables GO
UPDATE STATISTICS tblCompany -- 表名
USE tblCompany; -- 数据库名
EXEC sp_updatestats -- 更新所有表统计信息
-------------------------------------------------
【1.以下是索引重建】
摘自: http://www.cnblogs.com/shijun/archive/2012/04/21/2461737.html
项目升级数据库由SQL2000升级到2008R2，今天对数据库表进行碎片扫描，发现有些表碎片较大，于是决定重建索引，联机帮助是最好的老师，将相关脚本摘录备后查。
参考sys.dm_db_index_physical_stats
SELECT
OBJECT_NAME(object_id) as objectname,
object_id AS objectid,
index_id AS indexid,
partition_number AS partitionnum,
avg_fragmentation_in_percent AS fra
FROM sys.dm_db_index_physical_stats (DB_ID(), NULL, NULL , NULL, 'LIMITED')
WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0;
使用脚本中的 sys.dm_db_index_physical_stats 重新生成或重新组织索引 （来源于联机帮助）
SET NOCOUNT ON;
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);
-- 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;
END; -- Close and deallocate the cursor.
CLOSE partitions;
DEALLOCATE partitions; -- Drop the temporary table.
DROP TABLE #work_to_do;
GO