SQL2008R2的 遍历所有表更新统计信息 和 索引重建

Posted 2020-10-06 tohen

【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