Question

有没有办法找出数据最后输入表格的时间？我正试图在我的数据库中找到过时的表，并想知道是否有一个我可以运行的简单脚本？

Answer 1

您可以尝试检查查询sys.dm_db_index_usage_stats动态管理视图的结果，如下所示：

SELECT *
FROM sys.dm_db_index_usage_stats
WHERE [database_id] = DB_ID() 
    AND [object_id] = OBJECT_ID('TableName')

这将返回表格上索引的last_user_seek，扫描和更新日期等内容。

但是，请注意，重新启动服务器时会重置动态管理视图的统计信息。服务器运行的时间越长，如果记录显示没有活动，您就越有信心。

我个人也会检查所有源代码以检查对相关表的引用，并搜索所有sprocs / UDF以获取引用（您可以使用SQL Search from Red Gate执行此操作 - 它是免费的）

Answer 2

如果有人在数据库中查找所有未使用的表（标题的请求多于问题正文），this guy有一个很好的查询来引入数据库中所有未更改的表。在这种情况下，“未更改”是sys.dm_db_index_usage_stats中没有条目的任何表（再次，与AdaTheDev的答案一样，仅在上次sql server重新启动后）。

SELECT OBJECTNAME = Object_name(I.object_id), 
       INDEXNAME = I.name, 
       I.index_id 
FROM   sys.indexes AS I 
       INNER JOIN sys.objects AS O 
               ON I.object_id = O.object_id 
WHERE  Objectproperty(O.object_id, 'IsUserTable') = 1 
       AND I.index_id NOT IN (SELECT S.index_id 
                              FROM   sys.dm_db_index_usage_stats AS S 
                              WHERE  S.object_id = I.object_id 
                                     AND I.index_id = S.index_id 
                                     AND database_id = Db_id(Db_name())) 
ORDER  BY objectname, 
          I.index_id, 
          indexname ASC

Answer 3

上次查询：

-- Create CTE for the unused tables, which are the tables from the sys.all_objects and 
-- not in the sys.dm_db_index_usage_stats table

; with UnUsedTables (TableName , TotalRowCount, CreatedDate , LastModifiedDate ) 
AS ( 
  SELECT DBTable.name AS TableName
     ,PS.row_count AS TotalRowCount
     ,DBTable.create_date AS CreatedDate
     ,DBTable.modify_date AS LastModifiedDate
  FROM sys.all_objects  DBTable 
     JOIN sys.dm_db_partition_stats PS ON OBJECT_NAME(PS.object_id)=DBTable.name
  WHERE DBTable.type ='U' 
     AND NOT EXISTS (SELECT OBJECT_ID  
                     FROM sys.dm_db_index_usage_stats
                     WHERE OBJECT_ID = DBTable.object_id )
)
-- Select data from the CTE
SELECT TableName , TotalRowCount, CreatedDate , LastModifiedDate 
FROM UnUsedTables
ORDER BY TotalRowCount ASC

上次更新时间：

With Unused_Tables (Table_Name, Row_Count, Created_Date, Last_Modified_Date,
Last_User_Lookup, Last_User_Scan, Last_User_Seek, Last_User_Update) 
AS ( 
  SELECT AO.name AS Table_Name
     ,PS.row_count AS Row_Count
     ,AO.create_date AS Created_Date
     ,AO.modify_date AS Last_Modified_Date
     ,ius.last_user_lookup AS Last_User_Lookup
     ,ius.last_user_scan AS Last_User_Scan
     ,ius.last_user_seek AS Last_User_Seek
     ,ius.last_user_update AS Last_User_Update
  FROM sys.all_objects  AO 
     JOIN sys.dm_db_partition_stats PS ON OBJECT_NAME(PS.object_id)=AO.name
     LEFT JOIN sys.dm_db_index_usage_stats ius ON OBJECT_NAME(ius.object_id)=AO.name
  WHERE AO.type ='U' 
  
)
SELECT  * FROM Unused_Tables
Where ISNULL(Last_User_Lookup,'1900-01-01')<DATEADD(month, -1, GETDATE()) AND 
      ISNULL(Last_User_Scan,'1900-01-01')<DATEADD(month, -1, GETDATE()) AND
      ISNULL(Last_User_Seek,'1900-01-01')<DATEADD(month, -1, GETDATE()) AND 
      ISNULL(Last_User_Update,'1900-01-01')<DATEADD(month, -1, GETDATE())
ORDER BY Row_Count DESC

Answer 4

如果这对您的应用程序和/或公司很重要，并且表格设计正确，那么每个表都应该有一个名为“LastModifiedTime”的列。您可以查询此表以确定哪些表已过时。

如何在SQL Server中查找未使用的表

4 个答案: