我發現這個腳本只通過當前數據庫並且識別未使用的索引，但是我想要遍歷所有數據庫

Question

我發現這個腳本給了你未使用的索引，但是它只能運行在每個數據庫上，它是如何通過所有數據庫運行的在服務器

SELECT o.name , 
     indexname = i.name , 
     i.index_id , 
     reads = user_seeks + user_scans + user_lookups , 
     writes = user_updates , 
     rows = (SELECT SUM(p.rows) 
       FROM sys.partitions p 
       WHERE p.index_id = s.index_id 
         AND s.object_id = p.object_id 
       ) , 
     CASE WHEN s.user_updates < 1 THEN 100 
      ELSE 1.00 * (s.user_seeks + s.user_scans + s.user_lookups) 
       /s.user_updates 
     END AS reads_per_write , 
     'DROP INDEX ' + QUOTENAME(i.name) + ' ON ' + QUOTENAME(c.name) + '.' 
     + QUOTENAME(OBJECT_NAME(s.object_id)) AS 'drop statement' 
FROM sys.dm_db_index_usage_stats s 
     INNER JOIN sys.indexes i ON i.index_id = s.index_id 
            AND s.object_id = i.object_id 
     INNER JOIN sys.objects o ON s.object_id = o.object_id 
     INNER JOIN sys.schemas c ON o.schema_id = c.schema_id 
WHERE OBJECTPROPERTY(s.object_id, 'IsUserTable') = 1 
     AND s.database_id = DB_ID() 
     AND i.type_desc = 'nonclustered' 
     AND i.is_primary_key = 0 
     AND i.is_unique_constraint = 0 
     AND (SELECT SUM(p.rows) 
       FROM  sys.partitions p 
       WHERE  p.index_id = s.index_id 
         AND s.object_id = p.object_id 
      ) > 10000 
ORDER BY reads_per_write ASC; 

Answer 1

有在你的代碼行被限制記錄到當前數據庫：

AND s.database_id = DB_ID() 

您的where子句。如果你刪除它，它會給你所有的數據庫和你有權訪問的對象的統計數據。

您可能還想包括數據庫名，如果你刪除了這一行：

SELECT 
    db_name(database_id) DATABASE_NAME, 
    ...