Thursday, August 4, 2016

Table Cleanup

For large databases actively under development, it's not unusual to accrue a fairly large collection of useless and abandoned tables. Here's a query you can run to find them... in this example my cutoff is a year.  The polite thing to do is notify the staff of your intention to archive the large tables (if they so indicate) before you delete them. Script out the definitions of all of those you plan to delete anyhow, just in case somebody suddenly misses them.
DECLARE @DAYSunTouched INT
SET @DAYSunTouched = 365

;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 DBTable.modify_date <= (SELECT sqlserver_start_time FROM sys.dm_os_sys_info)
     and DBTable.modify_date < (getdate() - @DAYSunTouched)
     AND NOT EXISTS (SELECT OBJECT_ID 
              FROM sys.dm_db_index_usage_stats
              WHERE OBJECT_ID = DBTable.object_id )
    )
SELECT DISTINCT TableName , TotalRowCount, CreatedDate , LastModifiedDate
FROM UnUsedTables
ORDER BY TotalRowCount desc

No comments:

Post a Comment