Question

在这里，我处于同一个泥潭中，也许很多人都曾经/过去过。 Teradata 14.1具有对象使用功能。
这个专栏是1 env。结果是零，因为我们在前一段时间升级了，但在另一个（QA /测试）环境中升级了。它有价值。

DBC.DBQLRuleTbl | TimeCreated

sel TimeCreated from DBC.DBQLRuleTbl where DBQLRuleTbl.UserID in ( sel OU.DatabaseId from DBC.ObjectUsage OU )

1 env中没有行。我想要做的是找出未使用的统计数据。我们过去几个月才开始使用OU。因此，当我使用此查询查找UNUSED统计信息时，我得到最后一个col -1，因为RuleTbl没有任何与OU表匹配的内容。

        SELECT DBC.DBase.DatabaseName AS DatabaseName
          ,DBC.TVM.TVMName        AS TableName
          ,COALESCE(DBC.StatsTbl.StatsName
                   ,DBC.StatsTbl.ExpressionList
                   ,'SUMMARY')    AS StatName
          ,CURRENT_DATE - CAST(DBC.StatsTbl.CreateTimeStamp AS DATE) AS StatAge
          ,CASE
           WHEN DatabaseName = 'DBC'
           THEN -2  -- Logging Not Applicable
           WHEN DBC.StatsTbl.StatsType IN ('B', 'M')
           THEN -2  -- Logging Not Applicable on Temp tables (base and materialized)
           WHEN DBC.DBQLRuleTbl.TimeCreated IS NULL
           THEN -1  -- Logging Not Enabled
           WHEN DBC.DBQLRuleTbl.TimeCreated > DBC.StatsTbl.CreateTimeStamp
           THEN CURRENT_DATE - CAST(DBC.DBQLRuleTbl.TimeCreated AS DATE)
           ELSE CURRENT_DATE - CAST(DBC.StatsTbl.CreateTimeStamp AS DATE)
     END AS DaysStatLogged 
    FROM   DBC.StatsTbl LEFT JOIN  DBC.DBQLRuleTbl
               ON DBC.StatsTbl.DatabaseId = DBC.DBQLRuleTbl.UserID
              AND DBQLRuleTbl.ExtraField5 = 'T'   

          ,DBC.Dbase
          ,DBC.TVM      
    WHERE DBC.StatsTbl.DatabaseId = DBC.DBASE.DatabaseId
      AND DBC.StatsTbl.ObjectId   = DBC.TVM.TVMId
      AND NOT EXISTS (SELECT '1' FROM DBC.ObjectUsage OU
                      WHERE OU.UsageType  = 'STA'
                        AND OU.DatabaseId = DBC.StatsTbl.DatabaseId
                        AND OU.ObjectId   = DBC.StatsTbl.ObjectId
                        AND OU.FieldId    = DBC.StatsTbl.StatsId
                        AND CURRENT_DATE - CAST(OU.LastAccessTimeStamp AS DATE) < N
                     )
      --AND DaysStatLogged > N 

    /* I had to mute this criteria because  otherwise there will be no o/p for reasons mentioned above */

      AND DBC.StatsTbl.StatsId <> 0  
-- Do not qualify table-level SUMMARY statistics as unused
-- May get implicitly used but not recorded as used
and StatAge < N 

/* StatAge < N .I am not sure if this filter should be there- I added it to catch those stats that are as old OU. We dunno if stats older than OU ever got used before OU started */
                                     and databasename in  ( sel child    from  dbc.children where parent ='FINDB'  group by      1 )
    ORDER BY 1, 2, 3;

我试图获得FINDB级联的JST THE STATS而不是系统范围的统计数据。鉴于我的规则表搞砸了 - 上面的查询是否最接近于适合账单
“找到我自从OU开启以来尚未使用的FINDB下所有数据库的统计数据”

Answer 1

查询可能正常，因为它基于Identifying Used, Unused and Missing Statistics，只需检查它是否返回您想要的内容。

但你在TD14.10和Viewpoint中的统计管理器做了所有这些（以及更多），如果你不使用它，你应该开始{{3} }

新的Teradata Stats功能。对一些事情感到困惑

1 个答案: