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我发现自己处于继承了数据库的情况，人们抱怨数据库性能。我确定了大约十几个没有聚集索引或没有精心规划的聚集索引的表，其中一些数据量大且经常使用。我实际上正在努力找出为堆实现 CI 的最佳候选者。经过大量阅读后，我仍然不知道该怎么做。我知道这取决于。所以我想给出一张表作为样本，希望得到一些建议。

该表有 122 列。是的，我知道...它包含大约 800 000 行。结构（摘录）：

CREATE TABLE [dbo].[tO](
[ID] [uniqueidentifier] NOT NULL,
[MaID] [uniqueidentifier] NULL,
[OrID] [uniqueidentifier] NOT NULL,
[UsID] [uniqueidentifier] NOT NULL,
[CrUsID] [uniqueidentifier] NOT NULL,
[SuID] [uniqueidentifier] NULL,
[SOID] [uniqueidentifier] NULL,
[DeA1ID] [uniqueidentifier] NULL,
[DeA2ID] [uniqueidentifier] NULL,
[PayID] [uniqueidentifier] NULL,
[MAdID] [uniqueidentifier] NULL,
[ShID] [uniqueidentifier] NULL,
[SessID] [varchar](32) NULL,
[OrUID] [uniqueidentifier] NULL,
[PurOfUID] [uniqueidentifier] NULL,
[AddiUID] [uniqueidentifier] NULL,
[SupUID] [uniqueidentifier] NULL,
[PayTID] [uniqueidentifier] NULL,
[OPSID] [uniqueidentifier] NULL,
[StoRSID] [uniqueidentifier] NULL,
[PayMeID] [uniqueidentifier] NULL,
... …

我有一个这样的表：

CREATE TABLE
  dbo.DiscountBarcodeList
(

  ID int NOT NULL IDENTITY
    CONSTRAINT PK_DiscountBarcodeList
    PRIMARY KEY CLUSTERED

, Discount int NOT NULL
    CONSTRAINT FK_DiscountBarcodeList_Discount
    FOREIGN KEY REFERENCES dbo.Discount (ID)

, CodeNumber int NOT NULL

, AssignedEntity int NULL
    CONSTRAINT FK_DiscountBarcodeList_AssignedEntity
    FOREIGN KEY REFERENCES dbo.Entity (ID)
    ON DELETE SET NULL

, BarcodeID AS
    CONVERT(
      char(10)
    , CAST(Discount AS binary(2)) + CAST(CodeNumber AS binary(3))
    , 2)

, CONSTRAINT UQ_DiscountBarcodeList_DiscountCodeNumber
    UNIQUE NONCLUSTERED 
    (
      Discount  ASC
    , CodeNumber ASC
    )

);

该表将保存预先CodeNumber分配给 s 的 …