Question

我通过SQL Server Tuning Advisor运行了几个示例，它推荐了一个索引，但是我不太确定如何首先用代码实现它们。

public class Exchange
{
    public int Id { get; set; }
    public int ExchangeSetId { get; set; }
    [Required]
    [MaxLength(5)]
    public string AreaCode { get; set; }
    [Required]
    [MaxLength(10)]
    public string BasePrefix { get; set; }
    [MaxLength(100)]
    public string BaseLabel { get; set; }
    [MaxLength(100)]
    public string BaseLocation { get; set; }
    [Required]
    [MaxLength(10)]
    public string DestPrefix { get; set; }
    [MaxLength(100)]
    public string DestLabel { get; set; }
    [MaxLength(100)]
    public string DestLocation { get; set; }
    [MaxLength(100)]
    public string Rule { get; set; }
    public int ClassId { get; set; }
}

Index Tuning Advisor建议如下

SET ANSI_PADDING ON

CREATE NONCLUSTERED INDEX [_dta_index_Exchanges_5_661577395__K3_K4_K7] ON [dbo].[Exchanges]
(
    [AreaCode] ASC,
    [BasePrefix] ASC,
    [DestPrefix] ASC
)WITH (SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF) ON [PRIMARY]

我如何将其添加到我的数据库上下文/模型？

非常感谢任何帮助提示。

Answer 1

由于您使用的是EF 6.1，因此可以使用IndexAttribute。您将其添加到属性：

[Index("IndexName", 1)]
[Required]
[MaxLength(5)]
public string AreaCode { get; set; }    

[Index("IndexName", 2)]
[Required]
[MaxLength(10)]
public string BasePrefix { get; set; }

[Index("IndexName", 3)]
[Required]
[MaxLength(10)]
public string DestPrefix { get; set; }

如果您使用迁移，则需要使用CreateIndex()选项添加它。

如何创建通过调优Advisor，EF6.1 Code First指定的非聚集索引

1 个答案: