索引搜索而不是索引扫描的条件不是 null

Question

我有下面的查询...

SELECT Compra_ID
FROM [Fart_Compras_dss_tracking]
WHERE [local_create_peer_timestamp] IS NOT NULL

CREATE TABLE [DataSync].[Fart_Compras_dss_tracking]
(
    [COMPRA_ID] [int] NOT NULL,
    [Sucursal_ID] [int] NOT NULL,
    [update_scope_local_id] [int] NULL,
    [scope_update_peer_key] [int] NULL,
    [scope_update_peer_timestamp] [bigint] NULL,
    [local_update_peer_key] [int] NOT NULL,
    [local_update_peer_timestamp] [timestamp] NOT NULL,
    [create_scope_local_id] [int] NULL,
    [scope_create_peer_key] [int] NULL,
    [scope_create_peer_timestamp] [bigint] NULL,
    [local_create_peer_key] [int] NOT NULL,
    [local_create_peer_timestamp] [bigint] NOT NULL,
    [sync_row_is_tombstone] [int] NOT NULL,
    [last_change_datetime] [datetime] NULL,

    CONSTRAINT [PK_DataSync.Fart_Compras_dss_tracking] 
        PRIMARY KEY CLUSTERED ([COMPRA_ID] ASC, [Sucursal_ID] ASC)
                WITH (STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
GO

CREATE NONCLUSTERED INDEX [Idx_Text_4] 
ON [DataSync].[Fart_Compras_dss_tracking] ([COMPRA_ID] ASC,
                                           [Sucursal_ID] ASC,
                                           [local_create_peer_timestamp] ASC,
                                           [local_update_peer_timestamp] ASC)
INCLUDE ([update_scope_local_id], [scope_update_peer_key],
         [scope_update_peer_timestamp], [local_update_peer_key],
         [create_scope_local_id], [scope_create_peer_key],
         [scope_create_peer_timestamp], [local_create_peer_key],
         [sync_row_is_tombstone], [last_change_datetime]) 
WHERE ([local_create_peer_timestamp] IS NOT NULL)
WITH (STATISTICS_NORECOMPUTE = OFF, DROP_EXISTING = OFF, ONLINE = OFF) ON [PRIMARY]
GO

执行计划可在下面的链接中找到...

https://www.brentozar.com/pastetheplan/?id=SkZbOe8zi

当我查看显示 INDEX SCAN 的执行计划时，我尝试创建不同的索引/过滤索引，但我无法看到 INDEX SEEK 甚至强制使用我的索引。

像这样的IS NOT NULL条件需要什么索引来提高性能？

Answer 1

您向我们展示的索引不适合优化您的过滤条件。 （它看起来确实比你的 PK 聚簇索引扫描得更快，但仍然需要扫描。）

该索引将有助于提高性能。

CREATE INDEX tstamp ON Fart_Compras_dss_tracking 
      (local_create_peer_timestamp);

您的 WHERE 过滤器可以随机访问它。 您仍然会看到索引范围扫描。