SQL 服务器触发器性能

Question

我正在使用 SQL Server 2005。我有这个 table 任务文件：

和 table 个任务：

当一个文件的所有任务都处于状态3（已完成）时，相关文件的状态必须为4（已完成）。

我尝试在任务 table 上添加触发器来解决这个问题，但我对性能不满意，因为任务 table 的更新每秒可能有几次，而且我获取数据库连接问题。

我写的触发器是

CREATE TRIGGER [dbo].[tr_set_file_to_worked] 
ON [dbo].[PROD_TASK]
AFTER UPDATE
AS 
BEGIN
    SET NOCOUNT ON;

    ;WITH ToUpdate AS
    (
        SELECT
            pf.id_file, pt.id_state, COUNT(*) AS tasks
        FROM
            prod_task pt
        LEFT JOIN 
            prod_file pf ON (pt.ID_FILE = pf.ID_FILE)
        GROUP BY 
            pf.id_file, pt.id_state
    );

    UPDATE pf
    SET pf.ID_STATE = 4
    FROM prod_file pf
    INNER JOIN inserted ins ON (pf.Id_file = ins.id_file)
                            AND NOT EXISTS (SELECT *
                                            FROM ToUpdate tu 
                                            INNER JOIN inserted ins ON (tu.id_file = ins.ID_FILE)
                                            WHERE tu.id_state <> 3);
END

此查询平均需要 200 毫秒。

使用 Squirrel 解决方案需要 20 毫秒。

UPDATE pf
SET    ID_STATE = 4
FROM   inserted i           
       INNER JOIN PROD_FILE pf ON pt.ID_FILE = pf.ID
       LEFT JOIN PROD_TASK pt ON (i.ID_FILE = pt.ID_FILE AND pt.ID_STATE <> 3)
WHERE  i.ID_STATE = 3 AND pt.ID_TASK is NULL

Answer 1

希望我理解正确

UPDATE pf
SET    ID_STATE = 4
FROM   inserted i
       INNER JOIN PROD_TASK pt ON i.ID_FILE = pt.ID_FILE
       INNER JOIN PROD_FILE pf ON pt.ID_FILE = pf.ID
WHERE  i.ID_STATE = 3
AND    NOT EXISTS
       (
            SELECT *
            FROM   PROD_TASK x
            WHERE  x.ID_FILE = i.ID_FILE
            AND    x.ID_STATE <> 3
       )

SQL 服务器触发器性能

SQL Server trigger performance

sql-server

sql-server-2005

triggers