从视图填充或创建表的SQL Server过程 - 性能问题

Question

我编写了以下代码来填充/创建数据库中所有相应视图（t_）的表（v_）。我使用游标转换了以前的脚本以提高运行速度。还有什么我可以做的让这个表现更好吗？

感谢任何帮助。

请参阅我的代码：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

ALTER PROCEDURE [dbo].[P_populate_tables_from_views] 
    @dropTables BIT
AS
    DECLARE @viewName NVARCHAR(100);
    DECLARE @formattedTableName NVARCHAR(100);
    DECLARE @dropTableSql NVARCHAR(MAX);

    DECLARE @viewId int

    SET @viewId = (SELECT MIN(object_id) FROM sys.views)

    WHILE @viewId IS NOT NULL
    BEGIN
        SET @viewName = (SELECT name FROM sys.views WHERE object_id = @viewId)

        PRINT 'Time: ' + CONVERT(varchar, SYSDATETIME(), 121)
        PRINT('Processing ' + @viewName)

        SET @formattedTableName = REPLACE(@viewName,'v_','t_');

        IF @dropTables = 1
        BEGIN
            SET @dropTableSql = 'IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '''+@formattedTableName+''')) DROP TABLE '+@formattedTableName
            EXEC (@dropTableSql);
        END

        IF (EXISTS (SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = @formattedTableName))
        BEGIN
            EXEC('TRUNCATE TABLE '+@formattedTableName)
            EXEC('INSERT INTO '+@formattedTableName +' SELECT * FROM '+ @viewName) 
        END
        ELSE
        BEGIN
            EXEC ('SELECT * INTO '+@formattedTableName+' FROM '+@viewName);
        END

        SET @viewId = (SELECT MIN(object_id) 
                       FROM sys.views 
                       WHERE object_id > @viewId)
END

Answer 1

1. 将@sql声明为nvarchar（max）=''
2. SELECT @sql = @sql +'
3. IF EXISTS（SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ['+ REPLACE（name，'v _'，'t_'）+']）
4. BEGIN
5. TRUNCATE TABLE ['+ REPLACE（name，'v _'，'t_'）+']
6. INSERT INTO'+ REPLACE（name，'v _'，'t_'）+'SELECT * FROM'+ name +'
7. END
8. ELSE
9. SELECT * INTO'+ REPLACE（name，'v _'，'t_'）+'FROM'+ name + char（10）
10. FROM sys.views
11. print @sql
12. EXEC（@sql）