增强SQL Server 2012中WHILE循环的性能

问题描述

我为sql Server 2012创建了以下脚本，希望对它的性能增强提出任何建议。

DECLARE @dbname varchar(50)
DECLARE @dbuser varchar(50)
DECLARE @statement nvarchar(max)
DECLARE @db_cursor CURSOR

SET @dbname = 'AdventureWorks2012'

SET @db_cursor = CURSOR FOR
SELECT name
FROM sys.server_principals
WHERE TYPE = 'U' and name like '%DESKTOP-B2341N%'

OPEN @db_cursor

FETCH NEXT FROM @db_cursor INTO @dbuser

WHILE @@FETCH_STATUS = 0
BEGIN
    /* This statement will be executed to grant the privilege read only */
    SELECT @statement = 'USE ['+@dbname+']; ' + 'ALTER ROLE [db_owner] DROP MEMBER ['+@dbuser+'];' +
                        'USE ['+@dbname+']; ' + 'ALTER ROLE [db_datareader] ADD MEMBER ['+@dbuser+'];'

    EXEC (@statement)

    FETCH NEXT FROM @db_cursor INTO @dbuser
END

解决方法

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performance sql-server while-loop