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HomeDatabaseMysql Tutorial了解与全面认识SQL Server 2005数据维护计划

1.关于SQL Server 2005数据维护计划 为了使SQL Server数据库的性能保持在最佳的状态,数据库管理员应该对每一个数据库进行定期的常规维护。这些常规任务包括重建数据库索引、检查数据库完整性,更新索引统计信息,数据库内部一致性检查和备份等。这些常规的

1.关于SQL Server 2005数据维护计划

  为了使SQL Server的性能保持在最佳的状态,管理员应该对每一个数据库进行定期的常规维护。这些常规任务包括重建数据库索引、检查数据库完整性,更新索引统计信息,数据库内部一致性检查和备份等。这些常规的数据库维护任务需要经常重复,而且繁琐耗时,所以往往被管理员忽略。而且,现在的数据库管理员一天到晚都被很多其他的任务压得喘不过气来,根本没有时间去进行日常维护工作。认识到这些问题的存在,SQL Server通过制定维护计划,提供了一个可以自动或手动执行这些日常维护事务的方法。当确定并创建了维护任务后,日常维护就会根据设定的时间段启动,最终会为企业提供更优质更稳定更值得信赖的数据库。

2.SQL Server Service Pack 2数据维护方面的新特性

  SQL Server Service Pack 2有许多改进的新功能和修复设置已经能够支持维护计划的创建功能。其中改进的特性包括:

  维护计划设计器支持在一个维护计划里设置多个子计划,而且每个子计划可以具有创建独立任务计划书的功能。多重计划书是备受期待的特性,能够为不同的日常维护事务设置独立的计划表,例如备份、更新统计信息和执行SQL Server作业等。

  在SQL Server 2005推出的初期,如果企业想要运行维护计划,需要安装SQL Server集成服务(SQL Server Integration Services,SSIS)。不过现在维护计划已经作为一项完全支持的特性整合到了数据库引擎中,所以不再需要启动集成服务了。

  支持多管理环境,并把维护计划信息记录到远程,以适应不断增加的管理维护计划。可以从一台中央主服务器为所有的目标服务器设置维护计划。

  最早出现在SQL Server 2000备受欢迎的“清除维护任务”(Maintenance Cleanup Task)重新回到了维护计划里。这个任务可以删除维护计划执行以后任何残留下来的文件。

  下面列举几个人们预想不到的修复设置,用以改善相关的具体任务:

  SQL Server 2005 Service Pack 2为数据库备份维护计划任务增加了新的备份过期选项。如果您想让备份设置在某个特定日期之后失效,就可以通过设置备份过期选项来实现。SQL Server 2000具有这个特性,不过在SQL Server 2005发布之初被删除了。

  您可以另外指定备份文件夹的位置,数据库备份维护计划任务不会再重新设置这个选项为默认位置。

  过去当您运行备份数据库维护计划任务时,系统可能会错认为您要利用简单恢复模式为系统数据库创建差异和事务日志备份。现在这个缺陷已经修复了。

  历史清除维护计划任务能够将删除文件的时间选项设置成以小时为单位,大大减少了人工操作时间。

  更新统计信息任务提供原先在SQL Server 2000维护计划中包含的完全扫描或根据样本大小扫描的选项。

3. SQL Server维护计划的任务

  一个维护计划可以在设定的时间段里运行全套的SQL Server维护任务,以确保数据库引擎里的关系数据库能够优化运行、执行日常备份和检查异常数据。作为SQL Server数据库引擎的一个特性,可以自动创建数据库维护计划并为这些日常维护设置计划书。一个全面的维护计划包括一下几个主要的任务:

检查数据库完整性   

更新数据库统计信息   

重新组织数据库索引   

进行数据库备份   

清洗数据库历史操作数据   

收缩数据库   

清除维护计划残留文件   

执行SQL Server作业   

清除维护任务

  注意,和SQL Server 2000不同,日志传送不再包括在维护计划的范畴里。可以在SQL Server Management Studio的数据库水平上或者通过TSQL脚本设置日志传送任务。

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