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Warning (2): Trying to access array offset on value of type null [APP/Controller/NewsController.php, line 3613]

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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 163 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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Notice (8): SplFileObject::fwrite() [<a href='https://secure.php.net/splfileobject.fwrite'>splfileobject.fwrite</a>]: Write of 106 bytes failed with errno=28 No space left on device [CORE/src/Cache/Engine/FileEngine.php, line 141]

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SQLServer误区30日谈第28天有关大容量事务日志恢复模式的误区 - 站长搜索
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SQLServer误区30日谈第28天有关大容量事务日志恢复模式的误区

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2022-09-23 16:58:54 转载来源: 网络整理/侵权必删

误区#28:有关大容量事务日志恢复模式的几个误区28a)常见的DML操作可以被“最小记录日志”    不是。在大容量事务日志恢复模式下只有一小部分批量操作可以被“最小记录日志”,这类操作的列表可以在OperationsThatCanBeMinimallyLogged找到

误区 #28:有关大容量事务日志恢复模式的几个误区

28 a)常见的DML操作可以被“最小记录日志”
    不是。在大容量事务日志恢复模式下只有一小部分批量操作可以被“最小记录日志”,这类操作的列表可以在Operations That Can Be Minimally Logged找到。这是适合SQL Server 2008的列表,对于不同的SQL Server版本,请确保查看正确的列表。

28 b)使用大容量事务日志恢复模式不会影响灾难恢复
    首先,在上次事务日志备份之后进行了“最小记录日志”操作,并且由于灾难导致数据文件受损,那么在这种模式下无法备份尾端日志,因此如果灾难发生则自上次日志备份依赖所有的事务就会丢失。
    除此之外,在大容量事务日志恢复模式中如果包含了“最小记录日志”操作,那么这个日志备份就不能用于还原到特定时间点。因此,这个日志备份要不就全部还原,要不就一点都不还原,也就是,只能还原到以下几个时间点:

  • 日志备份开始之前的时间点
  • 日志备份结束时的时间点
  • 日志备份结束之后的时间点
    总之你不能将数据库还原到日志涵盖范围之内的时间点。

28 c)使用大容量事务日志恢复模式会减少日志备份的大小
    不。
    大容量事务日志备份时虽然备份的日志会大大减少,但是为了能够用于还原,还需根据位图将大容量事务日志备份所修改的数据区(Extent)全部备份。这也就意味着大容量事务日志恢复模式和完整恢复模式进行日志备份时所备份的内容几乎差不多。

标签: 误区 SQLServer 30日 28天 有关 大容量 事务 日志 恢复


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