oracleundo日志

我的Oracle 9i学习日志（14）-- undo数据

Undo segment：图1 用于保存一个进程修改了的数据的旧值。Undo segment头部包含记录了当前事务使用的undo segment信息的一张表。一系列事务只使用一个undo segment存储所有数据。许多并发的事务可以使用同一个undo segment。 Undo segment目的：事务回滚、事务恢复、读一致性。读一致性：图2 每个事务都...

oracle undo表空间与redo日志

undo表空间与redo日志文件在oracle中的作用非常重要，本文重点介绍undo回滚段的作用与特点，同时简单介绍undo与redo的区别和各自己的作用：一.undo中数据的特点： 1。是数据修改前的备份，主要是保证用户的读一致性 2. 在事务修改数据时产生 3。至少保存到事务结束二。undo数据的作用： 1.回滚(rollback)操作 2.实现读一致性与闪回查询 3.从失败的事务中...

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日志服务SLS

日志服务（Log Service，简称LOG/原SLS）是针对实时数据一站式服务，在阿里集团经历大量大数据场景锤炼而成。提供日志类数据采集、消费、投递及查询分析功能，全面提升海量日志处理/分析能力。

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