ORACLE全备份和0级增量备份的区别
比较官方的说法
Full
A backup of a datafile that includes every allocated block in the file being backed up. A full backup of a datafile can be an image copy, in which case every data block is backed up. It can also be stored in a backup set, in which case datafile blocks not in use may be skipped, according to rules in Oracle Database Backup and Recovery Reference.
A full backup cannot be part of an incremental backup strategy; that is, it cannot be the parent for a subsequent incremental backup.
Incremental
An incremental backup is either a level 0 backup, which includes every block in the file except blocks compressed out because they have never been used, or a level 1 backup, which includes only those blocks that have been changed since the parent backup was taken.
A level 0 incremental backup is physically identical to a full backup. The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository, so it can be used as the parent for a level 1 backup.
网上搜到的只言片语
The only difference between a level 0 backup and a full backup is that a full backup is never included in an incremental strategy. If no level 0 backup exists when you run a level 1 or higher backup, RMAN makes a level 0 backup automatically to serve as the base.
增量备份0级与全备份都是全备份,但是增量备份0级使用rman备份的话就只备份了used block,而全备份备份了used and unused block
总结一下,二者有两个地方不同
1
全备份不能被用作1级增量备份的基础
2
使用rman备份的时候,全备份备份了used and unused block,0级使用rman备份的话就只备份了used block
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虽然学习Java很久了，自己也连接过一些数据库，比如mysql之类的，如今呢，也学习了一段时间的Oracle，然而呢，今天是我第一次连接Oracle，嘿嘿，应该还不算太迟吧。
今天呢，有点笨拙，大家莫笑！
我这是一个查询例子
首先，� ......
作者:杨大友,余川 测试员:王健
开发工具:Oracle Jdeveloper 10131
软硬件环境:
操作系统linux redhat 3.0 数据库为Oracle 10G 10.0.2
应用服务器为SOA Application Server 10131
开发语言:java
关于体系结构,说多了也让人觉得晕.我直接示例一个做法,至于理解,就慢慢看书吧!
步骤:
1.
创 ......
一:oracle版本介绍:
oracle8
oracle8i 表示此时oracle公司进军互联网,i代表Internet
oracle9i和oracle8i类似
oracle10g包括现在的11g使用了网格计算,g代表grid.
二:oracle10g服务介绍:
OracleDBConsoleorcl 这个是采用浏览器使用的oracle企业管理器 (也就是你安装弹出的那个网页)
OracleOraDb10g_home1iSQ ......
sql语句如下:
select * from userdb40.numservice where ServiceNumber =88880068
and applytime <= to_date('2009-12-26 10:41:44','yyyy-MM-dd HH24:mi:ss')
select to_date('2007-06-28 19:51:20.0','yyyy-MM-dd HH24:mi:ss') from dual; ......
一.rowid简介
rowid就是唯一标志记录物理位置的一个id，在oracle 8版本以前，rowid由file#+block#+row#组成，占用6个bytes的空间，10 bit 的 file# ，22bit 的 block# ，16 bit 的 row#。
从oracle 8开始rowid变成了extend rowid，由data_object_id#+rfile#+block#+row#组成，占用10个bytes的空间， 32bit的 data_object_ ......
