Incremental checkpoint

lilax 2011-09-15 11:19:24
oracle的Incremental checkpoint 增量检查点:
什么条件下触发的?对oracle系统有什么意义?
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lilax 2011-09-17
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SQL> c/ed/ed,
1* select group#,members ,ARCHIVed, status from v$log
SQL> /

GROUP# MEMBERS ARCHIV STATUS
---------- ---------- ------ --------------------------------
1 2 NO INACTIVE
2 2 NO CURRENT
3 2 NO INACTIVE


而且alert.log 每半个小时刷一次Incremental checkpoint :
Thu Sep 15 07:28:47 2011

Incremental checkpoint up to RBA [0xdae.24dda.0], current log tail at RBA [0xdae.24e3d.0]

Thu Sep 15 07:59:14 2011

Incremental checkpoint up to RBA [0xdae.24fe7.0], current log tail at RBA [0xdae.2503a.0]

Thu Sep 15 08:29:43 2011

Incremental checkpoint up to RBA [0xdae.254ff.0], current log tail at RBA [0xdae.2555f.0]

Thu Sep 15 09:00:13 2011

Incremental checkpoint up to RBA [0xdae.256f8.0], current log tail at RBA [0xdae.2583f.0]

Thu Sep 15 09:30:43 2011

Incremental checkpoint up to RBA [0xdae.25c71.0], current log tail at RBA [0xdae.25cd6.0]

这意味着什么?
各位高手能否提供分析的思路?
yixilan 2011-09-15
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关于增量检查点的触发,一般是在ARCHIVELOG模式(归档模式)下使用增量检查点。
非归档模式下,使用增量检查点的话,可能容易丢失数据。
yixilan 2011-09-15
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设置增量检查点,在恢复的时候,速度能快点儿。
因为可以只针对离当前时间最近的检查点进行恢复 ,不需要进行全部的恢复 。
windows中打包tar文件 GUN tar 和在unix中使用tar命令基本上一样的。可以使用tar --help得到帮助的详细信息。 ------------------------------------------- GNU `tar' saves many files together into a single tape or disk archive, and can restore individual files from the archive. Usage: tar [OPTION]... [FILE]... If a long option shows an argument as mandatory, then it is mandatory for the equivalent short option also. Similarly for optional arguments. Main operation mode: -t, --list list the contents of an archive -x, --extract, --get extract files from an archive -c, --create create a new archive -d, --diff, --compare find differences between archive and file system -r, --append append files to the end of an archive -u, --update only append files newer than copy in archive -A, --catenate append tar files to an archive --concatenate same as -A --delete delete from the archive (not on mag tapes!) Operation modifiers: -W, --verify attempt to verify the archive after writing it --remove-files remove files after adding them to the archive -k, --keep-old-files don't overwrite existing files when extracting -U, --unlink-first remove each file prior to extracting over it --recursive-unlink empty hierarchies prior to extracting directory -S, --sparse handle sparse files efficiently -O, --to-stdout extract files to standard output -G, --incremental handle old GNU-format incremental backup -g, --listed-incremental handle new GNU-format incremental backup --ignore-failed-read do not exit with nonzero on unreadable files Handling of file attributes: --owner=NAME force NAME as owner for added files --group=NAME force NAME as group for added files --mode=CHANGES force (symbolic) mode CHANGES for added files --atime-preserve don't change acces

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