Size of the log file Archive
Redlogfile size is 16 MB and generating the archivelog file size is approximately 10 Mb. what could be the reason?Oracle Version: 10.2.0.4
OS: Windows
Published by: Deccan charger 19 April 2010 23:31
First of all:
a redo log contains a lot of things necessary for instance etc. recovery an archived log is used only for the restorations - he didn't need all the stuff that is in a redo log, so when written CRA the archiving log that he does not write all knowledge, all that is required for restores
Second:
Archive logs is created with dimensions smaller, irregular, as the original redo logs. Why? [388627.1 ID]
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Last updated 2 June 2007 Type status MODERATE HOWTO
In this Document
Goal
Solution
References
--------------------------------------------------------------------------------
This document is available to you through process of rapid visibility (RaV) of the Oracle's Support and therefore was not subject to an independent technical review.
Applies to:
Oracle Server - Enterprise Edition - Version: 8.1.7.4 to 11.1
Information in this document applies to any platform.
Goal
Archive logs is created with dimensions smaller, irregular, as the original redo logs.
Commands like:
ALTER SYSTEM SWITCH LOGFILE
or
ALTER SYSTEM ARCHIVE LOG...
are not used to generate archives or change the log file. Thus, there is no parameter ARCHIVE_LAG_TARGET set.
What else could cause this behaviour?
Solution
From:
Bug: 5450861: NEWSPAPERS ARCHIVE IS GENERATED with one SIZE SMALLER THAN THE REDO LOG FILES
the explanation of this situation has 2 main reasons:
1 archiving logs do not have to be in the same size. This was decided very long ago, when blank padding archiving logs stopped for a very good reason - in order to save disk space.
2. the log command does not exist when a redo log file is 100% full. There is an internal algorithm that determines when to switch journal. It also has a very good reason - do the command of newspaper at the last moment may incur performance problems (for various reasons, outside the scope of this note).
So, after that newspaper ordering occurs the archivers are only copying the information from the redo log files. As recovery logs are not 100% full after the command to log and archive logs are empty not filled after the copy operation is complete, this results in unequal files smaller than the original of redo log files.
This is very apparent for very low (less than 10 MB) log files; as a result, produced 2.5 MB archive logs of 5 MB recovery logs are very visible.
Just note that currently, the default log files are 100 MB in size. If the archives log files would be between 98 and 100 MB person would notice.
The main concern that one must have for newspapers of archives files is a possible corruption. This can be easily verified by attempting a resumption of testing. When it's ok, the size of the log archive uneven should be of no interest, as is expected.
Tags: Database
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