Incremental Export using EXP Command
Hi all,
I am trying to get incremental backup using oracle 9i "Exp" command. But this backup is being taken full of table data where changes made. Actually incremental backup should take a backup only the data last changes made.
Please help me, how can I take the real incremental backup using exp command.
Thanks
Khalil
should take a backup only the data last changes made.In order to be able to do that, Oracle would have to track rows that have changed since the last export. Think of a database with few hundred to a few thousand tables and tables with tens to tens-of-million rows.
In a table, a single column in a single row may have been updated.
However, in another table 40 columns in 3million rows may have been updated since the last export.
In another table, some rows might be deleted. (how would "incremental" compute the difference between "there were 1000 rows yesterday, there are 942 rows today")
In a fourth table, 3million rows have been inserted since the last export.
Can you conceive of the scale of "tracking" that Oracle would have to do if you want "only the last changes" to be exported ? Next, how would you "merge" data from two exports when you import them -- e.g. if the non-primarykey columns have been updated ; or primarykey has been updated ; or the table has no primarykey ?
The only way an "Incremental" change can be identified is by tracking if any change (whether 1 columm in 1 row or all the columns in all the rows) has been made to the table since the last export. If a single byte has been changed in the table, the whole table will be exported.
Are you sure you were able to use Incremental Export in 9i ? Incremental Export is documented in 8.1.7 but hasn't appeared in the 9.2 documentation.
The 8.1.7 documentation says "+An incremental Export backs up only tables that have changed since the last incremental, cumulative, or complete Export. An incremental Export exports the table definition and all its data, *not just the changed rows*. Typically, you perform incremental Exports more often than cumulative or complete Exports.+ "
Oracle had announced the end of Error Correction Support for the Incremental Export effective 31-Dec-1999. It ended Extended Assistance Support 31-Dec-2002. See Oracle Note#170483.1 on the support site.
Hemant K Chitale
http://hemantoracledba.blogspot.com
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=================================================================
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