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Why might full image copies be faster to implement than an
incremental image copy?
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Answer / s
Full image copy uses tablespace scan to make a copy.
Incremental copy has to access the space map pages to check
if the page has been updated or not before copying the
page.
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Answer / andank
I think the question is wrong. Full image Copies are not
faster than incremental image copies.
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Answer / mehdee
- Incremental image copies are for very large DB2 tables,
and it will not work if you are also loading data into it.
It will work only if this very large DB2 table is being
updated or inserted or deleted. Now that for the backup
purpose we do image copy every day, you can tell that the
daily updated or inserted or deleted rows are no match to
the number of rows that this DB2 table contains. And since
these image copies will be on tapes then you can tell how
faster and more efficient is to do incremental image copies.
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Answer / mahesh vasudevan
It all depends on the size of the tablespace. Full image
copy gives us full recovery consitent state. In case of
Incremental image copy the page needs to be checked against
the condition provided for incremental image copy and in
addition to it just by merging the incremental image copies
we can not get a full recovery of tablespaces...additional
archive log records and prior full image copies are
required. so from the recovery point of view full image copy
would be faster than these incremental image copy.....by the
way the question should be very precise and not be vauge as
it has been posted.
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