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Home -> Community -> Mailing Lists -> Oracle-L -> Re[2]: Oracle and NAS storage systems
Hmmn, mutation in digital storage. Maybe that's why programs seem
to have a shelf life?
O> So if you have a very busy varchar2(1) column and a 16K db_block_size, a 16K O> block is written even if only one character in the block has changed? Seems O> like hotspots, er, hot blocks could do a "multiplicity" thing. You know... O> like the more you replicate DNA the more chance for mutation? :-)
O> Been watching too many movies...
R> The WAFL does indeed write to the nearest available inode and relinks R> the inode map. The unlinked inode is immediately available for R> rewrite unless it is a member of a snapshot. Thus while reserving R> unlinked blocks is inefficient from a storage perspective, it is a R> factor you get to control by controlling the snapshots.
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Author: Robert Eskridge
INET: bryny_at_dfweahs.net
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