Quote: if insert into an index without rewriting can write during reads and can use optical disks

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There are two advantages, if a [search] method requires no re-writing of the index structure: @ The … presence of (at most) one writer, readers can … the newly written items, which will not overwrite … This is very important in archival environments with … [ref]. @ The method can work more easily on a WORM …   Google-1   Google-2

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