In some databases, such as PostgreSQL, when a FROM clause is present, what essentially happens is that the target table is joined to the tables mentioned in the fromlist, and each output row of the join represents an update operation for the target table.
22.
However, delete and update operations are more problematic : deletes must leave an empty space, or the rows'offsets would change; the same goes for updates, as the length of the rows becomes shorter; if the update makes the row longer, the row is fragmented.
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The tree rotations used in WAVL tree update operations may make changes that would not be permitted in a red black tree, because they would in effect cause the recoloring of large subtrees of the red black tree rather than making color changes only on a single path in the tree.
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When using rsync on a Fedora Linux system, can I do an identical folder move on both the source and the destination file systems ( i . e . move the same folder from the same original place to the same new place ) with a simple mv command and will rsync be happy with that, or will it mess up some kind of rsync configuration, meaning I would have to first move the folder on the source file system and then do a complete rsync update operation with the " delete files not present on source " option?
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