02-27-2006
If you create a large filesystem and then load it with data, the data will be distributed more of less evenly across the entire filesystem. If you extend a filesystem, the free space is mostly at the end of the disk. Either one could be better than the other under various circumstances. Suppose you never add any data...the heads never will need to move to the last 25% (or so) of the disk. Suppose a file near the beginning of the disk grows... it will probably be extended into cylinder groups at the end of the disk. Now the heads must move from one end of the disk to the other end of the disk just to read that file. Because this is Oracle, you need an Oracle expert to comment on this.
But even if you simply extend the filesystem.... (Or even if you leave it at the same size!) you absolutely need a backup! What if you try to extend it and the process fails? If the size of this filesystem is so large that you are having trouble making backups, maybe you should not extend it. Maybe it is time for a new filestem instead. And talk to your DBA. You probably need to use some kind of Oracle backup. You cannot just backup the dbf files of a live database.
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