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The first example here will back up all the datafiles making up the GL_TABS tablespace, and the backup set piece will be uniquely named using these format specifiers: %d is the database ID %s is the backup set number, which increments with every set created %p is the piece number, starting at 1 for each set The second example nominates one datafile, by number Datafiles can be addressed by name or number The third example uses a wildcard (the percentage character) to identify all archivelogs in a certain directory whose names begin with a certain string

Why should you consider incremental backups There are three major reasons: time, space, and the impact on end users The time for a backup to complete may not be important to the users, but it can be very important to the system administrators Automated tape libraries are very expensive pieces of equipment and may well be used

corner of the Custom Shape selector and choose All to load all custom shapes, including this one) For two of the shapes, I choose Edit | Free Transform and dragged just outside one of the corners to slightly skew them After drawing the shapes you want to use for buttons, click once on one of the shape layers in the Layers palette to make it active Click the Layer Styles button ( ) and select a style to add Figure 8-30 shows how I added two styles to the first maple leaf Outer Glow, and Bevel and Emboss

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for backing up systems other than the Oracle databases If the time required for an RMAN backup can be reduced, there will be savings in the tape library resources needed Even though the default operation of RMAN is to scan the whole datafile when backing it up incrementally in order to identify which blocks have changed, there will still be time savings because in virtually all cases it is the writing to tape that is the bottleneck, not the reading of the files By enabling block change tracking (detailed later in this section), which obviates the need to scan the whole file, the time for the backup can be reduced dramatically The volume of an incremental backup will usually be substantially less than the volume of a full backup As discussed previously, backup sets are always smaller than the source files, or image copies, because they never include empty blocks that have never been written to and can, optionally, be compressed But incremental backups may well be just a small fraction of the size of a full backup set This will reduce the impact on the tape library or the disk resources needed The impact on users is largely dependent on the excessive disk I/O needed for a full backup When block change tracking is enabled, an incremental backup can directly access changed blocks, which will reduce the strain on disk I/O resources substantially Incremental backups can be made with server-managed backups, but not with usermanaged backups As far as an operating system utility is concerned, the granularity of the backup is the datafile: an operating system utility cannot look inside the datafile to extract changed blocks incrementally Incremental backups must always be as backup sets or compressed backup sets It is logically impossible to make an image copy incremental backup, because an incremental backup can never be identical to the source file If it were, it wouldn t be incremental An incremental backup relies on a starting point that contains all blocks: this is known as the incremental level 0 backup Then an incremental level 1 backup will extract all blocks that have changed since the last level 1 backup, or the last level 0 backup if there have been no intervening level 1 backups A cumulative backup will extract all blocks that have changed since the last level 0 backup, irrespective of whether there have been any level 1 backups in the meantime An RMAN command to make a level 0 backup is.

backup as backupset incremental level 0 database;

Wondering how I got the leaf to look cut out of the leaf background in Figure 8-30 Choose Bevel and Emboss from the Layer Styles menu and select Inner Bevel for the Style, Smooth for the Technique, and Down for the Direction The other options can be left at their defaults

This command relies on configured defaults for launching channels, for the number of files to place in each backup set, and to where the backup set will be written The backup set will contain all blocks that have ever been used Many sites will make an incremental level 0 backup every weekend Then a level 1 backup can be made with this command:

backup as backupset incremental level 1 database;

Figure 8-30