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Recognized by its name Background shown in italics in the Layers palette Always exists at the bottom of the Layers palette because layers can t be placed under the background Only one Background layer can exist in a single image file Its opacity is set at 100% and can t be changed Can t be grouped with other layers Similar to the actual canvas of a physical painting Can be changed into a normal layer by double-clicking it Is transparent until content is added to it Has editable opacity and fill levels Can be grouped and/or linked with other layers Can be moved above or below other layers in the Layers palette Can be changed into a Background layer (if one doesn t already exist) by choosing Layer | New | Background From Layer Accepts layer styles and adjustment layers Can be renamed Must be associated with a particular layer Can be linked to the associated layer Can be moved with the associated layer Has editable opacity and fill levels Can be associated with another layer Can be grouped and/or linked with other layers Has editable opacity levels Can be moved above and below other layers in the Layers palette Affects all layers underneath it Can be associated with another layer Can be grouped and/or linked with other layers Has editable opacity levels Can be moved above and below other layers in the Layers palette Does not affect the layers underneath it Must be associated with a particular layer Can be any of the following: Drop Shadow, Inner Shadow, Outer Glow, Inner Glow, Bevel and Emboss, Satin, Color Overlay, Gradient Overlay, Pattern Overlay, Stroke Accepts only vector-based text content Can be grouped and/or linked with other layers Has editable opacity and fill levels Can be moved above or below other layers in the Layers palette Accepts layer styles and adjustment layers Must be rasterized (changed from vector-based to bitmap) before accepting certain filters and effects.

The clause defining what to back up can be anything: a datafile, a tablespace, the whole database, incremental, compressed, encrypted, and so on It can be directed to either tape or disk However, usually, the only sensible backup target is a full backup of the whole database, and it will probably be directed through a tape channel to a tape library The date expression can be an actual date or a calculation An example is

backup database as compressed backup set keep until time 'sysdate + 90' restore point quarterly_backup ;

This command will write out a compressed backup, which will be considered obsolete (and therefore deletable) after 90 days If the database is open at the time, the relevant archivelogs will be included

Layer (normal; also called an image layer)

A number of views populated from the target database controlfile can be used to report on RMAN s backups By querying these, you can develop your own reports, rather than relying on RMAN s LIST command

One row for each file that has been backed up, which may be a datafile, the spfile, the controlfile, or an archive log Also, one row for each piece that RMAN has created The column FILE_TYPE distinguishes which type of file the row refers to One row per backup set One row per backup piece One row for each archived log that has been backed up One row for each backup that has been made of the spfile One row for backup of a datafile Names of SBT devices that have been linked to RMAN One row for every configuration setting, excluding all those on default

v$backup_set v$backup_piece v$backup_redolog v$backup_spfile v$backup_datafile v$backup_device v$rman_configuration

Table 6-1

Join columns in the various views will let you construct comprehensive reports on what has been backed up, where the backups are located, and the size and type of each backup

The information used by the RMAN commands REPORT and LIST, and the information displayed in the dynamic performance views, is drawn from the RMAN repository: data stored in the controlfile of the target database It says nothing about reality whether the backup files actually still exist To confirm that the backups do exist, use the CROSSCHECK command For example:

Contains a vector-based path Can be grouped and/or linked with other layers Has editable opacity and fill levels Can be moved above or below other layers in the Layers palette Accepts layer styles and adjustment layers Contains several layers grouped together Contains a bottom layer (which is underlined in the Layers palette) that masks the contents of the grouped layers above it