Database Reference
In-Depth Information
Figure 3-2.
Oracle normally only writes change vectors to the redo stream
Now, consider what happens during a hot backup. For a hot backup, before you copy the data files associated
with a tablespace, you must first alter the tablespace into backup mode. While in this mode, before Oracle modifies a
block, the entire block is copied to the redo stream. Any subsequent changes to the block only require that the normal
redo-change vectors be written to the redo stream. This is illustrated in Figure
3-3
.
Figure 3-3.
Entire blocks are written to the redo stream
