Status and usage of undo segments and zones in the undo Series

The undo tablespace only does one thing: Save the old value. In AUM, segments are automatically generated, zones are automatically allocated and recycled, and they are not consecutive. Oracle automatically uses the undo segment.

The undo tablespace only does one thing: Save the old value. In AUM, segments are automatically generated, zones are automatically allocated and recycled, and they are not consecutive. Oracle automatically uses the undo segment.

The undo tablespace only does one thing: Save the old value. In AUM, segments are automatically generated, zones are automatically allocated and recycled, and they are not consecutive. Oracle automatically uses the undo segment. In a sense, we only need to pay attention to the size of the undo tablespace.

Query which undo tablespace is activated:

Query the number of data files in the undo tablespace:

Query the number of online segments in the undo tablespace:

How many partitions and blocks are available in the query segment:

Number of blocks in the query area:

From this we can also see that the partition allocation in the undo segment is not continuous.