Uniform size value on tablespaces

Question

I have one question about uniform extend.
For example:
I set uniform extend to 16M
I don't set storage parameters for tablespace and table.
My questions is:
For any tables i use one extend 16M ?
If i use table with contains some LOB columns and i declare write this LOB out of table. How many space take one LOB value ? 16M??

Answer 1

Whenever a table containing a LOB column is created, two segments are created to hold the specified LOB column. These segments are of type LOBSEGMENT and LOBINDEX. The LOBINDEX segment is used to access LOB chunks/pages that are stored in the LOBSEGMENT segment.
Important Storage Parameters
This section defines the important storage parameters of a LOB column (or a LOB attribute) - .
?fFor each definition we describe the effects of the parameter, and give recommendations for on how to get better performance and to avoid errors.
CHUNK
Definition
CHUNK is the smallest unit of LOBSEGMENT allocation. It is a multiple of DB_BLOCK_SIZE.
Points to Note
? For example, if the value of CHUNK is 8K and an inserted LOB is only 1K in size, then 1 chunk is allocated and 7K are wasted in that chunk. The CHUNK option does NOT affect in-line LOBs (see the definition in the next section)
? Choose an appropriate chunk size for best performance also to avoid space wastage. The maximum chunk size is 32K.
? The CHUNK parameter cannot be altered.
Recommendation
Choose a chunk size for optimal performance and minimum space wastage. For LOBs that are less than 32K, a chunk size that is 60% (or more) of the LOB size is a good starting point. For LOBs larger than 32K, choose a chunk size equal to the frequent update size.
SJH
OCP DBA