LOB segments store LOBs & varrays - Oracle Schema

Q.  Where are the  LOBs and varrays stored?
- Published on 12 Aug 15

a. LOB segments
b. Storage table
c. Both A & B
d. None of the above

ANSWER: LOB segments


  • Nirja Shah   -Posted on 25 Sep 15
    - The first extent of any segment requires at least 2 blocks (if FREELIST GROUPS was 0).

    - That is, the initial extent size of the segment should be at least 2 blocks.

    - LOBs segments are different because they need at least 3 blocks in the first extent.

    - If you try to create a LOB segment in a permanent dictionary managed tablespace with initial = 2 blocks, then it still works because it is possible for segments in permanent dictionary-managed tablespaces to override the default storage setting of the tablespaces.

    - But if uniform locally managed tablespaces or dictionary managed tablespaces of the temporary type, or locally managed temporary tablespaces have an extent size of 2 blocks, then LOB segments cannot be created in these tablespaces.

    - This is because in these tablespace types, extent sizes are fixed and the default storage setting of the tablespaces is not ignored.

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