Is tablespace block size and database block size have different meanings

at the time of database creation we can define database block size
which can not be changed afterwards.while in tablespace we can also
define block size which may be different or same as define block size
at the time of database creation.if it is different block size from
the database creation times then what the actual block size using by oracle database.
can any one explain in detail.
Thanks in Advance
Regards

You can't meaningfully name things when there's nothing to compare and contrast them with. If there is no keep or recycle cache, then whilst I can't stop you saying, 'I only have a default cache'... well, you've really just got a cache. By definition, it's the default, because it's the only thing you've got! Saying it's "the default cache" is simply linguistically redundant!
So if you want to say that, when you set db_nk_cache_size, you are creating a 'default cache for nK blocks', be my guest. But since there's no other bits of nk cache floating around the place (of the same value of n, that is) to be used as an alternate, the designation 'default' is pointless.
Of course, at some point, Oracle may introduce keep and recycle caches for non-standard caches, and then the use of the differentiator 'default' becomes meaningful. But not yet it isn't.

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