Relative logical structure of 4K size....

Hi ,
I want to create a block size other than the default one (8K : db_block_size=8192), for example a 4K block size.
How is it called(if any) that parameter representing this logical structure(analogous to db_block_size... db_4k_block_size does not exist) which would stored in the db_4k_cache_size of the sga memory..????
I think there is no way to define it via a parameter... but only when i want to create a tablespace via the command: create tablespace....... blocksize size 4K...
Isn't it correct...???
I use 10g v.2
Thank you...
Sim
Message was edited by:
sgalaxy

Hi Sim,
I want to create a block size other than the default one Why a smaller blocksize?
There are very specific conditions for a shop to benefit from multiple blocksizes:
http://www.dba-oracle.com/t_multiple_blocksizes_summary.htm
Can you justify this proposed change by testing it with a real-world workload?

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user13345475 wrote:
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user8709943 wrote:
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can we upload the an image here . if yes , please tell me how to .
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When Oracle creates a tablespace, or adds a file to a tablespace, it simply asks the OS to create a file of some size. Oracle doesn't know or care how that happens. Oracle doesn't know or care how the OS keeps track of the parts of that file. Oracle doesn't know or care where that file is. Oracle doesn't know or care about OS blocks. All Oracle (or any app) knows is that there exists a file of 10gb. To Oracle, that file is nothing but an address space, beginning at zero and extending for 10gb from there. Whenever Oracle needs data from the file, it will ask the OS for 'x' bytes beginning at offset 'y'. It's up to the OS to figure out what that means. Conversly, the OS doesn't even know about tablespaces. As far as the OS is concerned, the file doesn't even 'belong' to oracle. It just exists, it can be opened/read/written by anyone.
Now it's up to oracle to decide what to do with this file. First, he keeps track of its fully qualified name, its size, and what tablespace he is assigning it to. As part of the tablespace definition, we have a blocksize. This defines how many bytes Oracle will request from the os on any i/o operations. It will be up to the OS to decide what that means.
Next, we create a table. Part of that request will include (explicitly or implicity) an amount of space to reserve in the tablespace. So oracle will create an extent. This simply means that Oracle will make note of the fact that a part of the file beginning with block 'x' and extending for 'y' blocks, will be reserved for exclusive use of that table. Again, these are oracle blocks. The OS neither knows nor cares about any of this.
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Relative logical structure of 4K size....

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