The unit of Allocation ASM vs Tablespace uniform extended

Hi all

I do proof of concept on the migration of our file system based in ASM and RAC databases. The current database has tablespaces with a uniform management of measure of sizes of measure 10 M, 100 M and 512 M.

ASM, I see Oracle documentation that allocates the ASM extended based on the AU from 1 MB. After the sunset of the 20,000 first to what extent, the size of the measure becomes 8 * for then 20000 sets of measure. The increment for a measure of ASM is 64 * AU.
[http://download.oracle.com/docs/cd/B28359_01/server.111/b31107/asmcon.htm#BABCGDBF]

So my question is that how can I have some tablespaces with uniform measurement volume of say 100 M on ASM? If so, will be a more detailed breakdown ASM sizes measure to its default size of AU?

Appreciate the answers on this one!

Kind regards
Naren

Hello
Please don't mix as oracle with the concepts of data scopes used here, see http://download.oracle.com/docs/cd/B28359_01/server.111/b31107/ostmg_gloss.htm#BABFCABI

I guess you know about the concepts of the tablespace extents (you can have one size car or also different size). Here are the intra-space management tablespace. For extensions of data described here, you can compare it with BONE block in normal filesystem, and each award using the ASM consists of one or more data extensions (not extensions of tablespace).

So my question is that how can I have some tablespaces with uniform measurement volume of say 100 M on ASM? If so, will be a more detailed breakdown ASM sizes measure to its default size of AU?

IKE just as you can use the same size of extents for tablespace of 100 MB on a filesystem regular of the BONE 512 bytes block or 2 k or 4 k (or other). In this case, your database will want to write to allocate an extent of 100 MB and then ASM will take over the responsibility than the way in which it will physically store this measure 100 MB on disk group by spreading the Allocation unit. If your this measure when this group of disks, 100 MB is required to be distributed among a number of (set of data extensions) measure 20001 and your ASM allocation unit size is 1 MB, it will allocate extent file ASM 8 * 1 size and total about 13 degrees (13 * 8 = 104 MB) so that your measure of tablespace 100 MB can be stored.

Salman

Published by: Salman Qureshi Sep 20, 2010 11:45

Published by: Salman Qureshi Sep 20, 2010 11:52

Tags: Database

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