Expansion of round-robin fragmentation
Posted in 2008
Topics: Storage & Space Management, Versions, Editions & End-of-Life
Hi all,
we have to change the fragmentation strategy of a fragmented table. The
present strategy is round-robin with 5 fragments. Because the limit of
16777216 pages per fragment of the table in question will be reached soon we
consider to change the round-robin strategy to e.g. 10 fragments.
>From the syntax guide:
To add another dbspace, use the ADD clause, as in this example:
ALTER FRAGMENT ON TABLE book ADD dbsp3;
Has anybody expierence with it? Is the change a matter of seconds or of
hours?
IDS 9.40FC9W2
TIA, Reinhard
Hello Reinhard,
a bit thin ice; however i think you're in trouble. adding a fragment
will not change the fact that
5 fragments are almost full which will cause errors when
inserting(thin ice!!)
so i would setup a whole new strategy and probably use expression if
possible.
if setup new then use the high perfloader to unload and load; express
mode if possible; maybe noconversion job...
eq create new table with correct frag strategy setup dev array of
pipes
unload from <source table with 5 frags> to array of pipes
load from array of pipes insert into new.
Last time i did something simular (back in 2000 ) a reload this way
did 100 GB an hour on a 20 cpu 20GB mem sun.
Since machines and disks etc are faster, it should be faster!!!
Superboer.
On 21 aug, 10:13, "Habichtsberg, Reinhard" <RHabichtsb...@arz-
emmendingen.de> wrote:
> Hi all,
>
> we have to change the fragmentation strategy of a fragmented table. The
> present strategy is round-robin with 5 fragments. Because the limit of
> 16777216 pages per fragment of the table in question will be reached soon we
> consider to change the round-robin strategy to e.g. 10 fragments.
>
> >From the syntax guide:
>
> To add another dbspace, use the ADD clause, as in this example:
> ALTER FRAGMENT ON TABLE book ADD dbsp3;>
> Has anybody expierence with it? Is the change a matter of seconds or of
> hours?
>
> IDS 9.40FC9W2
>
> TIA, Reinhard