Answers below inline:
1 Performance_profiles (inherited from CDB )
Questions:
- do I have to include all other DB (cdbs+PDBS) in IORM plan even if I
dont care about them in terms of I/O performance ?
<-- make sure to setup a DEFAULT share for your other or future databases,
and you can also impose a LIMIT on them. PDBs inherit from the CDBs so you
only deal with them from the DBMS_RESOURCE_MANAGER package and not on
cellcli.
<-- also you can mix Profiles and Inter-DB in a DBPLAN in cases where you
have an older version of the database (mix of 12c and 11204)
ALTER IORMPLAN DBPLAN=(
(name=gold, share=10, limit=100, type=profile), \
(name=silver, share=5, limit=60, type=profile), \
(name=bronze, share=1, limit=20, type=profile), \
(name=demo, share=10, limit=100, type=database), \
(name=default, share=2)
);
** demo is 11204 database with TYPE=database
** the rest of DBs gets a share of 2
2. shares + utilization_limit
same question as above ?
What whould You recommend as a best solution in such way stated problem
(throttling I/O of one PDB only in terms on real hard limit like 80% I/O
capacity of the cell ) .
<-- I would go with SHARES first. Just to keep it simple as possible. And
if the requirement is to really limit the IOs then I would impose the
UTILIZATION_LIMIT
<-- make sure you that you track the CPU breakdown and end percentage
utilization across databases and consumer groups when you impose the SHARES
and the LIMIT/UTILIZATION_LIMIT. it gets pretty hairy when you are dealing
with a lot of databases+PDBs so making a spreadsheet of who gets what will
make the designing easier. that's why I start with SHARES first and impose
UTILIZATION_LIMIT next.
here https://github.com/karlarao/talks/archive/eco_2015.zip there's a
spreadsheet "DBRM IORM Testcase Matrix.xlsx", check out the
"FullModelExample2", "IORM architecture & design", "IORM matrix" sheets.
that will help you with designing the IORM+RM plan.
Bonus question :
In terms of switching into write back cache in rolling fasion , does the 3
cell nodes still allows me to go in rolling mode without crashing the
running instances ?
<-- yes
-Karl
On Sat, Jun 4, 2016 at 8:33 AM, GG <grzegorzof@xxxxxxxxxx> wrote:
Hi,
we are on x5-2 1/8 (3storage + 2 DB nodes) rack, GI + RDBMS is 12.1.0.2 .
Trying to put IO constraints on one of PDBs like 80% hard limit for
getting Cell I/O performance .
As far as I can tell only two options there :
1 Performance_profiles (inherited from CDB )
Questions:
- do I have to include all other DB (cdbs+PDBS) in IORM plan even if I
dont care about them in terms of I/O performance ?
2. shares + utilization_limit
same question as above ?
What whould You recommend as a best solution in such way stated problem
(throttling I/O of one PDB only in terms on real hard limit like 80% I/O
capacity of the cell ) .
Bonus question :
In terms of switching into write back cache in rolling fasion , does the 3
cell nodes still allows me to go in rolling mode without crashing the
running instances ?
Regards
GG
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