Do you have stress queries

Hi Gurus.
We are in the process of testing 10g migration from 9i.
We do not have a real test set up with full volume of data
and load. The Company entrusted with me the smooth
migration from 9i to 10g. In the absense of proper testing
situation, I plan to do the following :
1) Collected tkprof of important sqls found in
v$sql area (highest disk reads)
2) Did explain plan with old stats and production stats
3) Run a long running queries now it is running for the
past 3 days with 16% cpu utilisation
4) Now I seek advise from you is there any standard
sqls that can be used to measure cpu time,elapsed time,
memory usage, i/o waits.
If you provide 4 above, I will open atleast 20 session and take
the system,session statistics and records it. After 10g
migration, I will run the same queries and find the difference. Hope
this is the best I can do to satisfy that load is not abnormal
after migration.
S.D. RAVICHANDRAN
Verizon.

Hi friends
Thank you for your overwhelmed respose. In fact I have
gone through "Effective Oracle by Design" - Thomas Kyte.
I contemplate to do as below :
1) create a big_table (refer page 628 of the book stated)
2) do all sort of dml activities say select, update,insert and
delete
3) take statspack while I am in 9i currently
4) repeat step 2 above
5) take awr report and check.
In fact I expect you to help me in the absence of
real test scenario. I will be doing Bench mark testing
as guided by Tom.
Do you have any other idea, programme of stress
testing can be shared. That is the need of the hour.
I am fully aware of the debacle, bitfalls and I am in the course
of collecting all possible stats esp. tkprof as recommended
by Oracle.
Do reply according to the requirement that will make sense
of this thread and forum.
Thanks
S.D. RAVICHANDRAN
Verizon

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Hi there
I apologise for the length of this question, but there's quite a bit of relevant data. I work in a small typesetting company (<10 employees) and since a HDD failed on an old G4 iMac that we used as a data archive we have learnt that without our data we are nothing. I have now been asked to implement a more reliable back up/recovery system (with minimum downtime) that increases the 'safety' of our customer's data. Rebuilding the archive took days to sort out and because the archive was constantly accessed by our production macs and a couple of PC as well, it hit us hard.
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Mac_fool wrote:
Thanks for your reply!
So, in order to have a RAID visible and accessible by multiple OSs, and to eliminate downtime during rebuilds, a hardware RAID would be necessary.
Well, not quite. When you create a RAID in Disk Utility, the volume only exists as a MacOS X file system. Your Mac can share that volume to any other machines or operating systems.
What I mean by a hardware RAID is some box whose output port is eSATA or USB or some other non-network storage port. On such a device, the logic to create the file system is inside the box. Any machine that is connected to it would see only a single disk. You would still have to ensure that different operating systems could understand whatever file system you were using (HFS+, FAT, NTFS, etc), but that is the same as if you had a non-RAID external drive.
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By 'hardware RAID', do you mean inserting a RAID controller card inside the G5, or a separate storage device, such as a RAIDed NAS-type-thing? Would an ethernet-connected NAS be slower to access than a G5 with internal SATA? Am I right in thinking that those RAID-ready NAS devices cannot be partitioned at all?
I qualified the above to explicity avoid NAS devices just to simplify things.
I'm not familiar with RAID controller cards. My guess is that they are just a cheaper alternative to an external RAID device. It would allow you to plug your own hard drives into the controller card and create the RAID. They would certainly provide higher performance that if the operating system were handling the details.
If you want to have a RAID for data reliablity, you really need an external, self-contained device that has a standard hardware storage port you could plug into any machine. It would look and act just like any other external hard drive. But if a drive failed, a light would flash on the box and you could just pull out the failed hard drive and replace it with a new one. You wouldn't even need to power anything down.
For both RAID controller cards and stand-alone boxes, you may or may not need additional software to partition and format the drive. It depends on the model and manufacturer.
Such a device could also be NAS. In this case, it would have an ethernet interface instead (or in addition). The difference is that such an interface would almost always be slower than a true storage interface like Firewire or USB. Plus, you would usually have to let the box itself handle its partitioning and formatting. Since it is designed to be a networked drive, you don't need another machine to be the server. It is its own server. This is useful in those cases where you don't want/need a dedicated server. The downside is that it probably runs some lowest-common denominator Windows networking for maximum compatibility. Foreign, networked filesystems are always going to be more flaky. Some software may not work. Some OS upgrade may give you hassles.
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Thanks
Namish
3)

1- Nexus used distributed architecture and all the line cards support L3 except the F1 which you need to mix it with M series to get L3 functionality
2- nexus has diffrnet architecure form 65K however new line cards can provide you line speed 10G per port such as F2
3- Nexus uses fabric modules with full mesh channels between these modules and each line card ( provide you much more capacity than 65K for sure )
for packet flow you can find it on cisco.com because it long a bit however in brief:
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between URIBs on supervisor and IP FIB on
I/O modules
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4- the Unicast Forwarding Distribution Manager and L2 forwarding manager are examples of what is hosted in the SUP
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What index types do you suggest when you have...

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select * from A, B, C
where A.a_id = B.a_id
and B.b_id = C.b_id
and C.created_date >sysdate - 1
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used in the query.
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Currently our thinking is to use /*+ ORDERED */ where the from is C, B, A
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Q. Has anybody solved this problem by wrapping the query in a procedure so that you can pin the plan to the procedure where all that differs in the procedure is how the arguments are specified? This seems tedius to me because the procedure would have to take comma separate lists of values whenever you want to pass the values to be used in an IN clause.
Only if you wrap a query that can have optional parameters and N values for any parameter can you manage the plan for that procedure thru a baseline otherwise you simply end up with too many plans to manage because of the different combinations of the size of the IN clauses and the optional parameters that can be specified.
When joining b/w A, B, C etc what indexes should be partitioned?
The typical query uses column values on A to limit the C's associated with the B's that are associated with the A's that match those columns. Those fields on A have global indexes so often when the plan is one where it starts at A first and works it's way down it has to consider far too many rows from A that are unrelated to the eventual partition narrowed to from the C.created_date predicate.
Edited by: steffi on Mar 8, 2011 8:56 PM
Edited by: steffi on Mar 8, 2011 8:57 PM
Edited by: steffi on Mar 8, 2011 8:58 PM

Dear Steffi,
The problem is that the indexes on A and B are all global non partitioned as are the indexes on CWhy are you saying that this is a problem?
What are the definition of your primary index on A, B, and C?
You can eventually add the partition key (created_date) to those primary keys and hence locally partition their corresponding PK indexes
As far as you wrote that there is no relation ship between A.created_date, B.created_date a and C.created_date, then I beleive you can't benefit from the partition wise join because in such case you need to join A,B and C on the same partition key which is created_date
Currently our thinking is to use /*+ ORDERED */ where the from is C, B, AUsing /*+ ORDERED */ is not a guarantee that the Oracle Optimiser will obey this hint.
Use the hint /*+ Leading(C) */ instaedYou know that when you wrap your query into a static PL/SQL procedure you don't have to care then about the use bind variable. It will be used;
that is how static PL/SQL wroks. But when you are using dynamic sql into this PL/SQL procedure you need in this case to take care about using bind variable.
The auto-binding trick which is represented by the cursor_sharing=force (or similar) is not highly recommended as far as there exist side effects like the one that cames to my mind now which is when you have function based indexes based on litteral (for example a function based index like substr(a,2,4)) will be rewritten, when cursor_sharing is set to force, to be substr(a, :SYS_B0, :SYS_B1) which will not mach your original query and will not use the function based index anymore
Best Regards
Mohamed Houri

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If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
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If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry that we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)
If someone answers your question correctly please let other members know by clicking on ’Mark as Accepted Solution’.

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