Performance Issue caused by XmlResults..next().asString();

Hi all,
We there is a simple method to get related documents from Berkeley DB through XQuery, and using XmlResults..next().asString() to get the result. (Note: the result is quite large.)
If call this method in loop, it will become slower and slover, just because of using XmlResults..next().asString(), if only get result XmlResults..next(), not using asString(), there is no performance issue.
Can any one have good suggestions to reslove it?
Many thank.
Jane

Hi,
THis question should be posted on the Berkeley DB XML forum.
Berkeley DB XML
Ron

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Load balancing issue causes performance problems!

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easy:
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Hi,
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A big index by itself won't cause a performance issue. There are other circumstances you should consider for the index.
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~ Madrid
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Interested by performance issue ? Read this ! If you can explain, you're a master Jedi !

This is the question we will try to answer...
What si the bottle neck (hardware) of Adobe Premiere Pro CS6
I used PPBM5 as a benchmark testing template.
All the data and log as been collected using performance counter
First of all, describe my computer...
Operating System
Microsoft Windows 8 Pro 64-bit
CPU
Intel Xeon E5 2687W @ 3.10GHz
Sandy Bridge-EP/EX 32nm Technology
RAM
Corsair Dominator Platinum 64.0 GB DDR3
Motherboard
EVGA Corporation Classified SR-X
Graphics
PNY Nvidia Quadro 6000
EVGA Nvidia GTX 680 // Yes, I created bench stats for both card
Hard Drives
16.0GB Romex RAMDISK (RAID)
556GB LSI MegaRAID 9260-8i SATA3 6GB/s 5 disks with Fastpath Chip Installed (RAID 0)
I have other RAID installed, but not relevant for the present post...
PSU
Cosair 1000 Watts
After many days of tests, I wanna share my results with community and comment them.
CPU Introduction
I tested my cpu and pushed it at maximum speed to understand where is the limit, can I reach this limit and I've logged precisely all result in graph (See pictures 1).
Intro : I tested my E5-XEON 2687W (8 Cores Hyperthread - 16 threads) to know if programs can use the maximum of it. I used Prime 95 to get the result. // I know this seem to be ordinary, but you will understand soon...
The result : Yes, I can get 100% of my CPU with 1 program using 20 threads in parallel. The CPU gives everything it can !
Comment : I put 3 IO (cpu, disk, ram) on the graph of my computer during the test...
(picture 1)
Disk Introduction
I tested my disk and pushed it at maximum speed to understand where is the limit and I've logged precisely all result in graph (See pictures 2).
Intro : I tested my RAID 0 556GB (LSI MegaRAID 9260-8i SATA3 6GB/s 5 disks with Fastpath Chip Installed) to know if I can reach the maximum % disk usage (0% idle Time)
The result : As you can see in picture 2, yes, I can get the max of my drive at ~ 1.2 Gb/sec read/write steady !
Comment : I put 3 IO (cpu, disk, ram) on the graph of my computer during the test to see the impact of transfering many Go of data during ~10 sec...
(picture 2)
Now, I know my limits ! It's time to enter deeper in the subject !
PPBM5 (H.264) Result
I rendered the sequence (H.264) using Adobe Media Encoder.
The result :
My CPU is not used at 100%, the turn around 50%
My Disk is totally idle !
All the process usage are idle except process of (Adobe Media Encoder)
The transfert rate seem to be a wave (up and down). Probably caused by (Encrypt time.... write.... Encrypt time.... write...) // It's ok, ~5Mb/sec during transfert rate !
CPU Power management give 100% of clock to CPU during the encoding process (it's ok, the clock is stable during process).
RAM, more than enough ! 39 Go RAM free after the test ! // Excellent
~65 thread opened by Adobe Media Encoder (Good, thread is the sign that program try to using many cores !)
GPU Load on card seem to be a wave also ! (up and down) ~40% usage of GPU during the process of encoding.
GPU Ram get 1.2Go of RAM (But with GTX 680, no problem and Quadro 6000 with 6 GB RAM, no problem !)
Comment/Question : CPU is free (50%), disks are free (99%), GPU is free (60%), RAM is free (62%), my computer is not pushed at limit during the encoding process. Why ???? Is there some time delay in the encoding process ?
Other : Quadro 6000 & GTX 680 gives the same result !
(picture 3)
PPBM5 (Disk Test) Result (RAID LSI)
I rendered the sequence (Disk Test) using Adobe Media Encoder on my RAID 0 LSI disk.
The result :
My CPU is not used at 100%
My Disk wave and wave again, but far far from the limit !
All the process usage are idle except process of (Adobe Media Encoder)
The transfert rate wave and wave again (up and down). Probably caused by (Buffering time.... write.... Buffering time.... write...) // It's ok, ~375Mb/sec peak during transfert rate ! Easy !
CPU Power management give 100% of clock to CPU during the encoding process (it's ok, the clock is stable during process).
RAM, more than enough ! 40.5 Go RAM free after the test ! // Excellent
~48 thread opened by Adobe Media Encoder (Good, thread is the sign that program try to using many cores !)
GPU Load on card = 0 (This kind of encoding is GPU irrelevant)
GPU Ram get 400Mb of RAM (No usage for encoding)
Comment/Question : CPU is free (65%), disks are free (60%), GPU is free (100%), RAM is free (63%), my computer is not pushed at limit during the encoding process. Why ???? Is there some time delay in the encoding process ?
(picture 4)
PPBM5 (Disk Test) Result (Direct in RAMDrive)
I rendered the same sequence (Disk Test) using Adobe Media Encoder directly in my RamDrive
Comment/Question : Look at the transfert rate under (picture 5). It's exactly the same speed than with my RAID 0 LSI controller. Impossible ! Look in the same picture the transfert rate I can reach with the ramdrive (> 3.0 Gb/sec steady) and I don't go under 30% of disk usage. CPU is idle (70%), Disk is idle (100%), GPU is idle (100%) and RAM is free (63%). // This kind of results let me REALLY confused. It's smell bug and big problem with hardware and IO usage in CS6 !
(picture 5)
PPBM5 (MPEG-DVD) Result
I rendered the sequence (MPEG-DVD) using Adobe Media Encoder.
The result :
My CPU is not used at 100%
My Disk is totally idle !
All the process usage are idle except process of (Adobe Media Encoder)
The transfert rate wave and wave again (up and down). Probably caused by (Encoding time.... write.... Encoding time.... write...) // It's ok, ~2Mb/sec during transfert rate ! Real Joke !
CPU Power management give 100% of clock to CPU during the encoding process (it's ok, the clock is stable during process).
RAM, more than enough ! 40 Go RAM free after the test ! // Excellent
~80 thread opened by Adobe Media Encoder (Lot of thread, but it's ok in multi-thread apps!)
GPU Load on card = 100 (This use the maximum of my GPU)
GPU Ram get 1Gb of RAM
Comment/Question : CPU is free (70%), disks are free (98%), GPU is loaded (MAX), RAM is free (63%), my computer is pushed at limit during the encoding process for GPU only. Now, for this kind of encoding, the speed limit is affected by the slower IO (Video Card GPU)
Other : Quadro 6000 is slower than GTX 680 for this kind of encoding (~20 s slower than GTX).
(picture 6)
Encoding single clip FULL HD AVCHD to H.264 Result (Premiere Pro CS6)
You can look the result in the picture.
Comment/Question : CPU is free (55%), disks are free (99%), GPU is free (90%), RAM is free (65%), my computer is not pushed at limit during the encoding process. Why ???? Adobe Premiere seem to have some bug with thread management. My hardware is idle ! I understand AVCHD can be very difficult to decode, but where is the waste ? My computer want, but the software not !
(picture 7)
Render composition using 3D Raytracer in After Effects CS6
You can look the result in the picture.
Comment : GPU seems to be the bottle neck when using After Effects. CPU is free (99%), Disks are free (98%), Memory is free (60%) and it depend of the setting and type of project.
Other : Quadro 6000 & GTX 680 gives the same result in time for rendering the composition.
(picture 8)
Conclusion
There is nothing you can do (I thing) with CS6 to get better performance actually. GTX 680 is the best (Consumer grade card) and the Quadro 6000 is the best (Profressional card). Both of card give really similar result (I will probably return my GTX 680 since I not really get any better performance). I not used Tesla card with my Quadro, but actually, both, Premiere Pro & After Effects doesn't use multi GPU. I tried to used both card together (GTX & Quadro), but After Effects gives priority to the slower card (In this case, the GTX 680)
Premiere Pro, I'm speechless ! Premiere Pro is not able to get max performance of my computer. Not just 10% or 20%, but average 60%. I'm a programmor, multi-threadling apps are difficult to manage and I can understand Adobe's programmor. But actually, if anybody have comment about this post, tricks or any kind of solution, you can comment this post. It's seem to be a bug...
Thank you.

Patrick,
I can't explain everything, but let me give you some background as I understand it.
The first issue is that CS6 has a far less efficient internal buffering or caching system than CS5/5.5. That is why the MPEG encoding in CS6 is roughly 2-3 times slower than the same test with CS5. There is some 'under-the-hood' processing going on that causes this significant performance loss.
The second issue is that AME does not handle regular memory and inter-process memory very well. I have described this here: Latest News
As to your test results, there are some other noteworthy things to mention. 3D Ray tracing in AE is not very good in using all CUDA cores. In fact it is lousy, it only uses very few cores and the threading is pretty bad and does not use the video card's capabilities effectively. Whether that is a driver issue with nVidia or an Adobe issue, I don't know, but whichever way you turn it, the end result is disappointing.
The overhead AME carries in our tests is something we are looking into and the next test will only use direct export and no longer the AME queue, to avoid some of the problems you saw. That entails other problems for us, since we lose the capability to check encoding logs, but a solution is in the works.
You see very low GPU usage during the H.264 test, since there are only very few accelerated parts in the timeline, in contrast to the MPEG2-DVD test, where there is rescaling going on and that is CUDA accelerated. The disk I/O test suffers from the problems mentioned above and is the reason that my own Disk I/O results are only 33 seconds with the current test, but when I extend the duration of that timeline to 3 hours, the direct export method gives me 22 seconds, although the amount of data to be written, 37,092 MB has increased threefold. An effective write speed of 1,686 MB/s.
There are a number of performance issues with CS6 that Adobe is aware of, but whether they can be solved and in what time, I haven't the faintest idea.
Just my $ 0.02

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•Sliders still have a bit of jerkiness to them in develop module. Also sometimes when I grab a scrubby slider to move it, it highlights the field as if I want to enter a number. Wish this would not happen. If I want to enter the number, a single click should do it in the field. If I grab the scrubby slider, it should just activate the scrubby slider.
• Keyword suggestions take much longer to generate. In 3.6 as fast as I'd add keywords, the relevant suggestions would pop up right away.
• When zooming into 100%, it seems to be reasonably fast to render, but I've noticed sometimes it just shows the blurred semi-rendered version without actually rendering 1:1. Even unzooming and rezooming doesn't work. Only solution is to go to another image and then back to the original image and that seems to kick it into gear and re-initialize the rendering engine.
Overall I love the features and new process 2012, I'm just disappointed in the performance. Especially now that I'm trying to edit a large job. I really wish the program could be optimized to work as well as 3.6 did and I hope once the final version of 4.1 is released (hopefully soon) we will see an overall performance boost. I have removed ver 3.6 from my system so that's too much of a hassle to go back and not an option, plus I've gotten used to the new process and like it too much to go back.
From the posts I've read it seems others are experiencing this as well, as well as colleagues I've spoken to. It seems to be across platforms and regardless of computer specs (as long as someone's using a fairly updated and capable computer)
Thanks for working on a performance boost Adobe and getting ver. 4.1 dialed in and releasing a final version.

Cannot reproduce on Win7 64Bit (LR4.1RC).
What OS
what external editor
what image format is the original
what image format is passed to the external editor
Beat

DB Performance issue

Hi DB Gurus,
Our application is inserting 60-70K records in a table in each transaction. When multiple sessions are open on this table user face performance issues like application response is too slow.
Regarding this table:
1.Size = 56424 Mbytes!
2.Count = 188,858,094 rows!
3.Years of data stored = 4 years
4.Average growth = 10 million records per month, 120 million each year! (has grown 60 million since end of June 2007)
5.Storage params = 110 extents, Initial=40960, Next=524288000, Min Extents=1, Max Extents=505
6.There are 14 indexes on this table all of which are in use.
7. Data is inserted through bulk insert
8. DB: Oracle 10g
Sheer size of this table (56G) and its rate of growth may be the culprits behind performance issue. But to ascertain that, we need to dig out more facts so that we can decide conclusively how to mail this issue.
So my questions are:
1. What other facts can be collected to find out the root cause of bad performance?
2. Looking at given statistics, is there a way to resolve the performance issue - by using table partition or archiving or some other better way is there?
We've already though of dropping some indexes but it looks difficult since they are used in reports based on this table (along with other tables)
3. Any guess what else can be causing this issue?
4. How many records per session can be inserted in a table? Is there any limitation?
Thanks in advance!!

Run STATSPACK and check what it says are the issues. Try and find the particular INSERT statement in the list of all SQL. Look at all the sections of the report, including block contention, which may show you are waiting for data blocks or index blocks, etc, or even things like latch contention too. Make sure you run it when the INSERT is happening during one of your busy periods.
Given that you are using Oracle 10g, I assume you are using all the automatic settings now:
o Local Tablespace Management
o Automatic Segment Space Management
o Automatic Undo Management
If not, you should be. Prior to all this, Oracle always inserted into the last block in a table, which could become a bottleneck point. And space allocation of new blocks was also a problem. When these settings were introduced it alleviated most of these problems, and meant that Oracle could scale far better on such INSERT intensive workloads. If you are not using these for some reason or other, then you need to look at the number of FREELISTS you have on the table, and the setting of INITRANS.
Also, how many columns does this table have? And how big is an average row. And what is your block size? You can get these from the data dictionary:
select count (*) from user_tab_columns where table_name = '<tablename>' ;
select avg_row_len from user_tables where table_name = '<tablename>' ;
show parameter db_block_size
Replace <tablename> with the name of your table, in uppercase.
I ask because a very large row in a small data block will always fill the block quickly and cause new blocks to be allocated. If so, you may just have to live with this.
And I would be suspicious about all 14 indexes being needed. Are they all single column indexes, or do you have any multi-column indexes? Do any of them share the same leading columns? Again, if you need all 14 indexes, then you must suffer the overhead of maintaining these indexes. But unless you have something like 50 columns in this table, I would guess that there is some overlap between these indexes.
John

Performance issue entering monitor etc

Dear Sirs,
Our system currently feels quite slow. When entering the monitor for a load, or managing a cube the system it takes a while.
In SM50 I can see it reads at table (sequential) på RSMONIPTAB (which contains 1 millions records).
SAP help.sap.com describes a process u201CArchivation of Request Administration Datau201D, which might help? Look below. However, I do not like the paragraph marked in bold. What kind of features do they reference to.
http://help.sap.com/saphelp_nw04s/helpdata/en/42/ead8d7b55e1bd2e10000000a11466f/frameset.htm
Archiving request administration data allows you to store the administration and log information for a request in an archive. In BI, tables store the totals records that the system requires so that the request is not set to red because information is missing. This function allows you to limit the size of the administration and log tables, RSDONE und RSMON. This improves performance for actions performed for the request and in the affected InfoProviders and saves memory space in the database without affecting the status set by the system.
For certain functions and processes that access requests, you have to reload request administration data to the BI administration and log tables.
Any hints on the issue in general; performance issue with monitor, please let me know.
Best regards,
Jørgen

Guess note below describes gives more info about situation. However, not with a clear solution :=)
SAP Note 694895 - Performance and tables RSMON, RSDONE
Note Language: English Version: 5 Validity: Valid Since 29.11.2005
Summary
Symptom
Tables RSMON* (for example, table RSMONMESS) and tables RS*DONE (for
example, table RSSELDONE) continuously increase in size in the BW system
with each request that is created.
Currently there is no option to reduce these tables.
Do not delete any entries from these tables. If you did, this would have
the following consequences:
When you carry out the next check for the requests for which you have
deleted records from these tables, the check will not run properly.
The status of the relevant requests turns RED in the monitor, and also in
all affected data targets that contain the request.
The affected request and all subsequent requests are no longer visible in
the reporting - all queries on the affected data targets then only display
old data.
Numerous dumps will occur in various situations.
You will not be able to repair the errors caused by the deletion.
More Terms
RSMONMESS; RSSELDONE; Performance; RSMON; RSDONE;
Cause and Prerequisites
This is caused by a program error.
Solution
In the next BW release (BI in SAP NetWeaver 2004s - that is BW 7.0), you
will be able to archive entries from the RSMON* and RS*DONE tables using a
request archiving process that archives the administrative information for
requests.
After archiving, these tables are then considerably reduced in size.
Until then, there is unfortunately no option for reducing the tables.

Windows 7 Enterprise login performance issue RODC site

Hi,
We are deploying windows 7 enterprise to all our computers in our domain and we didn't have any performance issue on any site with Full DC. Now we are facing a problem with our multiple sites with RODC but only with new deployed windows 7 (WinXp is not having
this slow login problem). The problem is very strange. Whatever a user start a session on a desktop or laptop with Windows 7, wireless or cabled, when the user enter his credential and press the "validation arrow" next to the password nothing happen
(well it look like nothing happen). After 5 to 10 minutes at this logon screen, we finally see the logon process start applying domain policy, preparing the desktop etc etc and this take less then 10 seconds but remember, we just wait 5 to 10 minutes until
the computer process the "process my log in" botton. Sometime, the CTRL+ALT+DEL screen come back and when we press them we got nothing, we have to wait for the "logon" to occur before doing anything else with the computer.
I've looked to many way to solve this but for now nothing worked.

Hi,
Sorry for my dilatory reply. How about using a same user account to log on XP computer? Will it logon fast?
Have you tried to add a user account into Allowed RODC Password Replication Group for test? This problem probably caused by the password authentication problem In RODC host.
For further investigation, you can try to use Network Manitor at RODC host to capture package of client machine authenticate to a domain controller.
The blog about Understanding "Read Only Domain Controller" authentication
may be helpful.
After the above steps, We can narrow the cause of this problem.
If problem persists, this problem may caused by Windows 7 Client performance. Generally speaking, the problem like this most probably caused by sercurity application problem. You can try to disable or uninstall security application temportaily for test.
If there is any progress, please feel free let us know.
Roger Lu
TechNet Community Support

Creating datafile performance issues

Hi guys,
I´m using a oracle rac 10g with 3 nodes, and i needed do create a new datafile in production environment, then i had some performance issues, do you guys have any idea what the cause of this ?
CREATE TABLESPACE "TBS_TDE_CMS_DATA"
DATAFILE
'+RDATA' SIZE 1000M REUSE AUTOEXTEND ON NEXT 1000M MAXSIZE 30000M
LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;
Any hint would be helpful.
thanks.

BrunoSales wrote:
Hi guys,
I´m using a oracle rac 10g with 3 nodes, and i needed do create a new datafile in production environment, then i had some performance issues, do you guys have any idea what the cause of this ?
CREATE TABLESPACE "TBS_TDE_CMS_DATA"
DATAFILE
'+RDATA' SIZE 1000M REUSE AUTOEXTEND ON NEXT 1000M MAXSIZE 30000M
LOGGING EXTENT MANAGEMENT LOCAL SEGMENT SPACE MANAGEMENT AUTO;
Any hint would be helpful.
thanks.why are creating 1GB of initial extent? I think is too big. Remember whenever you add datafile to database, oracle first formats the complete datafile. So doing this can have performance issue as it depends upon the datafile size. check if you face any issue in I/O or check if there are any spikes in I/O.
You can try adding a datafile with default values and check how much time it take

Performance Issue with sql query

Hi,
My db is 10.2.0.5 with RAC on ASM, Cluster ware version 10.2.0.5.
With bsoa table as
SQL> desc bsoa;
Name                                      Null?    Type
ID                                        NOT NULL NUMBER
LOGIN_TIME                                         DATE
LOGOUT_TIME                                        DATE
SUCCESSFUL_IND                                     VARCHAR2(1)
WORK_STATION_NAME                                  VARCHAR2(80)
OS_USER                                            VARCHAR2(30)
USER_NAME                                 NOT NULL VARCHAR2(30)
FORM_ID                                            NUMBER
AUDIT_TRAIL_NO                                     NUMBER
CREATED_BY                                         VARCHAR2(30)
CREATION_DATE                                      DATE
LAST_UPDATED_BY                                    VARCHAR2(30)
LAST_UPDATE_DATE                                   DATE
SITE_NO                                            NUMBER
SESSION_ID                                         NUMBER(8)
The query
UPDATE BSOA SET LOGOUT_TIME =SYSDATE WHERE SYS_CONTEXT('USERENV', 'SESSIONID') = SESSION_ID
Is taking a lot of time to execute and in AWR reports also it is on top in
1. SQL Order by elapsed time
2. SQL order by reads
3. SQL order by gets
So i am trying a way to solve the performance issue as the application is slow specially during login and logout time.
I understand that the function in the where condition cause to do FTS, but i can not think what other parts to look at.
Also:
SQL> SELECT COUNT(1) FROM BSOA;
COUNT(1)
   7800373
The explain plan for "UPDATE BSOA SET LOGOUT_TIME =SYSDATE WHERE SYS_CONTEXT('USERENV', 'SESSIONID') = SESSION_ID" is
{code}
PLAN_TABLE_OUTPUT
Plan hash value: 1184960901
| Id | Operation          | Name               | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | UPDATE STATEMENT   |                    |     1 |    26 | 18748   (3)| 00:03:45 |
|   1 | UPDATE            | BSOA |       |       |            |          |
|* 2 |   TABLE ACCESS FULL| BSOA |     1 |    26 | 18748   (3)| 00:03:45 |
Predicate Information (identified by operation id):
   2 - filter("SESSION_ID"=TO_NUMBER(SYS_CONTEXT('USERENV','SESSIONID')))
{code}

Hi,
There are also triggers before update and AUDITS on this table.
CREATE OR REPLACE TRIGGER B2.TRIGGER1
BEFORE UPDATE
ON B2.BSOA REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
:NEW.LAST_UPDATED_BY   := USER    ;
:NEW.LAST_UPDATE_DATE := SYSDATE ;
END;
CREATE OR REPLACE TRIGGER B2.TRIGGER2
BEFORE INSERT
ON B2.BSOA REFERENCING OLD AS OLD NEW AS NEW
FOR EACH ROW
:NEW.CREATED_BY        := USER ;
:NEW.CREATION_DATE     := SYSDATE ;
:NEW.LAST_UPDATED_BY   := USER    ;
:NEW.LAST_UPDATE_DATE := SYSDATE ;
END;
And also there is an audit on this table
AUDIT UPDATE ON B2.BSOA BY ACCESS WHENEVER SUCCESSFUL;
AUDIT UPDATE ON B2.BSOA BY ACCESS WHENEVER NOT SUCCESSFUL;
And the sessionid column in BSOA has height balanced histogram.
When i create an index i get the following error. As i am on 10g I can't use DDL_LOCK_TIMEOUT . I may have to wait for next down time.
SQL> CREATE INDEX B2.BSOA_SESSID_I ON B2.BSOA(SESSION_ID) TABLESPACE B2 COMPUTE STATISTICS;
CREATE INDEX B2.BSOA_SESSID_I ON B2.BSOA(SESSION_ID) TABLESPACE B2 COMPUTE STATISTICS
ERROR at line 1:
ORA-00054: resource busy and acquire with NOWAIT specified
Thanks

Performance Issue caused by XmlResults..next().asString();

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