IMPACT WHEN INCREASE THE ATRIBUTTE WILDCARD_MAXTERMS

In some queries the output was
ORA-29902: error in executing ODCIIndexStart() routine
ORA-20000: interMedia Text error:
DRG-51030: wildcard query expansion resulted in too many terms.
I found that to solve this problem must create a wordlist as follows
exec ctx_ddl.create_preference('MYWORLD_LIST','BASIC_WORDLIST');
exec ctx_ddl.set_attribute('MYWORLD_LIST', 'WILDCARD_MAXTERMS', 15000);
This because the default value of 'WILDCARD_MAXTERMS' is 5000.
and then alter the index as follows
ALTER INDEX my_index rebuild parameters('replace wordlist MYWORLD_LIST');
My question is If I do this thing which is the impact If there is, in
index maintenance,DML processing, disk resourses,index memory,and finally impact on rollback segment.

You will get a quicker, better, more expert answer if you post you questions on Oracle text in the Oracle text forum. Intermedia text is now known as Oracle Text.

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Impact when increase the wildcard_maxterms attribute value

In some queries the output was
ORA-29902: error in executing ODCIIndexStart() routine
ORA-20000: interMedia Text error:
DRG-51030: wildcard query expansion resulted in too many terms.
I found that to solve this problem must create a wordlist as follows
exec ctx_ddl.create_preference('MYWORLD_LIST','BASIC_WORDLIST');
exec ctx_ddl.set_attribute('MYWORLD_LIST', 'WILDCARD_MAXTERMS', 15000);
This because the default value of 'WILDCARD_MAXTERMS' is 5000.
and then alter the index as follows
ALTER INDEX my_index rebuild parameters('replace wordlist MYWORLD_LIST');
My question is If I do this thing which is the impact If there is, in
index maintenance,DML processing, disk resourses,index memory,and finally impact on rollback segment.

This number only effect the search criteria... a count.
I don't think that this will cause any performace issues with the ROLLBACK Segment.
This number only tell the database that now it can do a wilcard search upto 15000.
So if you query were resulting into more then 5000 this change will allow you to query upto 15000. However if your search still result more then 15000 it will error out.
Bottom line.. There is no performace hit on RBS& INDEX MANINTENACE..
However you search will get slower.
Shah Nawaz Thanks for the tip.

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I read that it's caused by the old drivers for the video card. I'm using GeForce 8800GT and I updated the driver with the latest version form the nVidia web site. The problem is still here!
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http://digital.ni.com/public.nsf/allkb/C204CAC86509342286256BBC00710918?OpenDocument
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Hi,
We are on BW3.5 version and we have a custom defined Info-object ZP_REPORT(say )whose length is 3 now as all the three digit series will be used up in near future we have a requirement to increase the length of the characteristic.
This Info-object is used Navigation attribute of 0Material. And also this info-object is used as Navigational characteristic in few Info-cubes.
Can any one please let me know what would be the impact of increasing the length?
1)Do I need to delete the master data from this ZP_REPORT?
2)DO I need to delete the master data from 0MATERIAL?
3)Will there be any impact on Info-Cubes?
Thanks in advance.
Regards
Ajay

Hi Ajay,
It is always big challenge to change the existing info object lengh or type or anything that have gone live already..........
But if we will be very careful at the time of changing length and transport, we can do it succefully......
Lets come to your scenario... In my understanding
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v) Finally if possible, create one backup cube and back master data and load data from your existing cube to that cube. If the data will be more that 2 GB it is not a simple task to take a backup..... This is only for safty purpose......
Please let me know your status...............
Best Regards,
Vivek

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On Fri, 15 Aug 2003 11:55:03 -0500 (CDT), HAL wrote:
>My performance is very slow when I run graphs. How do I increase the
>speed at which I can do other things while the data is being updated
>and displayed on the graphs?
>
>I am doing an an aquisition and displaying the data on graphs. When I
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>that into the number of samples to read at a time from the AI read.
>The problem is that it stalls until the data points are aquired and
>displayed so I cannot click or change values on the front panel until
>the updates occur on the graph. What can I do to be a
ble to help
>this?
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screen may not be refreshing very fast.
--Ray
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Re: Throughput drops dramatically when I increase the number of instances in a cluster

Thanks for the quick reply.
          Yes, we are running WLS with the performance pack.
          "Bernie Wong" <[email protected]> wrote in message
          news:[email protected]...
          > Fellow clusterers ....
          >
          > I have an EJB driver program that pumps work into a WLS cluster. For
          > scalability, I increase the number of drivers. The drivers have a big pool
          > of work to pump into the cluster.
          >
          > I noticed that with 6 (nothing special about that number) drivers, I can
          get
          > 500K worked items per hour in a single instance (clustered). That is, the
          > instance is cluster enabled and is watching for multicast, etc..
          >
          > When I add the second instance into the cluster, the cluster-wide
          throughput
          > with the six drivers drops to 370K items per hour. When I add the third
          > instance, the cluster-wide throughput drops further to 250K items per
          hour.
          > When I kill an instance, the throughput grows back to 370K items per hour.
          > When I kill another instance (to get back to one instance), the throughput
          > grows back to 500K/hr.
          >
          > Can somebody point out what we are doing wrong - do we need to tweek some
          > WLS parameters, do we have to avoid some features that limit cluster
          > scalability, etc..
          >
          > My WLS configuration is .....
          > - WLS 5.1, SP5
          > - JDK 1.2.1_04c with JIT, no Hotspot
          >
          > My hardware/software configuration consists of:
          > - an E4500 - 8 processor database server - this is only running at 15%
          > server busy
          > - three E4500 - all 8 processors/6GB RAM - application processors
          >
          > The cluster is implemented with one instance per application server.
          > Each application server is only 10-15% busy.
          >
          > My driver and application is ....
          > - stateless EJB driver and stateless EJB bean
          >
          > Your thoughts and comments would be greatly appreciated.
          >
          > Bernie
          >
          >


Thanks. It works. We screwed up the settings.
          "Bernie Wong" <[email protected]> wrote in message
          news:[email protected]...
          > Thanks for the reply.
          >
          > We ran the benchmark again and got the same scaling profile. This
          afternoon,
          > we are going to run a benchmark with a really simple driver + bean (a do
          > nothing bean) and see if we get the same scaling profile. From all the
          > responses, it would appear that WLS can scale therefore we want to isolate
          > the problem to either our code or our configuration (or both).
          >
          > I will let you know.
          >
          > Bernie
          >
          > "Rob Woollen" <[email protected]> wrote in message
          > news:[email protected]...
          > > Make sure that this was set on the client not the server.
          > >
          > > -- Rob
          > >
          > > Bernie Wong wrote:
          > > >
          > > > Jim,
          > > >
          > > > Thanks for the suggestions. One of my performance engineers ran
          several
          > > > experiments last week where he set the executeThreadCount to 6 and to
          10
          > > > along with a percentSocketReaders to 50. He saw no improvement. We
          will
          > > > rerun that experiment again since that seems to be the most common
          > > > recommendation.
          > > >
          > > > Bernie
          > > >
          > > > "Jim Zhou" <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > One possible reason is not enough socket reader execute threads, try
          > to do
          > > > > this:
          > > > > "-Dweblogic.system.executeThreadCount=10"
          > > > > "-Dweblogic.system.percentSocketReaders=50" on your client JVM
          startup
          > > > > command line.
          > > > >
          > > > > http://www.weblogic.com/docs51/admindocs/tuning.html#tuning clients
          > > > >
          > > > > WebLogic RMI
          > > > > If you are using WebLogic RMI clients and there are more than 2
          > Weblogic
          > > > > servers in a cluster, you may encounter a significant performance
          > > > > degradation (very long round trip times for stateless session beans,
          > for
          > > > > instance). The solution is to make some property changes on the
          client
          > > > side
          > > > > as explained below.
          > > > >
          > > > > The solution to this problem is to ensure that there are at least as
          > many
          > > > > socket reader threads as there are connections to the server and
          also
          > > > > allowing for some extra threads for processing other tasks. This is
          > > > > accomplished by starting the client with the command line argument
          > > > > "-Dweblogic.system.percentSocketReaders" set to a sufficiently high
          > > > > percentage (say 50) and by ensuring that there sufficient number of
          > > > execute
          > > > > threads for other processing on the client. A metric of twice the
          > number
          > > > of
          > > > > execute threads as there are servers in a cluster should work fine
          if
          > the
          > > > > above percentage is at 50. The command line argument affecting the
          > number
          > > > of
          > > > > execute threads is
          > > > >
          > > > > "-Dweblogic.system.executeThreadCount".
          > > > >
          > > > > For instance, we could use:
          > > > >
          > > > > "-Dweblogic.system.executeThreadCount=10"
          > > > >
          > > > > and
          > > > >
          > > > > "-Dweblogic.system.percentSocketReaders=50"
          > > > >
          > > > > when testing with 3 or 4 servers in a cluster.
          > > > >
          > > > >
          > > > > Bernie Wong <[email protected]> wrote in message
          > > > > news:[email protected]...
          > > > > > Thanks for the quick reply.
          > > > > >
          > > > > > Yes, we are running WLS with the performance pack.
          > > > > >
          > > > > >
          > > > > > "Bernie Wong" <[email protected]> wrote in message
          > > > > > news:[email protected]...
          > > > > > > Fellow clusterers ....
          > > > > > >
          > > > > > > I have an EJB driver program that pumps work into a WLS cluster.
          > For
          > > > > > > scalability, I increase the number of drivers. The drivers have
          a
          > big
          > > > > pool
          > > > > > > of work to pump into the cluster.
          > > > > > >
          > > > > > > I noticed that with 6 (nothing special about that number)
          drivers,
          > I
          > > > can
          > > > > > get
          > > > > > > 500K worked items per hour in a single instance (clustered).
          That
          > is,
          > > > > the
          > > > > > > instance is cluster enabled and is watching for multicast, etc..
          > > > > > >
          > > > > > > When I add the second instance into the cluster, the
          cluster-wide
          > > > > > throughput
          > > > > > > with the six drivers drops to 370K items per hour. When I add
          the
          > > > third
          > > > > > > instance, the cluster-wide throughput drops further to 250K
          items
          > per
          > > > > > hour.
          > > > > > > When I kill an instance, the throughput grows back to 370K items
          > per
          > > > > hour.
          > > > > > > When I kill another instance (to get back to one instance), the
          > > > > throughput
          > > > > > > grows back to 500K/hr.
          > > > > > >
          > > > > > > Can somebody point out what we are doing wrong - do we need to
          > tweek
          > > > > some
          > > > > > > WLS parameters, do we have to avoid some features that limit
          > cluster
          > > > > > > scalability, etc..
          > > > > > >
          > > > > > > My WLS configuration is .....
          > > > > > > - WLS 5.1, SP5
          > > > > > > - JDK 1.2.1_04c with JIT, no Hotspot
          > > > > > >
          > > > > > > My hardware/software configuration consists of:
          > > > > > > - an E4500 - 8 processor database server - this is only
          > running at
          > > > > 15%
          > > > > > > server busy
          > > > > > > - three E4500 - all 8 processors/6GB RAM - application
          > processors
          > > > > > >
          > > > > > > The cluster is implemented with one instance per application
          > > > server.
          > > > > > > Each application server is only 10-15% busy.
          > > > > > >
          > > > > > > My driver and application is ....
          > > > > > > - stateless EJB driver and stateless EJB bean
          > > > > > >
          > > > > > > Your thoughts and comments would be greatly appreciated.
          > > > > > >
          > > > > > > Bernie
          > > > > > >
          > > > > > >
          > > > > >
          > > > > >
          > > > >
          > > > >
          >
          >

Throughput drops dramatically when I increase the number of instances in a cluster

Fellow clusterers ....
I have an EJB driver program that pumps work into a WLS cluster. For
scalability, I increase the number of drivers. The drivers have a big pool
of work to pump into the cluster.
I noticed that with 6 (nothing special about that number) drivers, I can get
500K worked items per hour in a single instance (clustered). That is, the
instance is cluster enabled and is watching for multicast, etc..
When I add the second instance into the cluster, the cluster-wide throughput
with the six drivers drops to 370K items per hour. When I add the third
instance, the cluster-wide throughput drops further to 250K items per hour.
When I kill an instance, the throughput grows back to 370K items per hour.
When I kill another instance (to get back to one instance), the throughput
grows back to 500K/hr.
Can somebody point out what we are doing wrong - do we need to tweek some
WLS parameters, do we have to avoid some features that limit cluster
scalability, etc..
My WLS configuration is .....
- WLS 5.1, SP5
- JDK 1.2.1_04c with JIT, no Hotspot
- we enabled performance pack
My hardware/software configuration consists of:
- an E4500 - 8 processor database server - this is only running at 15%
server busy
- three E4500 - all 8 processors/6GB RAM - application processors
The cluster is implemented with one instance per application server.
Each application server is only 10-15% busy.
My driver and application is ....
- stateless EJB driver and stateless EJB bean
Your thoughts and comments would be greatly appreciated.
Bernie

The short answer is to set the following tuneables on the client side:
java -Dweblogic.system.executeThreadCount=10
-Dweblogic.system.percentSocketReaders=50 <your client program>
http://www.weblogic.com/docs51/admindocs/tuning.html#tuning clients
Srikant, [email protected], http://weblogic.bea.com/, etc.
Bernie Wong wrote:
Fellow clusterers ....
I have an EJB driver program that pumps work into a WLS cluster. For
scalability, I increase the number of drivers. The drivers have a big pool
of work to pump into the cluster.
I noticed that with 6 (nothing special about that number) drivers, I can get
500K worked items per hour in a single instance (clustered). That is, the
instance is cluster enabled and is watching for multicast, etc..
When I add the second instance into the cluster, the cluster-wide throughput
with the six drivers drops to 370K items per hour. When I add the third
instance, the cluster-wide throughput drops further to 250K items per hour.
When I kill an instance, the throughput grows back to 370K items per hour.
When I kill another instance (to get back to one instance), the throughput
grows back to 500K/hr.
Can somebody point out what we are doing wrong - do we need to tweek some
WLS parameters, do we have to avoid some features that limit cluster
scalability, etc..
My WLS configuration is .....
- WLS 5.1, SP5
- JDK 1.2.1_04c with JIT, no Hotspot
- we enabled performance pack
My hardware/software configuration consists of:
- an E4500 - 8 processor database server - this is only running at 15%
server busy
- three E4500 - all 8 processors/6GB RAM - application processors
The cluster is implemented with one instance per application server.
Each application server is only 10-15% busy.
My driver and application is ....
- stateless EJB driver and stateless EJB bean
Your thoughts and comments would be greatly appreciated.
Bernie

IMPACT WHEN INCREASE THE ATRIBUTTE WILDCARD_MAXTERMS

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