Clustering etc

Hi,
Sorry for long post and thanks for patience (read at leas first question (-:)
I would like to ask abt. session beans with Local interface in cluster enviroment and a WEB want to access such bean. I can guess that with stateless beans the situation is easy: the bean will be created locally and used, but what with stateful beans if the previous request was realized on other machine? will it replicate? on what basis?
My question is part of a bigger one: what are the cases where I need to use remote interface: I know "the sparate JVM or EAR" but I mean in practice:
-I have separate EARs if I have two applications - that is clear.
- But when I have separete JVM?:
a) In cluster enviroment: but Local interface can be used
b) when WEB and EJB container are separated: in what situation it is desired
c) other?
Thnks for answers in advance.
BTW: I looked in google first - didnt find all the answers

but what with stateful beans if the previous request was realized on other
machine? will it replicate? on what basis?Generally, Stateful Session beans's state si replicated/saved at the end of a method request OR at the end of the transaction in which it participated comiits/rollsback. This way if there is a failure, the SFSB can be resurrected properly.
My question is part of a bigger one: what are the cases where I need to use >remote interface: I know "the sparate JVM or EAR" but I mean in practice:
I have separate EARs if I have two applications - that is clear.
But when I have separete JVM?:
a) In cluster enviroment: but Local interface can be used
b) when WEB and EJB container are separated: in what situation it is >desired
c) other?If your client and EJBs are always going to be colocated (Like a Session bean calling a EntityBean), then can use LocalInterface otherwise you can use Remote interface.
What dow you mean by: If the Web and EJB Containers are separated
In Glassfish, a cluster of instances essentially contain a group of homogenous instances (meaning each instance in the cluster has the exact set of bits and hence has exact set of applications deployed). Hence each instance has both WEB and EJB Containers.
If you are talking about a setup where the WebContainer (like Tomcat) talking to another JavaEE Server (like GlassFish), the obviously you have to deploy you .war files into Tomcat (WebContainer) and then the .jar to the JavaEE Server. The replication will be handled by the respective containers.

Similar Messages

Clusters

          Hi
          I am working on weblogic for some time but never used clusters etc. I am basically
          a developer so can anyone tell me
          that does it require any special attention or modifications from developer point
          of view when developing an application which would be clustered.
          And also if you can tell me how to do clustering particularly servlets etc
          in brief it would be helpful
          thanks
          bobby


Bobby,
          Try get started with:
          http://www.weblogic.com/docs51/cluster/index.html
          kumar.
          Bobby wrote:
          > Hi
          >
          > I am working on weblogic for some time but never used clusters etc. I am basically
          > a developer so can anyone tell me
          > that does it require any special attention or modifications from developer point
          > of view when developing an application which would be clustered.
          >
          > And also if you can tell me how to do clustering particularly servlets etc
          > in brief it would be helpful
          > thanks
          > bobby

Architecture types to achieve application isolation,scalability,HA, etc

Hello,
Can someone please point me to a document/material for different architecture types and best practices for weblogic architectures? Like different architecture types to achieve application isolation,scalability,HA, Clustering, etc
Edited by: user9021545 on Mar 18, 2011 10:51 AM

We have several pieces of documentation that cover this type of thing.
Here's the Fusion Middleware High Availability Guide:
http://download.oracle.com/docs/cd/E14571_01/core.1111/e10106/toc.htm
and some high level topologies:
http://download.oracle.com/docs/cd/E14571_01/core.1111/e10106/busreq.htm#CHDEECIG
And WebLogic Server specific HA information:
http://download.oracle.com/docs/cd/E14571_01/core.1111/e10106/aa.htm#CFADJHAC
That's probably as good as place as any to start with and hopefully gives you something to work with.
-steve-

EJB descriptors for clustering!

Hi,
          Are ALL EJB's compiled for clustering by default (without specifying the
          value for <home-is-clusterable>, etc in the weblogic-ejb-jar) ?
          If yes, is there any recommendation from BEA to specify this voluntarily for
          every EJB ?
          Bye,
          Sriram.C.S


[att1.html]

One user for multiple tablespaces

Hello.
Oracle 11g enterprise.
Whenever I setup a new tablespace on my server, I create a user for each tablespace on the server.
Is is possible to create only one user for all tablespaces on a server?
What is the easiest way to create this one user to have all roles and privileges across all tablespaces?
Any suggestions are greatly appreciated.

I would seriously question a design with 'N' databases (whether they are on 1 or more or 'N' servers is not the issue) and DBLink from each of the databases to every other database.
Not only is it going to be hell to manage (how and when can you decide to shutdown a database for maintenance / patching / server/hardware maintenance when you have N-1 others connecting to it online), but it indicates a possibly high level of data duplication.
So we still revert to why you think you need that many databases and that many users and that many database links.
As has been pointed out, there is no relation between tablespaces and DBLinks. NONE whatsoever.
As for tablespaces and users, I can have
a. One Tablespace and 10 database accounts with any 1 to 10 of the accounts storing data objects in the tablespace
b. Ten Tablespaces and 1 database account storing data objects across all 10 tablespaces
c. 100 database accounts but only 1 to N of them having any data objects, the others only doing SELECT/INSERT/UPDATE/DELETE on objects owned by 1 to N schemas. (This one schemas all being in 1 tablespace or M tablespaces).
There is no one-to-one correspondence between users and tablespaces necessary. Tablespaces are for logical grouping of data objects.
I keep referring to data objects as these (Tables, Indexes, LOBs, IOTs, Clusters etc) require storage. Objects like Sequences do not require separate tablepaces although they have persistent values. Objects like DBLinks and Views are only definitions and require no storage (other than in the data dictionary !). Objects like Procedures and Packages and Triggers are code objects and require no storage (other than in the data dictionary).
So :
1. Such a design needs to be questioned.
2. Even if you need such a design, do not tie DBLinks to Tablespaces.
3. Even if you need DBLinks, do not tie Users to Tablespaces.

Exchange 2013 SP1 | Another HTTP 500.0.0 Error

Help!
We are in the middle of migrating from Exchange 2010 SP3 to Exchange 2013 SP1 and we are being plagued with HTTP 500 errors on every Exchange 2013 server now.
I have two Client Access servers installed (EXCHFE01 & EXCHFE02) and one backend mailbox server (EXCHMB03) with the Client Access role also installed (for troubleshooting purposes). Once I get everything working I'll install two backend 2013 servers
with the mailbox role only for production (load-balanced, clustered, etc). I still have two Exchange 2010 mailbox servers left since one has a single large mailbox left on it and the other hosts public folders. I'll get to migrating those later. All Exchange
2013 servers are running Windows Server 2012. All are on the same LAN and no firewalls are between them.
On all three 2013 servers (EXCHFE01, EXCHFE02, EXCHMB03) I'm getting the dreaded HTTP 500 error whether I try to get to OWA or ECP. This did work at one point where I could at least login to the mailbox server (EXCHMB03) and migrate all my mailboxes over
to it. Sometime this morning after the two Client Access servers were installed the mailbox server stopped working (HTTP 500 errors). This is very frustrating because I can't even login to a console to manage Exchange from any server at this point.
Both Client Access servers aren't really showing anything of value in the event logs or the IIS logs. The mailbox server (EXCHMB03) does show the following event 3002:
Protocol /Microsoft-Server-ActiveSync failed to process request from identity NT AUTHORITY\SYSTEM. Exception: Microsoft.Exchange.Security.Authentication.BackendRehydrationException: Rehydration failed. Reason: Source server 'NT AUTHORITY\SYSTEM' does not have token serialization permission.
at Microsoft.Exchange.Security.Authentication.BackendRehydrationModule.ProcessRequest(HttpContext httpContext)
at Microsoft.Exchange.Security.Authentication.BackendRehydrationModule.OnAuthenticateRequest(Object source, EventArgs args).
...and I get the following when I run the Exchange Management Shell tool on the same mailbox server (along with lots of other red HTML text):
More Information:
This error means that there was a problem while processing the request. The request was received by the Web server, but during processing a fatal error occurred, causing the 500 error.
The Client Access servers show the following errors:
Performance counter updating error. Counter name is Location cache update time, category name is MSExchange Active Manager Client. Optional code: 3. Exception: The exception thrown is : System.InvalidOperationException: The requested Performance Counter is not a custom counter, it has to be initialized as ReadOnly.
at System.Diagnostics.PerformanceCounter.InitializeImpl()
at System.Diagnostics.PerformanceCounter.set_RawValue(Int64 value)
at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.set_RawValue(Int64 value)
Last worker process info : System.ArgumentException: Process with an Id of 4040 is not running.
at System.Diagnostics.Process.GetProcessById(Int32 processId)
at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetLastWorkerProcessInfo()
Processes running while Performance counter failed to update:
888 svchost
264 smss
532 conhost
2576 Microsoft.Exchange.UM.CallRouter
1596 WMSvc
3932 dllhost
4020 svchost
2308 dwm
5060 taskhostex
844 svchost
1972 Microsoft.Exchange.Directory.TopologyService
1228 inetinfo
1316 vmtoolsd
3896 svchost
780 svchost
1580 rundll32
1668 mqsvc
816 dwm
3840 slui
3532 rdpclip
3980 WmiPrvSE
4200 SppExtComObj
4288 winlogon
2140 SMSvcHost
676 svchost
1564 svchost
1296 Microsoft.Exchange.Diagnostics.Service
1472 Microsoft.Exchange.ServiceHost
1204 svchost
1292 ServerManagerLauncher
488 winlogon
664 svchost
572 lsass
3236 dllhost
2972 WmiPrvSE
4484 w3wp
388 csrss
1600 rundll32
564 services
1260 msdtc
5032 sppsvc
1448 MSExchangeHMHost
824 LogonUI
4204 VSSVC
2524 userinit
2700 MSExchangeFrontendTransport
1708 SMSvcHost
728 svchost
460 wininit
904 svchost
992 svchost
4996 TSTheme
4240 slui
4904 taskhost
452 csrss
4340 csrss
4 System
1164 spoolsv
1988 slClient
2760 MSExchangeHMWorker
0 Idle
Performance Counters Layout information: FileMappingNotFoundException for category MSExchange Active Manager Client : Microsoft.Exchange.Diagnostics.FileMappingNotFoundException: Cound not open File mapping for name Global\netfxcustomperfcounters.1.0msexchange active manager client. Error Details: 2
at Microsoft.Exchange.Diagnostics.FileMapping.OpenFileMapping(String name, Boolean writable)
at Microsoft.Exchange.Diagnostics.PerformanceCounterMemoryMappedFile.Initialize(String fileMappingName, Boolean writable)
at Microsoft.Exchange.Diagnostics.ExPerformanceCounter.GetAllInstancesLayout(String categoryName)
... and...
A transient failure has occurred. The problem may resolve itself. Diagnostic information:
Microsoft.Exchange.Data.DataSourceOperationException: The request failed. The remote server returned an error: (503) Server Unavailable. ---> Microsoft.Exchange.WebServices.Data.ServiceRequestException: The request failed. The remote server returned an error: (503) Server Unavailable. ---> System.Net.WebException: The remote server returned an error: (503) Server Unavailable.
at System.Net.HttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.EwsHttpWebRequest.Microsoft.Exchange.WebServices.Data.IEwsHttpWebRequest.GetResponse()
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
--- End of inner exception stack trace ---
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.GetEwsHttpWebResponse(IEwsHttpWebRequest request)
at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request)
at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalFindFolders(IEnumerable`1 parentFolderIds, SearchFilter searchFilter, FolderView view, ServiceErrorHandling errorHandlingMode)
at Microsoft.Exchange.WebServices.Data.ExchangeService.FindFolders(FolderId parentFolderId, SearchFilter searchFilter, FolderView view)
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.InvokeServiceCall[T](Func`1 callback)
--- End of inner exception stack trace ---
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.InvokeServiceCall[T](Func`1 callback)
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.GetOrCreateFolderCore(String folderName, FolderId parentFolder, Func`1 creator)
at Microsoft.Exchange.Data.Storage.Management.AsyncOperationNotificationDataProvider.GetDefaultFolder()
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.<>c__DisplayClass1b`1.<InternalFindPaged>b__13()
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.InvokeServiceCall[T](Func`1 callback)
at Microsoft.Exchange.Data.Storage.Management.EwsStoreDataProvider.<InternalFindPaged>d__21`1.MoveNext()
at Microsoft.Exchange.Data.Storage.Management.AsyncOperationNotificationDataProvider.<GetNotificationDetails>d__4.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
at Microsoft.Exchange.Servicelets.CertificateNotificationServicelet.RemoveAllNotification()
at Microsoft.Exchange.Servicelets.CertificateNotificationServicelet.UpdateDataInMbx(List`1 certificates)
at Microsoft.Exchange.Servicelets.CertificateNotificationServicelet.Work()
I've tried all sorts of recommended fixes but none have worked so far:
ADSIEdit and remove msExchCanaryData0 data
Reinstall Exchange multiple times
Rebooted multiple times
This article: http://social.technet.microsoft.com/Forums/exchange/en-US/08d3777c-dc03-4411-8c87-7db37d2f406a/exchange-2013-owa-login-error-http-500?forum=exchangesvrclients
Rebooted DCs multiple times (no exchange servers are DCs)
I'm sure I've left out a few troubleshooting steps since I've been working at this for two days. Can anybody offer any advice? I'm at my wits end here...

Hi,
Please check whether the mail.mydomain.com is pointed to your Exchange 2010 or Exchange 2013. Please run the following command to check your OWA virtual directores and ECP virtual directories:
Get-OwaVirtualDirectory -ShowMailboxVirtualDirectories | Select Identity,name,Internalurl,ExternalUrl,*auth*
Get-EcpVirtualDirectory -ShowMailboxVirtualDirectories | Select Identity,name,Internalurl,ExternalUrl,*auth*
In IIS manager > Default Web Site, please make sure Anonymous Authentication is Enabled in Authentication. Confirm that "Require SSL" is checked on the SSL Settings of the default web site.
Regards,
Winnie Liang
TechNet Community Support

What are the limitations of using RMI over http with EJB?

We have a requirement for an intranet application where the majority of the clients
(Swing clients) will be able to connect directly using either T3 or IIOP. However,
there are a number of clients that will need to traverse a firewall.
We could use SOAP, but I dont want to lose the value that RMI gives us (clustering,
security, statefullness support etc). I am thinking of using RMI over http - which
Weblogic supports.
I have been trying to find some documentation on the topic - but havent succeded
so far. What I would like to understand is: What limitations I would have using
RMI over http. Do I lose anything (apart from performance) using http?
Regards,
Nick

You will have to enable tunneling on the server side and I have not heard of any
complaints of using it.
Shiva.
Nick Minutello wrote:
In fact, we are not using applets - and its not an internet application. We are
using Java Webstart and Swing on our intranet (the problem of the size of the
weblogic.jar is a pain - but well known)
The question for me is; Apart from performance, are there any limitations to using
RMI over http?
Can we also use JMS over http?
-Nick
Shiva Paranandi <[email protected]> wrote:
"Old wine new bottle".
The biggest problem with the approach of Applets like
stuff connecting to weblogic is the size of the classes that need to
be supplied to the
users. The applets/swing would need a lot of weblogic classes which you
need to
supply as jar file. This file can be in the order of MBs depending on
the
weblogic version. we had a similar kind of problem and migrated the applets
to use
servlets instead of directly invoking ejbs or jms topics etc. Having
the applets
connect
to servlets you would still benefit from the features of clustering etc.
and added to
that
you would reduce the number of remote calls.
Shiva.
Nick Minutello wrote:
We have a requirement for an intranet application where the majorityof the clients
(Swing clients) will be able to connect directly using either T3 orIIOP. However,
there are a number of clients that will need to traverse a firewall.
We could use SOAP, but I dont want to lose the value that RMI givesus (clustering,
security, statefullness support etc). I am thinking of using RMI overhttp - which
Weblogic supports.
I have been trying to find some documentation on the topic - but haventsucceded
so far. What I would like to understand is: What limitations I wouldhave using
RMI over http. Do I lose anything (apart from performance) using http?
Regards,
Nick

Not able to access the Database & Clusterware from OEM Console.

hi,
I had installed Oracle RAC 11g R2 in RHEL 5.3 Operating environment. I had installed my Oracle RAC with Enterprise Manager Console.
Its with the defailt port 1158. After the installation when i try to access my EM Console, i was not able to access the Database and Clusterware from EM Console.
When i access the EM console with url, I found with Startup and Perform Recovery option. But whereas my database is already startup and running.
So when i click startup its saying database is already started. Since it is a prodution environment i dont want to go with Perform recovery option.
Please tell me hw to attach files in this thread so that i can send the snap shot of the console for your reference.
with regards
A.Aravind
Edited by: 795847 on Sep 21, 2010 10:40 PM

hi,
As mentioned due to not having the default listener port 1521, we are facing this problem.
As meniotned i had changed the emoms.properties file and changed the port and my emctl page is opening.
But am not able to access the other parameters like ASM, Servers, Clusters etc bcoz since in some file it is looking for 1521 default port.
So is it better to go for emctl deconfig and config again or to change the port the files which required.
If i do in what are the file the default port will be located related to emctl.
with regards
A.Aravind

Logical Database design and physical database implementation

Hi
I am an ORACLE DBA basically and we started a proactive server dashboard portal ,which basically reports all aspects of our infrastructure (Dev,QA and Prod,performance,capacity,number of servers,No of CPU,decomissioned date,OS level,Database patch level) etc..
This has to be done entirely by our DBA team as this is not externally funded project.Now i was asked to do " Logical Database design and physical Database
implementation"
Even though i know roughly what's that mean(like designing whole set of tables in star schema format) ,i have never done this before.
In my mind i have a rough set of tables that can be used but again i think there is lot of engineering involved in this area to make sure that we do it properly.
I am wondering you guys might be having some recommendations for me in the sense where to start?are there any documents online , are there any book on this topic?Are there any documents which explain this phenomena with examples ?
Also exactly what is the difference between logical database design vs physical database implementation
Thanks and Regards

Logical database design is the process of taking a business or conceptual data model (often described in the form of an Entity-Relationship Diagram) and transforming that into a logical representation of that model using the specific semantics of the database management system. In the case of an RDBMS such as Oracle, this representation would be in the form of definitions of relational tables, primary, unique and foreign key constraints and the appropriate column data types supported by the RDBMS.
Physical database implementation is the process of taking the logical database design and translating that into the actual DDL statements supported by the target RDBMS that will create the database objects in a target RDBMS database. This will generally include specific physical implementation details such as the specification of tablespaces, use of specialised indexing (bitmap, clustered etc), partitioning, compression and anything else that relates to how data will actually be physically stored inside the database.
It sounds like you already have a physical implementation? If so, you can reverse engineer this implementation into a design tool such as SQL Developer Data Modeller. This will create a logical design by examining the contents of the Oracle data dictionary. Even if you don't have an existing database, Data Modeller is a good tool to use as a starting point for logical and even conceptual/business models.
If you want to read anything about logical design, "An Introduction to Database Systems" by Date is always a good starting point. "Database Systems - A Practical Approach to Design, Implementation and Management" by Connolly & Begg is also an excellent reference.

Business logic in a Java Class

Hi,
In case of RPC web services why it is necessary to have a stateless
session bean ? can i have a simple java class instead ?
thanks and regards
Vedant

Hi Vedant,
WLS 6.1 does not currently support using POJOs (Plain Old Java Objects) as a service
implementation. I think the reasoning behind this was that WebLogic Web Services
where designed to "complement" Web Services technology, using "stateless" J2EE
components and J2EE packaging (i.e. war file, ear file). Seeing as the principle
network protocol for them (the web services' technologies) is HTTP, which is inturn
stateless ;-) There's also the factor that J2EE provides enterprise-level capabilities
(i.e. scalability, transactions, failover, clustering, etc.), that just aren't
there with a POJO. To me, this is a bit different than the approach being taken
with Java-based SOAP implementations, like Apache SOAP, that support using POJOs,
but don't take into consideration the "enterprise-level" aspects (or architectual
needs/best practices) for Web Services. If you think about the following requirements
for a given SOAP service, you'll see how using "lightweight" J2EE components has
merit 1) will be called thousands of times per second, and 2) must have <3 sec
avg response time, and 3) must have 99.9% uptime/availablity, and 3) must transparently
failover to another instance of the SOAP service on failure.
Regards,
Mike Wooten
"Vedant" <[email protected]> wrote:
Hi,
In case of RPC web services why it is necessary to have a stateless
session bean ? can i have a simple java class instead ?
thanks and regards
Vedant

Acrobat X selection tool fails to detect paragraphs of text...

Acrobat X selection tool fails to detect paragraphs of text. Manually selected paragraphs have broken sentences with line breaks. This problem is also noticed when you attempt to triple click a paragraph and only one line of text is selected instead of a paragraph. Can this be fixed?

can't it tell by the visual formatting of indents, text proximity/clusters, etc? if humans can tell, why can't acrobat be trained to tell?

Make Acrobat X selection tool detect paragraphs of text...

Acrobat X selection tool fails to detect paragraphs of text. Manually selected paragraphs have broken sentences with line breaks. This problem is also noticed when you attempt to triple click a paragraph and only one line of text is selected instead of a paragraph. Can this be fixed?

can't it tell by the visual formatting of indents, text proximity/clusters, etc? if humans can tell, why can't acrobat be trained to tell?

Question about HTTP Server and 9iAS

I am kind of new to Oracles 9is products. I installed Oracle 9i Rel. 2 recently and it installed HTTP Server and other stuff as part of that install. I am trying to write a small web application. Is this install good enough to do basic servlet's, jsp's and may be EJB's etc ... or do I need to install 9iAS. I am confused on the fact that I know 9iAS will give me j2ee container, web container, clustering, etc ..., what functionality is included in the 9i databases web server piece.
Also, can anyone point me to a good documentation that explains directory structure of 9i Rel. 2. I am familiar with the database part fairly well(oracle 7 release). However, I am confused as to new web related stuff (Apache, bc4j, etc..) in 9i Rel. 2.
Thanks.

Hi,
No, you cannot run EJB's in the Apache installation. For that you might want to download OC4J.
Basic Http pages and Servlets can run but I dont think it is advisable to use it for that. For any kind of development, I would suggest you to use OC4J.
Oracle9i Database is web enabled and you can access the table, etc.. from a browser too. This is the reason Apache is provided with the basic installation. Oracle9i Rel 2 has XML DB in it which again can be accessed from the Web.
For more help on any of these check http://otn.oracle.com/documentation/oracle9i.html
You will be able to get all the related Developer's Guide here.
Hope this helps,
Rajat

An AP500 with internal antennas?

Is there any chance that an AP500 might be developed with internal antennas?
I have at least one deployment where the AP541N might have been seriously considered, except for its external antennas, which for that site are too vulnerable... of being moved, tampered, etc.
So in that case the AP1142 with its internal antennas and smaller footprint, is a better fit. But the 1142 is a lot more expensive, doesn't do clustering, etc.
If a new model of AP500 were developed to fit into the casing of an AP1140 that would be, for some customers, quite an enticing product!
But I'm not holding my breath... it seems Cisco made a decision to use only external antennas with these.
-Rich

Rich,
Thank you for your feedback, its great to hear from end-users about how we can make our product lines fit your needs better. These boards are HIGHLY visible to Cisco. Therefore, I'm sure your concerns will be heard and addressed accordingly.
Bill

Explain plan going in Billions

Dear All,
We are having a huge table of data and when I am running explain plan for the table I am getting the below plan from ORACLE.
| Id | Operation | Name | Rows | Bytes | Cost | Pstart| Pstop |
| 0 | SELECT STATEMENT | | 4149 | 129K| 1692 | | |
| 1 | SORT GROUP BY NOSORT | | 4149 | 129K| 1692 | | |
| 2 | VIEW | | 4149 | 129K| 1692 | | |
| 3 | SORT GROUP BY | | 4149 | 717K| 1692 | | |
| 4 | FILTER | | | | | | |
| 5 | HASH JOIN | | 4149 | 717K| 1691 | | |
| 6 | TABLE ACCESS FULL | R_CFG_CATEGORY_MAS | 103 | 4429 | 3 | | |
| 7 | HASH JOIN | | 4149 | 542K| 1687 | | |
| 8 | PARTITION RANGE ITERATOR | | 4149 | 287K| 21687 | KEY | KEY |
| 9 | PARTITION HASH SINGLE | | 4149 | 287K| 21687 | KEY | KEY |
| 10 | TABLE ACCESS FULL | R_CFG_WH_EXCEP | 4149 | 287K| 21687 | | |
| 11 | MERGE JOIN CARTESIAN | | 2105K| 126M| *18E*| | |
| 12 | VIEW | | 475 | 10925 | 3 | | |
| 13 | CONNECT BY WITH FILTERING | | | | | | |
| 14 | TABLE ACCESS BY INDEX ROWID| R_CFG_CAT_HIERARCHY_MAS | | | | | |
| 15 | NESTED LOOPS | | 19 | 247 | 3 | | |
| 16 | TABLE ACCESS FULL | R_CFG_CAT_HIERARCHY_MAS | 19 | 171 | 3 | | |
| 17 | INDEX UNIQUE SCAN | PK_RCCHM_CAT_REGID_PK | 1 | 4 | 0 | | |
| 18 | HASH JOIN | | | | | | |
| 19 | CONNECT BY PUMP | | | | | | |
| 20 | TABLE ACCESS FULL | R_CFG_CAT_HIERARCHY_MAS | 475 | 5225 | 3 | | |
| 21 | TABLE ACCESS FULL | R_CFG_CAT_HIERARCHY_MAS | 475 | 5225 | 3 | | |
| 22 | BUFFER SORT | | 4432 | 173K| *18E*| | |
| 23 | TABLE ACCESS BY INDEX ROWID | R_DEVICE_INFO | 4432 | 173K| *18E*| | |
| 24 | BITMAP CONVERSION TO ROWIDS| | | | | | |
| 25 | BITMAP INDEX SINGLE VALUE | R_DEVICE_INFO_CPYKEY | | | | | |
Note
- 'PLAN_TABLE' is old version
I can see cost in 18E which is huge and ridiculous.
I can explain points that I noted on this table.
This table is having more than 1 BILLIION RECORDS AND I am querying for a user which has got 5 MILLION RECORDS.
This table is properly partitioned and is having proper indexes.
We got some BITMAP indexes on this table also.
This table has got proper partitioned indexes also. (But the indexes and the table are in the same tablespace).
Can Anyone give me some sugessitions on how to reduce the overall cost.
Appreciate your response on this one.
Thanks,
Madhu K.

569725 wrote:
I can see cost in 18E which is huge and ridiculous.For a cartesian merge join... Cartesian joins are notoriously expensive.
This table is having more than 1 BILLIION RECORDS AND I am querying for a user which has got 5 MILLION RECORDS.Does not matter. The number of rows (note we store rows in tables, not records) does not matter. It is about how much I/O is needed to process that amount of data.
And this is what invariably we design for.. using relational design, using indexes, using partitioning, using clustering, etc. All these are techniques to reduce I/O. From eliminating duplication of data to providing optimal I/O paths to the data.
A real world example:
SQL> set timing on
SQL> select count(*) from daily_xxxxx;
COUNT(*)
2160339906
Elapsed: 00:00:10.09
SQL>
SQL> select count(*) from all_objects;
COUNT(*)
51255
Elapsed: 00:01:43.60So despite "+processing+" over 2 billion rows, the count is significantly faster than the count of the very much smaller ALL_OBJECTS view.
Why? Because it took less I/O to count those 2 billion rows (using a single index) than the nearly 52 thousand objects in the data dictionary (using several indexes and tables).
The rules that governs performance do not change with the number of rows in a table. The same rules and principles apply. What does change is the "+error margin+" - you are going to see a performance problem quite a lot sooner on a large table than a very small table. You may not notice that a 1ms overhead per row is a performance problem on a 100 row table. You will definitely notice it on a million row table.
So forget about the number of rows in these tables. Make sure that the SQL is designed logically correctly. Make sure that the table/db design provides optimal I/O paths for that SQL.
And catersian merge joins, nested loops with full table scans and so on.. that points to both these as being potential problems. SQL designed incorrectly (like forgetting join criteria). Table design lacking (requiring nested loop full table scans as oppose to index range scans or hash joins).
Oh yeah - and as already mentioned, forget the cost that the execution plan shows. Unless you know what unit that cost is expressed in and how to interpret it?

Clustering etc

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