Too many collections?

Hello everyone! I would like to ask a question that is maybe related to architecture.
I am making a soccer db, which holds some information.
A part of the model is as follows (expressed in UML):
1 1..* 1 1..*
League ------------- Team ------------------ PlayerI suppose this model is correct. However I need a user interface where users will be able to see a list of the leagues the teams and the players. They will also be able to change the information.
This means that I have to have collection classes for each class in the system?
For instance for the league class, I need a Collection of Leagues that will hold/populate from the db the information of each separate league. I will also need a collection of teams in order to show the information on screen. This would make the model like this:
1 1..* 1 1 1 1..* 1 1 1 1..*
Leagues ------------League---------Teams--------Team ----Players------PlayerAre there any alternatives to this approach, or do I have to have collections of every class?
Thanks in advance for your answers!

Thank you very much for your answer jverd.
I also want to keep the model simple. I was going to implement 1-many relations with java collections (LinkedHashSet), since the classes are already created as you described by a CASE tool that I am using.
But it seems like it will need a lot of processing. For example in the first model if I want to display a list of all the players irrespective of the Team (all the players that exist in the system), I have to have a populateRelatedTeams function for each League (that will fetch the teams of the specific League) and if I call it for every League it will eventually fetch all of the teams in all of the Leagues. Then for every team I should have a populateRelatedPlayers that will fetch the players of the specific Team.
But this means a lot of select queries in the database.
The second option I think I have (if I do not use specific collections) is to create a method in the Team object which will get all the players, irrespective of the Team. Then all I have to do in my code is create a "dummy" Team object and call that method. This will only need a select statement from the db and I won't have to populate the whole class tree. But I have a feeling that I am mixing things if I do it this way. Or maybe not?

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Disk Controller,"Standard Dual Channel PCI IDE Controller (ATA) [VEN: 8086, DEV: 3B20]"
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Hard Disk Heads,16
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Minimum PIO Transfer Time With IORDY,120 ns
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Read Ahead Buffer,"Supported, Enabled"
DMA,Supported
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S.M.A.R.T.,Supported
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Hi! Sense no one is replying. If your getting bad sectors; it's time to save your data and replace your HD. It's only a matter of time before your HD fails.
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I Love my Satellite L775D-S7222 Laptop. Some days you're the windshield, Some days you're the bug. The Computer world is crazy. If you have answers to computer problems, pass them forward.

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*Cause:
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Hi Odie,
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This Example works fine:
DECLARE
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blocking_sessions session_type;
BEGIN
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DECLARE
TYPE session_type IS TABLE OF v$session%ROWTYPE ;
blocking_sessions session_type;
BEGIN
select distinct blocking_session bulk collect into blocking_sessions from v$session where blocking_session is not null;
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...User task 281 blocked in stae 'Prep-End(230)' since 902s, DB procedure : APS_ACT_SCHEDULE, pid 3168
before we had the warining: UTK5 is running 1804s, CPU 50% and CPU 100% (LC)
we have checked knldiag/knldiagerr files and we are unable to find what is the root cause of the problem?
How could we analyse this issue and find the treatment which triggers this issue?
(trace: (SAPAPO/OM01)
Thanks and Best regards,
any help would be rewarded.
Best regards,
John
Edited by: DCWE COREADMIN on Feb 11, 2011 6:54 PM

Hello John,
We need additional information about the liveCache version, OS of the liveCache server; more details about situation when the issue occurred. Run "x_cons <SID> sh all 10 10 > task_info.txt" when the issue occurred to collect more information.
Check if the savepoint task is active - "x_cons <SID> show active".
Is the issue occurred during high loading to te liveCache?
Please review the SAP note 1391322 where the SPORADIC standstill in high load situation is also described, this issue is already fixed in the new liveCache releases.
This situation occured sporadically. It will be helpful to login to your system for further analysis of the reported issue to get clear if your system run into this known problem because the savepoint was hanging, because of that you had big amount of the user tasks which were hours in the state 'Prep-End' until the liveCache restart.
< It could be the reason for "livecache issue LC10 BY0 > Too many users (task limit)", you reached the MAXUSERTASKS limit,
the increasing of the liveCache parameter will not help you to solve the issue. >
You checked/saw the Database Analyzer log :
"User task 281 blocked in stae 'Prep-End(230)' since 902s, DB procedure : SAPAPO_CLEANUP application pid
User task 281 blocked in stae 'Prep-End(230)' since 902s, DB procedure : SIM_SIMSESSION_CONTROL, pid 31685
...User task 281 blocked in stae 'Prep-End(230)' since 902s, DB procedure : APS_ACT_SCHEDULE, pid 3168
You are SAP customer. As already recommended by Ivan, create the SAP message to the component "BC-DB-LVC" and get SAP support.
Thank you and best regards, Natalia Khlopina

ORA-31186: Document contains too many nodes

Hi all,
DB version:
BANNER
Oracle Database 10g Enterprise Edition Release 10.1.0.5.0 - 64bi
PL/SQL Release 10.1.0.5.0 - Production
CORE     10.1.0.5.0     Production
TNS for HPUX: Version 10.1.0.5.0 - Production
NLSRTL Version 10.1.0.5.0 - Production i am getting the "ORA-31186: Document contains too many nodes" error when listitem nodes come more then 70,000.
my code like below.
l_xmldoc := '<listitems>
<listitem><homePhone>6666446666</homePhone><mobile>9988776655</mobile><emailaddr><![CDATA[[email protected]]]></emailaddr><deviceid>1</deviceid></listitem>
<listitem><homePhone>6666446666</homePhone><mobile>9988776656</mobile><emailaddr><![CDATA[[email protected]]]></emailaddr><deviceid>1</deviceid></listitem>
<listitem><homePhone>6666446666</homePhone><mobile>9988776657</mobile><emailaddr><![CDATA[[email protected]]]></emailaddr><deviceid>1</deviceid></listitem>
</listitems>';
SELECT EXTRACT(l_xmldoc,'/listitems/listitem')   into l_xmldoc FROM DUAL;--error raising here
SELECT EXTRACTVALUE( VALUE(t),'/listitem/emailaddr')
             ,EXTRACTVALUE( VALUE(t),'/listitem/mobile')
             ,EXTRACTVALUE( VALUE(t),'/listitem/homephone')
             ,EXTRACTVALUE( VALUE(t),'/listitem/deviceid')
BULK COLLECTION INTO t_table
FROM TABLE(XMLSEQUENCE(l_xmldoc)) t;Please help me to understand why this error occurs and how to resolve.
Thanks,
Ram

>
You can find a little bit extra info in the search errors section on OTN regarding doc's 10gR2:
* ORA-31186: Document contains too many nodes
Cause: Unable to load the document because it has exceeded the maximum allocated number of DOM nodes.
Action: Reduces the size of the document.
>
Check this discussion -- ORA-24817 and ORA-31186 (undocumented errors)
Somebody suggested - Increasing the shared_pool_size and the java_pool_size will fix this.
Please check,
Edited by: ranit B on Nov 27, 2012 4:37 PM

Too many collections?

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