Best practice for database calls from Java components?

I have a java component that encapsulates some complex database logic. In unit tests, I pass in a jdbc connection.
Is there a way to pass in a database connection from PBL for a database defined as an External Resource in an ALBPM project? That way, I can test it using the "abstract" definition in the project and know that when it is deployed to production it will use the concrete definition. And, I won't have to maintain a separate configuration of the JDBC url.
Is there a better way to do this? Or is it possible?
Thanks,
Todd

Hi Bruno,
The main issue with the combination of stateful session beans and servlets is the servlet threading model.
It is dangerous to store a stateful session bean reference in servlet instance state, since the servlet instance
can be accessed concurrently, yet a stateful session bean reference is intended to be used by only one
client.
As you point out, one alternative is to store the reference in the HttpSession. That associates the reference
with a particular client, which matches the stateful session bean programming model.

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Best Practice for EJB calls from servlet?

Hi folks
I could not find general rules for making calls to an stateful EJB from the web container (e.g. from a backingBean). In some books they say it is a bad programming style calling them directly from a common servlet. The book says create first an HTTPSession Object and from there call the stateful EJB.
I'm a bit confused because, I'm missing some best practice guide from where to initiate such calls.
Can somebody please point me in the right direction?
Kind Regards
Bruno
Edited by: zajoho on Oct 30, 2008 11:14 PM

Hi Bruno,
The main issue with the combination of stateful session beans and servlets is the servlet threading model.
It is dangerous to store a stateful session bean reference in servlet instance state, since the servlet instance
can be accessed concurrently, yet a stateful session bean reference is intended to be used by only one
client.
As you point out, one alternative is to store the reference in the HttpSession. That associates the reference
with a particular client, which matches the stateful session bean programming model.

Noticing a lot of database index fragmentation yet no Health Analyzer alerts...? Best practice for database maintenance in 2013?

Could someone point me to a document for best practices for database maintenance with SharePoint 2013? I have read the 2010 document, but I'm hoping their is an updated one that I'm just missing.
My problem is that our DBA recently noticed that many of our SharePoint databases have high index fragmentation. I have the Health Analyzer rules enabled for index fragmentation and they run daily, but I've never received an alert despite the majority
of our databases having greater than 40% fragmentation and some are even above 95%.
Obviously it has our attention now and we want to get this addressed. My understanding (which I now fear is at best incomplete, more likely just plain wrong) was that a maintenance plan wasn't needed for index fragmentation in 2010/2013 like it was
in 2007.
Thanks,
Troy

It depends. Here are the rules for that job:
Sampled mode
Page count >24 and avg fragmentation in percent >5
Or
Page count >8 avg page space used in percent < fill_factor * 0.9 (Fill Factor in SharePoint 2013 varies from 80 to 100 depending on the index, it is important not to adjust index fill factors)
I have seen cases where the indexes are not automatically managed by the rule and require a manual defragmentation with a Full Scan, instead of Sampled. Once the Full Scan defrag completed, the timer job started handling the index fragmentation automatically.
Trevor Seward
Follow or contact me at...
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This post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

Best practice for linking fields from multiple entity objects

I am currently transitioning from PHP to ADF. I'm looking for the best practice for linking data from multiple entity objects.
Example:
EO 'REQUESTS' has fields: req_id, name, dt, his_stat_id, her_stat_id
EO 'STATUSES' has fields: stat_id, short_txt_descr
'REQUESTS' is linked to EO 'STATUSES' on: STATUSES.stat_id = REQUESTS.his_status_id
'REQUESTS' is also linked to EO 'STATUSES' on: STATUSES.stat_id = REQUESTS.her_status_id
REQUESTS.his_status_id is independent of REQUESTS.her_status_id
When I create a VO for REQUESTS, I want to display: REQUESTS.name, REQUESTS.dt, STATUSES.short_txt_descr (for his_stat_id), STATUS.short_txt_descr (for her_stat_id)
What is the best practice for accomplishing this? It appears I could do it a few different ways:
1. Create the REQUESTS VO with a LOV for his_stat_id and her_stat_id
2. Create the REQUESTS VO with the join to STATUSES performed within the query for the VO. This would require joining on the STATUSES EO twice (his_stat_id, her_stat_id)
3. I just started reading about View Links - would that somehow do what I'm looking for?
I also need to be able to update his_status_id and her_status_id through the by selecting a STATUSES.short_txt_descr from a dropdown.
Any suggestions on how to approach such a stupidly simple task?
Using jDeveloper 11.1.2.2.0 if that makes a difference in the solution.
Thanks ahead of time,
CJ

CJ,
I vote for solution 1 as it's just your use case. As you said you what to update the his_status_id and her_status_id through the by selecting a STATUSES.short_txt_descr by a drop down. This is exactly the LOV solution.
ViewLinks are used fro master detail navigation (which you don't do here) and Joining the data make it difficult to update (and you still need a LOV for the drop down box.
Timo

What is the best IDE for database programming in java?

im just new to java, i have experience in powerbuilder and visual basic. Im looking for an IDE for JAVA Database Programming that have same ease of use of the GUI builder of visual basic and power of the Datawindow in Powerbuilder.
What is the best IDE for database programming in java?

hey sabre why not just help me? instead of posting
annoying replies. You want me to browse all the post
two weeks ago to find what im looking for. stoopsMost regulars to this forum find X-posting annoying. Since you are lazy and want me to search the posts of the last couple of week for you, I find you very annoying.

Best Practice for Removing Zeroes from Database

Does anyone have some clever bits of code or best practices for evaluating a database and instances of zeroes? I'm working on cleaning up our rules file and am thinking the best way to start would be to write some code to look for zeroes and write them to a log file. This would at least indicate if there was even a problem with zeroes (which there may or may not be).
Any suggestions out there / utilities / code samples?
Thanks.

We accomplished this using data extracts from a subset of scenarios/years/entities/accounts to ensure that all of our potential rules could be checked to ensure they were not writting zero's. This worked pretty well for our purposes, a text editor called EmEditor allows for VB macros in it pretty easily and we could write a quick macro to check for strings ending in "; 0." You may also want to review your check box of calculated in your extract and see if the zeros are a result of calculations. A rule output could work pretty well, although it would take some defining as you would have to write it out in a sub and make sure that you capture the data of all subroutines if your zero's are rule driven or actual inputs. May want to review some if you have very small insignificant values getting written, seen items that have one value 13 places to the right of the decimal that were not really signficant.
JTF

Best Practices for Removing Shots from BDMV folder

CS6 Production Premium Suite
Win7x64
Canon XA10
I would appreciate feedback on the best practices for the following situation:
Using Windows Explorer, I copy the BDMV folder from the XA10 to my Talk2 project folder.
The BDMV folder has three one hour shots (talks) where each shot is one hour called Talk1, Talk2, and Talk3.
Each shot consists of several MTS files in the STREAM folder since MTS files have a maximum file size so a new MTS file is created when a given MTS file reaches the maximum file size.
Since I only want to have Talk2 stuff in my Talk2 project folder, I need to remove the Talk1 and Talk3 stuff from the BDMV folder.
I delete the Talk1 and Talk3 MTS files from the STREAM folder.
I delete the Talk1 and Talk3 CPI files from the CLIPINF folder.
I leave the PLAYLIST folder as is.
Using the Media Browser, I import Talk2 (which consists of two MTS files).
I edit the clip.
This procedure seems to work, but I do not know if there are any "got you" issues.
Thanks in advance.

Oh, don't do it that way. I know a lot of people do, heck, my boss does, but it's just asking for trouble.
Treat your card as if it was your original tape master (because it is). It is the most important thing you have. Don't delete or move any part of it.
If you want to break up the talks, do it as you shoot them. Use separate cards for each talk and archive each one separately. There is too much valuable information in the structure of the card format. You may not need it now but your editing program may need it later.
Hard drive space is cheap but digital recordings are priceless

Best practices for logging results from Looped steps

Hi all
I would like to start a discussion to document best practices for logging results (to reports and databases) from Looped Steps
As an application example - let's say you are developing a test for one of NI's analog input or output cards and need to measure a voltage across multiple inputs or outputs.
One way to do that would be to create a sequence that switches the appropriate signals and performs a "Voltage Measurement" test in a loop.
What are your techniques for keeping track of the individual measurements so that they can be traced to the individual signal paths that are being measured?
I have used a variety of techniques such as
i )creating a custom step type that generates unique identifiers for each iteration of the loop. This required some customization to the results processing . Also the sequence developer had to include code to ensure that a unique identifier was generated for each iteration
ii) Adding an input parameter to the test function/vi, passing loop iteration to it and adding this to Additional results parameters to log.

I have attached a simple example (LV 2012 and TS 2012) that includes steps inside a loop structure as well as a looped test.
If you enable both database and report generation, you will see the following:
1) The numeric limit test in the for loop always generates the same name in the report and database which makes it difficult to determine the result of a particular iteration
2) The Max voltage test report includes the paramater as an additional result but the database does not include any differentiating information
3) The Looped Limit test generates both uniques reports and database entries - you can easily see what the result for each iteration is.
As mentioned, I am seeking to start a discussion for how others handle results for steps inside loops. The only way I have been able to accomplish a result similar to that of the Looped step (unique results and database entry for each iteration of the loop) is to modify the process model results processing.
Attachments:
test.vi ‏27 KB
Sequence File 2.seq ‏9 KB

What are the best practices for Database management and performance tuning?

Hello,
I want to ensure that I am using the best practices for managing and maintaining our Database.
Is there any documentation out there that outlines how to maintain and ensure top performance out of our database?
Thank you!
John Sefton

I appreciate the responses, however this is not the information I am looking for.
I am specificaly looking for best practices invloving the managment and performance tuning.
Example: are their tools that I can install that will monitor the size and response time of the database and alert me if there is degradation in performance?
Are there specific periodic activities I should be doing to garuntee that my database will continue to function that way it is supposed to?
Or is this a fire and forget solution that does not need this attention?

Best Practice For Database Parameter ARCH_LAG_TARGET and DBWR CHECKPOINT

Hi,
For best practice - i need to know - what is the recommended or guideline concerning these 2 Databases Parameter.
I found for ARCH_LAG_TARGET, Oracle recommend to setup it to 1800 sec (30min)
Maybe some one can guide me with these 2 parameters...
Cheers

Dear unsolaris,
First of all if you want to track the full and incremental checkpoints, make the LOG_CHECKPOINT_TO_ALERT parameter TRUE. You will see the checkpoint SCN and the completion periods.
Full checkpoint is being triggered when a log switch happens and checkpoint position in the controlfile is written in the datafile headers. For just a really tiny amount of time the database could be consistent eventhough it is open and in read/write mode.
ARCH_LAG_TARGET parameter is disabled and set to 0 by default. Here is the definition for that parameter;
http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/initparams009.htm
If you want to set this parameter up the Oracle recommends it to be 1800 as you have said. This can subject to change from database to database and it is better for you to check it by experiencing it.
Regards.
Ogan

Best practice for workflow triggering from Web Dynpro UI

Hello, workflow community!
I'm working on a task which allow to trigger the workflow by clicking a button in Web Dynpro UI. As always, there are multiple ways to do that, for instance, to use SAP Workflow API (SAP_WAPI_START_WORKFLOW) or to raise an event upon the button click, which will be caught by workflow template.
In my opinion, the optimal solution is to call FM, which will call ABAP-class, raising an event, which, in turn, will be caught by workflow template. In this case, FM will service kind of wrapper, where we can implement some additional checks if needed.
But the question is what approach is the best practice — to raise an event or use SAP_WAPI_*?
Thanks.

let combine, use SAP_WAPI_CREATE_EVENT
usually I would not recommend creating a workflow directly (SAP_WAPI_START_WORKFLOW) since when I look for workflows in a system I usually start from SWE2 (the event linkage) which uses events so the workflow you start by SAP_WAPI_START_WORKFLOW will not be seen there, also SWE2 gives you better control for starting the workflow, you can easily deactivate an event linkage. finding where you called the workflow by SAP_WAPI_START_WORKFLOW will be more difficult and deactivation will require a code change.
so use events, and start them by SAP_WAPI_CREATE_EVENT
Also pay attention that you have a check function module option in SWE2.

Best practice for database migration in 11g

Hello,
Database migration is required due to OS change. Here, I have two database instances say A and B in the old server where RDBMS_VERSION is 11.1.0.7.0. They need to be migrated into a new OS where the oracle has been installed with version 11.2.0.2.0.
Since all data + objects need to be migrated into the new server, I want to know what the best practice is and how to do that. Thanks in advance for your necessary guidance.
Thanks and Regards,
Prosenjit

Hi Prosenjit,
you have some options.
1. RMAN Restore: you can restore your database via rman to the new host, and then upgrade it.
Please follow instruction from MOS Note: RMAN Restore of Backups as Part of a Database Upgrade (Doc ID 790559.1)
2. Data Guard: check the MOS Note: Mixed Oracle Version support with Data Guard Redo Transport Services (Doc ID 785347.1)
3. Full Export / Import (DataPump)
Borys

Best practice for database move to new disk

Good morning,
Hopefully this is a straight forward question/answer, but we know how these things go...
We want to move a SQL Server Database data file (user database, not system) from the D: drive to the E: drive.
Is there a best practice method?
My colleague has offered "ALTER DATABASE XXXX MODIFY FILE" whilst I'm more inclined to use "sp_detach_db".
Is there a best practice method or is it much of a muchness?
Regards,
Andy

Hello,
A quick search on MSDN blogs does not show any official statement about ALTER DATABASE – MODIFY FILE vs ATTACCH. However, you can see a huge number of article promoting and supporting
the use of ALTER DATABASE on any scenario (replication, mirroring, snapshots, always on, SharePoint, service broker).
http://blogs.msdn.com/b/sqlserverfaq/archive/2010/04/27/how-to-move-publication-database-and-distribution-database-to-a-different-location.aspx
http://blogs.msdn.com/b/sqlcat/archive/2010/04/05/moving-the-transaction-log-file-of-the-mirror-database.aspx
http://blogs.msdn.com/b/dbrowne/archive/2013/07/25/how-to-move-a-database-that-has-database-snapshots.aspx
http://blogs.msdn.com/b/sqlserverfaq/archive/2014/02/06/how-to-move-databases-configured-for-sql-server-alwayson.aspx
http://blogs.msdn.com/b/joaquint/archive/2011/02/08/sharepoint-and-the-importance-of-tempdb.aspx
You cannot find the same about ATTACH. In fact, I found the following article:
http://blogs.msdn.com/b/sqlcat/archive/2011/06/20/why-can-t-i-attach-a-database-to-sql-server-2008-r2.aspx?Redirected=true
Hope this helps.
Regards,
Alberto Morillo
SQLCoffee.com

Best approach for RFC call from Adapter module

What is the best approach for making a RFC call from a <b>reciever</b> file adapter module?
1. JCo
2. Is it possible to make use of MappingLookupAPI classes to achieve this or those run in the mapping runtime environment only?
3. Any other way?
Has anybody ever tried this? Any pointers????
Regards,
Amol

Hi ,
The JCo lookup is internally the same as the Jco call. the only difference being you are not hardcoding the system related data in the code. So its easier to maintain during transportation.
Also the JCO lookup code is more readable.
Regards
Vijaya

Best Practices for configuring ICMP from the outside

Question,
Are there any best practices or best recommendations on how ICMP should be configured from the outside? I have been cleaning up the rules on our ASA as a lot were simply ported over years ago when we retired our PIX. I noticed that there is a rule to allow ICMP any any and began to wonder how this works when the rules above are specific IP addresses and specific ports. This in thurn started me looking to see if there was any documentation or anything to help me determine a best practice. Anyone know of anything?
As a second part how does this flow on a firewall if all the addresses are natted? It the ICMP traffic simply passed through the NAT and the destiantion simply responds?
Brent

Here you go, bro!
http://checkthenetwork.com/networksecurity%20Cisco%20ASA%20Firewall%20Best%20Practices%20for%20Firewall%20Deployment%201.asp#_Toc218778855
access-list inside permit icmp any any echo
access-list inside permit icmp any any echo-reply
access-list inside permit icmp any any unreachable
access-list inside permit icmp any any time-exceeded
access-list inside permit icmp any any packets-too-big
access-list inside permit udp any any eq 33434 33464
access-list deny icmp any any log
P/S: if you think this comment is useful, please do rate them nicely :-)

Best practice for database calls from Java components?

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