I have a report which creates a background job. The user can decide if the job should be periodic or not. Now I want to show information about the actual job. So how can I find out the JOBCOUNT of the following job (periodic) after the old one was executed?
I guess SAP would store that information only if it's needed for internal operations.
I think there's no need, so you won't find that information stored anywhere.
You might do an approximation yourself by searching the currently-scheduled job which has its creation date/time (TBTCO/TBTCS) close to the end of a previous one (TBTCO), with same characteristics (including it(s) step(s) in table TBTCP)... You may get inspired from a few programs prefixed BTCAUX (04, 13).
If you do this piece of code, don't hesitate to post it as a separate answer, that could be very helpful for future visitors.
You can use BP_JOB_SELECT FM for that, it mainly resembles SM37 selection parameters.
Set JOBSELECT_DIALOG param to N to omit GUI screen and fill in job name into JOBSEL_PARAM_IN-JOBNAME param, these are the only two mandatory parameters.
The JOBCOUNT value resides in JOBSELECT_JOBLIST table:
Related
I am new to optaplanner, and right now I focus on trying to understand the project job scheduling. I trying to run this examples using the sample data from optaplanner manual like in this picture below:
I have some question about the domain classes in this example :
What is the difference of GlobalResource and LocalResource? In the examples, all the resource is GlobalResource right? Then what the use of LocalResource?
There are 3 JobType: SOURCE, STANDARD, SINK, what is the meaning each one of them? It is SOURCE mean the job should be the first to start before the others? STANDARD mean it is should be run after the predecessor job finished but not after the SINK job? SINK mean it is the last job to do after all job finished?
What is the meaning of property releaseDate and criticalPathDuration in Project class? If we related it with the picture above, what is the value for project Book1 and Book2?
What is the meaning of requirement in ResourceRequirement?
I will be really thankful if someone can help me create the xml sample data like in optaplanner distribution, cause it will help me more faster to understand this example. Thanks & Regards.
A LocalResource belongs to a specific Project, a GlobalResource is shared between the projects.
So a LocalResource only has to be worry about being used by other jobs in the same Project too, while a GlobalResource has to worry about all other tasks.
That's an implementation trick. The source and sink jobs are dummy's basically. Because a project might start with multiple jobs in parallel, a SOURCE job is put in front of it, to have a single root. Same for the end: it can end with multiple, so a SINK job is put after it, to have a single tail. This makes it easier and faster to determine makespan etc.
IIRC, releaseDate is the first date we are allowed to start the first job. For example: you have to create a book, but you 'll only get the actual final content next Monday, so the releaseDate is next Monday (you can't start any work before that date).
The criticalPathDuration is a theoretical minimum duration (if we can happily ignore resources IIRC). For example: if job A takes 5 days and job B takes 2 days and B has to be done AFTER A, then the critical path duration is 7 days. Adding job C which takes 1 day and can be done in parallel with the others, don't affect that.
ResourceRequirement is the many2many relationship between ExecutionMode and Resource. Remember that ExecutionMode belongs to a specific Job. For example: doing job A in executionMode A1 requires 1 laborers and 5 days. Doing job A in executionMode A2 requires 2 laborers and 3 days.
I have two Tables:
Articles(artID, artContents, artPublishDate, artCategoryID, publisherID).
ArticleUpdated(upArtID, upArtContents, upArtEditedData, upArtPublishDate, upArtCategory, upArtOriginalArticleID, upPublisherID)
A user logging in to the application and update an article's
contents at (artContents) column. I want to know about:
Which Changes the user made to the article's contents?
I want to store both versions of the Article, Original version and Edited Version!
What should I do for doing above two task:
Any necessary changes into the tables?
The query for getting exact edited data of (artContents).
(The exact edited data means, that there may 5000 characters in the coloumns, the user may edit 200 characters in the middle or somewhere else in column's characters, I want exact those edited characters, before of edit and after of edit)
Note: I am using ASP.NET with C# for Developing
You are not going to be able to do the exact editing using SQL. You need an algorithm such as the Unix diff on files (which works on the line level). At the character level, the algorithm would be some variation of Levenshtein distance. If diff meets your needs, you could download it, write a stored-procedure to call it, and then use it in the database. This would be rather expensive.
The part of your question of maintaining the different versions is much easier. I would add two colmnns EffDate and EndDate onto each record. You can get the most recent version by looking for EndDate is NULL and find the version active at any given time. Merge is generally useful for maintaining such a table.
Basically this type for requirement needs custom logging.
The example what you have provided i.e. "The exact edited data means, that there may 5000 characters in the coloumns, the user may edit 200 characters in the middle or somewhere else in column's characters, I want exact those edited characters, before of edit and after of edit"
Can have a case that user updates particular words from different place from the text.
You can use http://nlog-project.org/ for logging, its a fast and robust tool that normally we use for doing .net logging.
Also you can take a look
http://www.codeproject.com/Articles/38756/Two-Simple-Approaches-to-WinForms-Dirty-Tracking
Asp.net Event for change tracking of entities
What would be the best way to implement change tracking on an object
Above urls will clear some air, on how to do it.
You would obviously need to track down and store every change.
I'm optimizing the memory load (~2GB, offline accounting and analysis routine) of this line:
l2 = Photograph.objects.filter(**(movie.get_selectors())).values()
Is there a way to convince django to skip certain columns when fetching values()?
Specifically, the routine obtains all rows of the table matching certain criteria (db is optimized and performs it very quickly), but it is a bit too much for python to handle - there is a long string referenced in each row, storing the urls for thumbnails.
I only really need three fields from each row, but, if all the fields are included, it suddenly consumes about 5kB/row which sadly pushes the RAM to the limit.
The values(*fields) function allows you to specify which fields you want.
Check out the QuerySet method, only. When you declare that you only want certain fields to be loaded immediately, the QuerySet manager will not pull in the other fields in your object, till you try to access them.
If you have to deal with ForeignKeys, that must also be pre-fetched, then also check out select_related
The two links above to the Django documentation have good examples, that should clarify their use.
Take a look at Django Debug Toolbar it comes with a debugsqlshell management command that allows you to see the SQL queries being generated, along with the time taken, as you play around with your models on a django/python shell.
I'm building a system which will collect data about an industrial process, which is externally controlled. Those datas will be used to build usage statistics for various components of the system.
Simplified example: there's a heater that is turned on and off, and I get notified when it happens. I need to log this, and based on these data be able to answer questions like "How long has the heater been on last month?"
What I came up with is to create a table in which I insert a line each time a state change happens, include a timestamp.
However, it seems to me that it will require quite a lot of after-processing, eg to answer the example question above. I see no way to extract this kind of answer with just SQL.
Question: is there a better suited, more effective "storage pattern" that what I describe here?
Thanks.
You could store the time the heater was on, rather than the discrete on/off events. Use time_on and time_off columns to track when the heater was turned on and off respectively, and then subtract time_on from time_off to get the duration.
When the heater is turned on:
insert into heater_usage (time_on, time_off) values (now(), null);
When the heater is turned off:
update heater_usage set time_off = now() where time_off is null;
Use unique constraints to insure no two rows can have null for time_off, as a basic check to make sure you don't leave "dangling" records with no time_off if your script isn't invoked properly. You could check for those when the heater is turned on, and remove them.
To sum the total time on:
select sum(time_off - time_on) from heater_usage;
I dont think you have provided enough information to be able to propose a design.
I am sure that you are storing more than just one event type; is it a few, or is it a very large amount.
how different is the data that needs to be stored for each event type?
how often will this system need to be changed? will you have to edit or add event types regularly or rarely?
is this a system that has to be flexible to the type of data that an event produces?
that said, you effectively have two main types of design possibilities:
create a unique table for every event type that explicitly captures data for the event type OR create a limited number of tables that can store data for many event types which have a column containing xml, or serialised data of some form.
the first is less flexible, the second requires more post processing.
My java/groovy program receives table names and table fields from the user input, it queries the tables in SAP and returns its contents.
The user input may concern the tables CDPOS and CDHDR. After reading the SAP documentations and googling, I found these are tables storing change document logs. But I did not find any remote call functions that can be used in java to perform this kind of queries.
Then I used the deprecated RFC Function Module RFC_READ_TABLE and tried to build up customized queries only depending on this RFC. However, I found if the number of desired fields I passed to this RFC are more than 2, I always got the DATA_BUFFER_EXCEEDED error even if I limit the max rows.
I am not authorized to be an ABAP developer in the SAP system and can not add any FM to existing systems, so I can only write code to accomplish this requirement in JAVA.
Am I doing something wrong? Could you give me some hints on that issue?
DATA_BUFFER_EXCEEDED only happens if the total width of the fields you want to read exceeds the width of the DATA parameter, which may vary depending on the SAP release - 512 characters for current systems. It has nothing to do with the number of rows, but the size of a single dataset.
So the question is: What are the contents of the FIELDS parameter? If it's empty, this means "read all fields." CDHDR is 192 characters in width, so I'd assume that the problem is CDPOS which is 774 characters wide. The main issue would be the fields VALUE_OLD and VALUE_NEW, both 245 Characters.
Even if you don't get developer access, you should prod someone to get read-only dictionary access to be able to examine the structures in detail.
Shameless plug: RCER contains a wrapper class for RFC_READ_TABLE that takes care of field handling and ensures that the total width of the selected fields is below the limit imposed by the function module.
Also be aware that these tables can be HUGE in production environments - think billions of entries. You can easily bring your database to a grinding halt by performing excessive read operations on these tables.
PS: RFC_READ_TABLE is not released for customer use as per SAP note 382318, and the note 758278 recommends to create your own function module and provides a template with an improved logic.
Use BBP_RFC_READ_TABLE instead
There is a way around the DATA_BUFFER_EXCEED error. Although this function is not released for customer use as per SAP OSS note 382318, you can get around this issue with changes to the way you pass parameters to this function. Its not a single field that is causing your error, but if the row of data exceeds 512 bytes this error will be raised. CDPOS will have this issue for sure!
The work around if you know how to call the function using Jco and pass table parameters is to specify the exact fields you want returned. You then can keep your returned results under the 512 byte limit.
Using your example of table CDPOS, specify something like this and you should be good to go...(be careful, CDPOS can get massive! You should specify and pass a where clause!)
FIELDS = 'OBJECTCLAS'....
FIELDS = 'OBJECTID'
In Java it can be expressed as..
listParams.setValue(this.getpObjectclas(), "OBJECTCLAS");
By limiting the fields you are returning you can avoid this error.