Dealing with 1Million of records

i'm connecting to DB2 via JDBC. the DB i'm using is quite large. my question is will i get OutOfMemoryError if i just do a simple select such as
"select * from bigTable"
since this table contain 1Million records.
or is JDBC smart enough not to hold every record in the memory but fetching the record as they are used(after calling resultset.next())?
i see method Statement.setFetchSize(int size). what does it do?
if JDBC is not smart as i thought then the only way i can prevent OutOfMemoryError is to select a batch of records(i.e. 100/batch)?
any suggestions?

Hi,
Basically, I suggest that partition that big table properly.
one million records in one table might cost lots of resources
while database operate that table. It is possible to degrade
the performance of that table operation as well. Database is
good for us to deal with the large amount of data. But it needs
to be well controlled for the best performance.
good luck,
Alfred Wu

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Hi experts and professionals,
I am trying to automate testing of our solutions by eCATTs and so far i have not been able to find solution for following problem.
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Dear Igor,
Your issue is caused by the "screen check" which eCATT processes here.
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Maybe this can improve your solution.
Kind Regards
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I recently got a bass guitar (fender p-bass) and its
a little noisy. There is an electronic hum/buzz when
my fingers are not touching the strings. I had my
guitar tech look at it and he said the noise is
normal. However, I plan on using this bass to record
direct and when I plug into Logic this buzz/hum is
audible. If I turn the tone knob on the bass down
completely, the noise goes away. But when I start to
turn the tone knob up at all the noise get louder.
My question is if this is a common problem with
instruments (bass, guitar, etc) and is it normal to
use a plug-in to eradicate this noise (like a noise
gate, or something else)? Also, does anyone else have
any ideas on how to work with this buzz/hum? Thanks.
Hi JackQ,
I had some experience a few years back with one of these basses,same model.Basically,the hum you are hearing is a grounding problem.Your tech does not know how to fix it,that's why he said it's "normal".It's not normal.
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Handling
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>
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Why not add a WHERE clause to your statment to filter records having the name of the file in the first record. In this case you'd better use PreparedStatement and set the file name as statement parameter
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Mike

I'm trying to transfer music from iTunes on an old PC that uses an external storage device to a new PC (Windows 7) that will use that same external storage device. I am also dealing with new iTunes 11. How do I do this?? What folder does iTunes use?

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Here are typical layouts for the iTunes folders:
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In the simplest cases you copy the entire iTunes folder from <User's Music> on the source computer to <User's Music> on the target machine, install iTunes, and it "just works"TM.
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tt2

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How to deal with the rejected stock if it is rjected by QC

Dear All,
please let me know how to deal with the rejected stock from Quality point of view.i.e., for incoming materails and Finished if returned from customer
Regards,
P.Vijaya

hi
if material is rejected for incoming material then you can create Notification for incoming material due to you can return back material with print for that you have to record defects in result recording. in T-code QM02 if result is recorded with defects. or you can create with Qm01.against vendor
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clients, is typically dumped into a single table consisting of 200+ varchar(x) fields. There are no indexes or primary keys on the tables in these databases, and the tables in each database contain several hundred million rows (for example one table
contains 650 million rows of data and takes up a little over 1 TB of disk space, and we receive weekly feeds from our client which adds another 300,000 rows of data).
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My experience is primarily in applications development. I know enough about SQL Server to perform some basic performance tuning and write reasonably efficient queries; however, I'm not accustomed to having to completely overhaul such a poor design
with such a large volume of data. We have already tried to add an identity column and set it up as a primary key, but the server ran out of disk space while trying to implement the change.
I'm looking for any recommendations on how best to implement changes to the table(s) housing such a large volume of data. In the short term, I'm going to need to be able to perform a certain amount of data analysis so I can determine the proper data
types for fields (and whether any existing data would cause a problem when trying to convert the data to the new data type), so I'll need to know what can be done to make it possible to perform such analysis without the process consuming entire days to analyze
the data in one or two fields.
I'm looking for reference materials / information on how to deal with the issues, particularly when a large volumn of data is involved. I'm also looking for information on how to load large volumes of data to the database (current processing of a typical
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Hi everybody,
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null
Message was edited by:
Mario Müller

Hello Mario,
A very good question. This is what is called as modeling.
I shall give you an approach into this. There is no right and wrong way of doing it. Probably, only a more desriable or better way !!
How you model it depends on what your object is.
If you have an internal table of sales orders, still in real world the services or methods are on a single sales order. So the object here is a single sales order.
=> I would model the class to deal with one sales order. (this more or less answers your question)
2. Just to take this a little further.
What I would do is have 3 different layers of abstraction.
A UI class, a business layer class and a DB class.
UI class can only talk to business class, business can talk to DB class. And the DB class is a static class.
The UI class is only responsbile to do the display job.
The UI will display multiple sales orders for eg, so u have an internal table of instances to the business layer.
The business layer itself does validation, processing for each sales order.
The business layer can also have soem static methods (or class methods) to select multiple records from Database. This is static, as it is not acting on one sales order, but you are returning multiple. This method should simply call a method of the DB layer.
The DB layer is meant only to read from DB and write to DB.
Hope this helps. Remember to reward points, if it does.
For more highlights into this, refer to some material on design approach or design pattern.
Best Rgds,
Prashanth.
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I tried to record the entire tape when using the option of not aborting on dropped frames. I recorded the entire video but not it gets more and more out of sync later and later in the video.
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Hi(Bonjour)!
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How to deal with variable length data struct in C/JNI

I have another JNI related question. How do you handle variable length
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Basically, I have a backend in C which has records but we don't know
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typedef struct rec_list_s {
int rec_list_cnt;
rec_list_data_t rec_list_data[1];
} rec_list_t;
int rec_list_show(void handle, rec_list_t *list_ptr);
/* Code snippet for rec_list_show */
int rec_list_show(void handle, rec_list_t *list_ptr)
rec_list_t *ptr;
sz = sizeof (rec_list_t) +
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ptr = malloc(sz);
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return (0);
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it. How do i pass a pointer to a pointer from Java? I tried in the
native C code for JNI to return the pointer to pointer as a result
and store in a member in the Java class rec_list_t and then I pass
that to JNI call for rec_list_show. The C backend code was fine
since it got the pointer to pointer but Java become unhappy when
the object it was referencing changed memory location (I suspect
the garbage collection becomes unhappy).
So what would be a good way to deal with this kind of code?
Thanks,
Sunay
Edited by: st9 on Aug 30, 2010 5:47 PM

I did not imply that you don't know C but you are implying that I don't understand C. Perhaps
google Sunay Tripathi and click I am feeling lucky so that we don't get into teaching C
discussions :) On the other hand, I am definitely looking for someone to teach me Java
otherwise I wouldn't be asking.
Anyway, let me explain again. The sample function rec_list_show() runs on the backend. It
is a different process with a different VM space. It of course knows the size of the array
and what to fill in. As a caller to that API (which is a separate process), I don't know
what that size is but I need to get the size and corresponding data in one shot because
the backend locks the table when its providing me the info to make sure its synchronous.
Now I (the Java process) needs to get that count and data in one shot. Since the C library
underneath me (wrapped around my JNI interface) has private IPC mechanism to copy
the contiguous memory from the backend into my memory space, all I need is to provide
a pointer to a pointer which gets filled in by backend and is available to my process. So
my equivalent C frontend just passes a pointer to a pointer and casts the return value in
rec_list_t. The rec_list_cnt tells it how many members it got. The first member is part of
the struct itself but then following members are right after.
Another way to help you understand this is with this code snippet from front end C program
rec_list_t     *ptr, *save_ptr;
rec_list_data_t *data_ptr;
int          cnt;
save_ptr = ptr = malloc(sizeof(rec_list_t));
rec_list_show(handle, &ptr);
assert(save_ptr != ptr);
cnt = ptr->rec_list_cnt;
for (i = 0; i < cnt; i++) {
     data_ptr = &ptr->rec_list_data;
Notice the assert(). Also notice the for loop. How do I expect to walk more that one
member when rec_list_data is a fixed size array of one member?typedef struct rec_list_s {
     int               rec_list_cnt;
     rec_list_data_t          rec_list_data[1];
} rec_list_t;
Anyway, I do understand that Java will not allow me to get a reference to a long and
how Java memory management works. But the JNI native implementation is C
and I was wondering if people have managed to do some tricks there between C
and Java.

How to deal with this problem?

How to deal with this problem?
We plan to use Oracle Coherence (In Memory Data Grid) for a large-scale application. In order to keep the database table data in Coherence caches, we will create all the corresplonding Java objects (entities) and construct the persistence system using JPA/EclipseLink+JDBC. In this way, any in-memory object update will be persisted to the corresponding database tables.
The problem is that some existing application codes are updating these database tables directly now. If the direct-database-table update is not permmited in the persistence environment, we have to discard most of the existing application scripts.
I want to know, in this situation, should I discard most of the existing scripts?
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Allowing writes from both cache & DB is possible with its own set of issues.
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