Programmically update a SQLCE database file

Hello All,
I have two programs that I want to share the same database so that the tables that contain duplicate information don't have to be replicated if I provide two different databases (one for each program).
When I deploy these applications, and I make changes (adding tables and adding fields to existing tables) I'd like to verify that these changes are in my client's database and if not add them.
For example, I sell a program to a client. Later in the year, I make changes to the database in terms of tables and fields. If the client downloads the latest update to the program, and the program refers to a table or field that isn't in their current database,
their program will error out.
Can I check a SQLCE database or items and add things if they are not there?
ADawn
ADawn

You can Query the INFORMATION_SCHEMA views for object exsistance and take corrective action
(ie run ALTER TABLE ADD .. etc)
You can also use my scripting API from exportsqlce.codeplex.com if you are insecure about how to Query INFORMATION_SCHEMA views.
Please mark as answer, if this was it. Visit my SQL Server Compact blog http://erikej.blogspot.com

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Identify database file usage

I would like to identify over the last X seconds how much data has been written and read from each database file by SPID, is this possible? I want gather information on our busiest files and processes.
Id like to be able to do this in TSQL rather than using profiler.

Hi Jameslester,
We can capture the information about reading and writing transaction log file via DMV or SQL Server Profiler when your perform any database activity. We will run a few DML scripts to check how data insertion, updating or deletion is logged in the database
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Is there a size limit on the iPod for the song database file ?

I have been running into the same issue for the last 2 weeks: Once I exceed 110 GB on my iPod Classic 160 GB, iTunes is no longer able to update the database file on the iPod.
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Is there a size limit for the database file on the iPod ?
I am making excessive use of the 'comments' field in every song that I load to the iPod. This increases the size of the database file.
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did you experience some crashing of the ipod as well? do you know how many separate items you had?

Edit the [LDF] database file

Hi,
I'm searching a way that can edit the database file *.ldf, cause some customers wouldn't put the Signal_endcoding_types in the ldf file. I need a way to save the "encoding" in the file with labview UI. I've found some old APIs for ldf file, but I've tried out, it seems like, that they only works on old versions. The version of my ldf file is LIN_protocol_version = "2.0"; LIN_language_version = "2.1"; does any one could tell me if there's any way that can realise my target.
Thank you in advance
best regards,
Melo
Solved!
Go to Solution.

Do you actually want to edit the LDF file? Because if so there is nothing NI currently provides that will work for you. If you want to use the LDF in XNet, and you want to modify settings imported from the LDF then you can use the XNet API to achive this. When you use XNet you import the LDF (or other database files) and then you can edit the database, but this doesn't edit the LDF. This edits the database that XNet uses, which was started by importing the LDF.
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Unofficial Forum Rules and Guidelines - Hooovahh - LabVIEW Overlord
If 10 out of 10 experts in any field say something is bad, you should probably take their opinion seriously.

How to stop BDB from Mapping Database Files?

We have a problem where the physical memory on Windows (NT Kernel 6 and up, i.e. Windows 7, 2008R2, etc.) gets maxed out after some time when running our application. On an 8GB machine, if you look at our process loading BDB, its only around 1GB. But, when looking at the memory using RAMMAP, you can see that the BDB database files (not the shared region files) are being mapped into memory and that is where most of the memory consumption is taking place. I wouldn't care normally, as memory mapping can have performance and usability benefits. But the results are the system comes to a screeching halt.   This happens when we are inserting results in high order, e.g. 10s of millions of records in a short time frame.
I would attach a picture to this post, but for some reason the insert image is greyed out.
Environment open flags: DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_TXN | DB_INIT_MPOOL | DB_THREAD | DB_LOCKDOWN | DB_RECOVER
Database open flags: DB_CREATE | DB_AUTO_COMMIT

An update for the community
Cause
We opened a support request (SR) to work with Oracle on the matter. The conclusion we came to was that the main reason for the memory consumption was the Windows System Cache. (For reference, see this http://support.microsoft.com/kb/976618) When opening files in buffered mode, the equivalent of calling CreateFile without specifying FILE_FLAG_NO_BUFFERING, all I/O to a file goes through the Windows System Cache. The larger the database file, the more memory is used to back it. This is not the same as memory mapped files, of which Berkeley will use for the region files (i.e. the environment.) Those also use memory, but because they are bounded in size, will not cause an issue (e.g. need a bigger environment, just add more memory.) The obvious reason to use the cache is for performance optimizations, particularly in read-heavy workloads.
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Time is important, because Windows needs time to transition active pages to standby pages which decreases the amount of physical memory.   What we found is that when our DB was installed on FLASH disk, we could generate a lot more I/O and our tests could run in a fraction of the time, but the memory would get close to 100%. If we ran those same tests on slower disk, while the result was the same, i.e. inserted 10 million records into the data, the time takes a lot long and the memory utilization does not approach even close to 100%. Note that we also see the memory consumption happen when we utilize the hotbackup in the BDB library. The reason for this is obvious: In a short amount of time we are reading the entire BDB database file which makes Windows utilize the system cache for it. Total amount of memory might be a factor as well. On a system with 16GB of memory, even with FLASH disk, we had a hard time reproducing the issue where the memory climbs.
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Workaround
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Hi,
I am using Kodo JDO 3.0.2 together with HSQLDB (non-cached, same process).
It
runs fine. However, after having used a SQL tool such as Aqua Data Studio
to
inspect the database my Java code complains with the message
"kodo.util.FatalDataStoreException: Wrong database file version". I have
to
rebuild the database and extend my classes again to get rid of this error.
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Thanks for your help
--Bruno

Marc,
It was indeed a version mismatch with my hsqldb libs. My SQL Tool used
version 1.7.2 whereas Kdo used 1.7.0. A quick update of the property file
of
Aqua Data Studio fixed the problem. Thanks for the hint.
--Bruno
Marc Prud'hommeaux wrote:
Bruno-
Without being at all familiar with "Aqua Data Studio", I'll make a
completely shot in the dark guess about what might be happening: you are
using version x of Hypersonic to access the database, and then "Aqua
Data Studio" is using version x+1. When the database is opened with HSQL
version x+1, some internal version identifier in the database file is
incremented, which disallows the previous version of HSQL (which is
being used by Kodo) from opening the file.
Again, this is a blind guess, but if it is the case, then the solution
would be to ensure that you are using the same version of HSQL in both
Kodo and "Aqua Data Studio".
Otherwise, can you post the stack trace of the exception? That might
give some more insight as to why this might be happening.
As an aside, note that Kodo doesn't store or verify any internal
"version" or anything like that, so I very much doubt that it is a
problem with Kodo itself.
In article <c1fihi$igu$[email protected]>, Bruno Schaeffer wrote:
Hi,
I am using Kodo JDO 3.0.2 together with HSQLDB (non-cached, same
process).
It
runs fine. However, after having used a SQL tool such as Aqua Data Studio
to
inspect the database my Java code complains with the message
"kodo.util.FatalDataStoreException: Wrong database file version". I have
to
rebuild the database and extend my classes again to get rid of thiserror.
Is there some information in the database script that does not survivethe
inspection with the SQL tool? How can I work around this?
Thanks for your help
--Bruno
Marc Prud'hommeaux [email protected]
SolarMetric Inc. http://www.solarmetric.com

Database file size

I am using Berkeley DB 5.1.19 with replication manager.
I am seeing big differences between the size of the db files between the master and the client, is that expected and if so what is the reason. This has impact on the size of the backup too.
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16K replica_data/__db.001
29M replica_data/__db.002
11M replica_data/__db.003
2.9M replica_data/__db.004
25M replica_data/__db.005
12K replica_data/__db.006
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1.1M replica_data/__db.rep.diag00
1.1M replica_data/__db.rep.diag01
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4.0K replica_data/__db.rep.gen
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8.0K replica_data/__db.rep.system
11M replica_data/log.0000000158
7.2M replica_data/log.0000000159
8.0K replica_data/persistency_name_mapping.tbl
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8.0K replica_data/QM_KPI_NumUnderQuotaTable3_20111117T015214.138377_backup.db
8.0K replica_data/QM_KPI_NumUnmanagedTable4_20111117T015214.200234_backup.db
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16K replica_data/__db.001
146M replica_data/__db.002
133M replica_data/__db.003
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1.1M replica_data/__db.rep.diag01
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4.0K replica_data/__db.rep.gen
8.0K replica_data/__db.reppg.db
8.0K replica_data/__db.rep.system
7.2M replica_data/log.0000000159
8.0K replica_data/persistency_name_mapping.tbl
8.0K replica_data/QM_KPI_NumManagedTable1_20111117T015214.012632_backup.db
8.0K replica_data/QM_KPI_NumOverQuotaTable2_20111117T015214.074648_backup.db
8.0K replica_data/QM_KPI_NumUnderQuotaTable3_20111117T015214.138377_backup.db
8.0K replica_data/QM_KPI_NumUnmanagedTable4_20111117T015214.200234_backup.db
8.0K replica_data/QmLastIpAddressTable5_20111117T015214.258221_backup.db
12K replica_data/QmPolicyConfiguration6_20111117T015214.316379_backup.db
13M replica_data/QmSubIdNameTable7_20111117T015214.375543_backup.db
41M replica_data/QmSubscriberQuota_Daily8_20111117T015214.432662_backup.db
41M replica_data/QmSubscriberQuota_PC_or_Monthly9_20111117T015214.506866_backup.db
41M replica_data/QmSubscriberQuota_Roaming10_20111117T015214.570525_backup.db
15M replica_data/QmSubscriberQuotaState12_20111117T015214.717594_backup.db
41M replica_data/QmSubscriberQuota_Weekly11_20111117T015214.634982_backup.db
For example:
The following 2 files on the master are small
29M replica_data/__db.002
11M replica_data/__db.003
Where on the client, the same following:
146M replica_data/__db.002
133M replica_data/__db.003
Thx in advance.

The __db.00* files are not replicated database files. They are internal Berkeley DB files that back our shared memory regions and they are specific to each separate site's database. It is expected that they can be different sizes reflecting the different usage patterns and potentially different configuration options on the master and the client database. To read more about these files, please refer to the Programmer's Reference section titled "Shared memory regions".
I am assuming that your replicated databases are the QM* and Qm* files. These look like they are the same size on the master and client, as we would expect.
Paula Bingham
Oracle

Delete a physical bdb database file

Lets say, I have a bdb database file x. Now, how to delete this file ? Ofcourse you can’t just delete it via command line else there will in inconsistency in bdb logs.
I saw remove API and used it the following way but the file is not deleted yet: http://www.oracle.com/technology/documentation/berkeley-db/xml/java/com/sleepycat/db/Database.html#remove(java.lang.String,%20java.lang.String,%20com.sleepycat.db.DatabaseConfig)
// Get the database handle to the database name “dbToDelete”
Database dbHandle = GetDataBaseHandle(“DbToDelete”)
// Delete this database
dbHandle.rmove(“DbToDelete, DbToDelete, null);
It doesn’t work – any ideas why? Is this the wrong API? Or this API doesn’t remove the database from your system but updates its log to “delete” it?
Thanks
Neha

Well, maybe I was using the API in incorrect manner. Now, I’m using it like:
// Delete this database
dbHandle.rmove(Absolute_Path_To_DbFile_To_Delete , null , null );
This does removes the file from the system. But, I’m just concerned that is that the right way? Shouldn’t somehow the bdb env path be specified in this API?
Neha

How to get AW7 to update an Access database...

I have created a simple Access database file to be used for student records, and need to figure out how to set up AW7 to write data to and from the file. I have scoured the internet, blogs, forums and such, but haven't found anything helpful or straightforward, and most info is for old versions...so does anyone know of a resource, link, or has experience with this? Some sample code for my calc icons to use as a guide? If anyone has experience with this ODBC MIcrosoft Access communication I would greatly appreciate some guidance. Thanks to everyone in advance, I really appreciate it!!

Hey Steve-
I would like your opinion/thoughts on the use of AW- I know that AW has not
been updated for awhile, and won't ever again, so it wouldn't be a good idea
to start now, and I would normally agree. But I still believe AW by itself,
as a standalone program to develop courseware, is still a great tool.
(Wouldn't bother learning it from scratch, but I've used it before.) It
seems to me that AW is not practical in this day and age, because the AW Web
Player is outdated, and AW web publishing was created around IE3 probably,
and LMS's are updated every day...my point is that AW seems to be outdated
when it comes to delivery over the web.
To the point- I may still be tasked with developing some courseware solely
for a stand-alone, independent classroom, completely isolated from the web,
don't even care if IE or Mozilla is installed on any computer. (So no web
packaging, just as .exe or .a7r) Even have full control over whatever
version of Windows is used. So would you still consider AW? I still am,
obviously, I have worked with Captivate and it just seems so simple and
basic compared to the capability AW still has.
To the point again- so taking the web environment out of the equation, *have
you encountered any issues using AW in 2011 that are show-stoppers?* Maybe a
strictly OS issue with Windows 7?
I would be very interested in any brief comments or thoughts you have on
what I have said, you have been a huge help to me already and I really
appreciate your time. Thanks!!
Terry

Flash and database files

Solaris 8 10/02
Archive a netra 20 running Solaris 8 10/02 - The archive create work great. However,
when I tried to install it on another system (boot - install tape) with the same hardware configuration. The sparse Sysbase database files are expanded and no longer file on the partition that was created.
Any ideas?
thanks

Thanks again Barney...
I make a new version of this app every 3 months and I have just created one this week (after updates) and it works fine once burnt onto a CD.
This is what makes me think that the OS is now looking at the older .dat files differently after the updates. Could it be a security issue that they may have been trying to resolve??
It is also PC compatible and all the old CD-ROMs still work fine on PC's.
Thanks again for your help.

Programmically update a SQLCE database file

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