What role does cache size play in external HD ?

Hello,
I want to replace my existing 500 GB external HD with a larger one. I will want to have 2 partitions, one for Sample Libraries (additional to Logic from Logic ) and one for my daily Backup.
I'm wondering what role the cache plays in a HD and what I need to look out for.
Any general suggestions re make would also be appreciated !
Thanks,
Kay.

SeaDream wrote:
Hello,
I want to replace my existing 500 GB external HD with a larger one. I will want to have 2 partitions, one for Sample Libraries (additional to Logic from Logic ) and one for my daily Backup.
NOT a good idea.
Hard drives fail all the time. So if you have your backup and your samples on the same drive and the drive goes down, guess what you lose? EVERYTHING.
Your backup drive should be a wholly separate drive. And your samples should be on a dedicated drive of their own too (multiple drives if necessary).
What you want are three hard drives:
1) a backup drive (can be anything: USB, FW, eSATA)
2) a samples drive (FW, eSATA. Not USB)
3) a backup of your samples drive (same choices as #2 if you want to be able to swap out the drive in case your original goes bad. Otherwise, USB can be used for data backup but not recommended to run with Logic).
If you were able to install additional hard drives in your computer you could (and should) go with internal drives.
When your backup drive gets full, put it on the side and buy another one. A great choice for backup drives is the Voyager -- a peripheral that plugs into either USB, FW, or eSATA and accepts raw (inexpensive drives). When the drive fills up you eject it from the unit and plop in another one.
Finally, you never want to partition a drive that's part of your recording setup. It will kill performance and, as I said above, if the drive goes down you have too much to lose.

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We have some very serious performance problems with our
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but the results are the opposite of what I expect.
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8200 seconds with a 32 Meg cache. Performance gets worse
as the cache size increases, even though the cache hit rate
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160MB 1KB 900B Total cache size
1 Number of caches
1 Maximum number of caches
160MB 8KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
0 Requested pages mapped into the process' address space
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36084 Pages created in the cache
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40048 Current clean page count
0 Current dirty page count
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1 Maximum number of caches
80MB 8KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
0 Requested pages mapped into the process' address space
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36104 Pages created in the cache
6066249 Pages read into the cache
9063432 Pages written from the cache to the backing file
5963647 Clean pages forced from the cache
118611 Dirty pages forced from the cache
0 Dirty pages written by trickle-sync thread
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20024 Current clean page count
0 Current dirty page count
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42M Total number of times hash chains searched for a page (42687277)
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98M Total number of hash chain entries checked for page (98696325)
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1 Number of caches
1 Maximum number of caches
40MB 8KB Pool individual cache size
0 Maximum memory-mapped file size
0 Maximum open file descriptors
0 Maximum sequential buffer writes
0 Sleep after writing maximum sequential buffers
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the test continues.
System and test info follows
We have 10 databases (in 10 files) sharing a database
environment. We are using a hash table since we expect
data accesses to be pretty much random.
We are using the default cache type: a memory mapped file.
Using DB_PRIVATE did not improve performance.
The database environment created with these flags:
DB_CREATE | DB_THREAD | DB_INIT_CDB | DB_INIT_MPOOL
The databases are opened with only the DB_CREATE flag.
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My data set is about 550 Meg of plain ASCII text data.
13 million inserts and 2 million deletes. Key size is
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BDB 4.6.21 on linux.
1 Gig of RAM
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The test system is not doing anything else while I am
testing.

Surprising result: I tried closing the db handles with DB_NOSYNC and performance
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40MB 1KB 900B Total cache size
1 Number of caches
1 Maximum number of caches
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5001 Current clean page count
5011 Current dirty page count
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47M Total number of times hash chains searched for a page (47428268)
13 The longest hash chain searched for a page
118M Total number of hash chain entries checked for page (118169805)
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dirty pages (and fewer clean pages) from the cache. Forcing a
dirty page out is slower than forcing a clean page out, of course.
Is this result reasonable?
I suppose I could try to sync less often than I have been, but more often
than never to see if that makes any difference.
When I close or sync one db handle, I assume it flushes only that portion
of the dbenv's cache, not the entire cache, right? Is there an API I can
call that would sync the entire dbenv cache (besides closing the dbenv)?
Are there any other suggestions?
Thanks,
Eric

In EJB3 entities, what is the equiv. of key-cache-size for PK generation?

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e.g.:
create sequence pk_sequence increment by 5;
This is so weblogic doesn't need to query the sequence on every entity bean creation, it only needs to query the sequence every 5 times.
With CMP2 entity beans and automatic key generation, this was configured simply by having the following in weblogic-cmp-rdbms-jar.xml:
<automatic-key-generation>
<generator-type>Sequence</generator-type>
<generator-name>pk_sequence</generator-name>
<key-cache-size>5</key-cache-size>
</automatic-key-generation>
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However, we have been trying to find the equivalent with the EJB3-style JPA entities:
We've tried
@SequenceGenerator(name = "SW_ENTITY_SEQUENCE", sequenceName = "native(Sequence=pk_sequence, Increment=5, Allocate=5)")
@SequenceGenerator(name = "SW_ENTITY_SEQUENCE", sequenceName = "pk_sequence", allocationSize = 5)
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Yes, thanks, Thierry. I intended to point that out, and then
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Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
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"Thierry | www.TJKDesign.com" <[email protected]>
wrote in message
news:evr45t$6g8$[email protected]..
> Jay wrote:
>> In this example :
>>
>> html>body #wrap {
>> height:100%; /* 100 % height */
>> }
>>
>> What does html>body do? I've never seen this
syntax before. :-S
>
> On top of what Murray said already, I believe here it is
used as a hack.
> To filter browsers that do not support the child
selector (as "body" can
> only be the immediate descendant of "html" anyway).
> I'd say "html>body" is the opposite of "* html"
> Browsers that "see" the former don't see the latter and
vice versa
>
> --
> Thierry
> Articles and Tutorials:
http://www.TJKDesign.com/go/?0
> The perfect FAQ page:
http://www.TJKDesign.com/go/?9
> CSS-P Templates:
http://www.TJKDesign.com/go/?1
> CSS Tab Menu:
http://www.TJKDesign.com/go/?3
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>

How can I pass a file refnum into and out of external c++ code? What type does it convert to in c++?

I am trying to write external c++ code that will read a file already opened by Labview and therefore assigned a refnum. (Unfortunately, I definately can't use the standard Labview vis.) However I am not sure what c++ type to use in order to manage the refnum.
All help and thoughts appreciated. Thanks,
Joanna

You could do ALL your file handling in C or C++ (MFC CFile for
example) and pass Microsoft file handles into and out of LabVIEW
instead of LabVIEW file references into and out of C. This may be an
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You could create a DLL in MSVC that exports a FileOpen function, a
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It would help us if you would explain what kind of data you are trying
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Douglas De Clue
LabVIEW developer
[email protected]
"Rolf" wrote in message news:...
> A LabVIEW file refnum is an internal Magic Cookie to LabVIEW and there is no
> way to directly extract the actual information assigned to that Magic
> Cookie.
> However the CIN Reference Manual describes one function which allows to
> retrieve a lower level "File" handle and at least on Windows 32 bit and
> LabVIEW
> from version 5 up to and including 6.1 this "File" LabVIEW datatype directly
> maps
> to the Win32 API "FILE" Handle.
>
> The function to use is
>
> MgErr FRefNumToFD(LVRefNum refNum, File *fdp);
>
> It is declared in extcode.h or one of its dependant headers and exported
> from "labview.lib"
> all located in the cintools directory and you can link this lib also to a
> normal DLL project.
> However calling this DLL then from any other process than LabVIEW or a
> LabVIEW
> executable will not initialize the DLL anymore correctly.
>
> Your best option if you need to write in C(++) should be to use the LabVIEW
> file manager
> functions described on the External Code Manual (manual/lvexcode.pdf) on
> this File handle.
> If you need to use directly some Win32 API functions with it please note
> that although currently
> the "File" in the LabVIEW file manager functions matches the FILE in Windows
> 32 bit API
> functions this is an undocumented and hence unsupported feature. The next
> LabVIEW version
> may actually use a different datatype for its "File" parameter to the
> LabVIEW file manager calls
> and your use of assuming File == FILE may simply crash.
>
> Also operating on a file refnum in LabVIEW which has been accessed directly
> with Win API
> functions may result in strange behaviour such as the file read/write mark
> not being updated as
> you would maybe expect it.
>
> "Jo" wrote in message
> news:50650000000800000016520000-1023576873000@exchange.ni.com...
> > How can I pass a file refnum into and out of external c++ code? What
> > type does it convert to in c++?
> >
> > I am trying to write external c++ code that will read a file already
> > opened by Labview and therefore assigned a refnum. (Unfortunately, I
> > definately can't use the standard Labview vis.) However I am not sure
> > what c++ type to use in order to manage the refnum.
> > All help and thoughts appreciated. Thanks,
> > Joanna

Will Result Cache improve the database performance in 11g? what is the max size of Result Cache?

Will Result Cache improve the database performance in 11g? what is the max size of Result Cache?

Thanks for convincing me I really need a new laptop...
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105413504
Elapsed: 00:00:52.94
SQL> select /*+ result_cache */ count(*) from emp,emp,emp,emp,emp,emp,emp;
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105413504
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SQL> select /*+ result_cache */ count(*) from emp,emp,emp,emp,emp,emp,emp;
COUNT(*)
105413504
Elapsed: 00:00:00.01
SQL> select count(*) from emp,emp,emp,emp,emp,emp,emp;
COUNT(*)
105413504
Elapsed: 00:00:45.08
SQL> select count(*) from emp,emp,emp,emp,emp,emp,emp;
COUNT(*)
105413504
Elapsed: 00:01:16.29
SQL> select count(*) from emp,emp,emp,emp,emp,emp,emp;
COUNT(*)
105413504
Elapsed: 00:01:18.63
Message was edited by: Hoek
The result cache seems to have lagged a bit for the first hintless query..

What is CK11 and CK24? And what role do they play in A/c Detrn. ?

Hi,
What is CK11 and CK24? And what role do they play in A/c Detrn. ?
Regrds,
Binayak

Hi,
CK11n is to run a cost estimate.
Suppose,
If material price (ROH) is Rs.10,
There are two activities, setup & processing in the machine.
Setup = Rs.5
Processing = Rs.10.
The system will add all these values & then give a estimate as Rs.25. Suppose there are other costs involved , system will include this.
where as CK24, is to mark & release after a costing estimate.
(ie) this is used by FI to update the price in the material master for future use.
These transactions are normally used if costing is done through product cost collector. Eg. In Repetitive manufacturing Scenario.
Hope this helps,
Reward if useful.
Regards,
Senthilkumar SD

What role does cache size play in external HD ?

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