Question about Global index and Table Partitions

I have created a global index for a partitioned table now in the future the partitions will be dropped in the table. Do I need to do anything to the global index? Does it need to be rebuilt or would it be ok if partitions get dropped in the table?

>
I have created a global index for a partitioned table now in the future the partitions will be dropped in the table. Do I need to do anything to the global index? Does it need to be rebuilt or would it be ok if partitions get dropped in the table?
>
You can use the UPDATE INDEXES clause. That allows users to keep using the table and Oracle will keep the global indexes updated.
Otherwise, as already stated all global indexes will be marked UNUSABLE.
See 'Dropping Partitions' in the VLDB and Partitioning Guide
http://docs.oracle.com/cd/E11882_01/server.112/e25523/part_admin002.htm#i1007479
>
If local indexes are defined for the table, then this statement also drops the matching partition or subpartitions from the local index. All global indexes, or all partitions of partitioned global indexes, are marked UNUSABLE unless either of the following is true:
You specify UPDATE INDEXES (Cannot be specified for index-organized tables. Use UPDATE GLOBAL INDEXES instead.)
The partition being dropped or its subpartitions are empty

Similar Messages

Question about composite index and index skip scan

Hi,
I have a confusion.
I have read Burleson's post on composite index column ordering (http://www.dba-oracle.com/t_composite_index_multi_column_ordering.htm) where he writes that
"......for composite indexes the most restrictive column value(the column with the highest unique values) should be put first to trim down the result set..."
But 10g performance tuning book tells this about INDEX SKIP SCAN ::
"... Index Skip scanning lets a composite index be split logically into smaller subindexes. In skip
scanning, the initial column of the composite index is not specified in the query. In other words, it is skipped.
The number of logical subindexes is determined by the number of distinct values in the initial column.
Skip scanning is advantageous if there are few distinct values in the leading column of the composite index and many distinct values in the non-leading key of the index......."
So if we design Composite indexes acc. to what Burleson said then how can we take advantage of index skip scanning. These two staements oppose each other,don't they ?
Can anybody explain this ?

Dear,
For the moment forget the distinct values and the compressibility. I've tried to reproduce your case here below (using jonathan lewis table script)
create table t1
as
with generator as (
    select    --+ materialize
        rownum id
    from dual
    connect by
        rownum <= 10000
select
    rownum              c1,
    mod(rownum,1000)    c2,
    mod(rownum,5000)    c3,
    mod(rownum,10000)   c4,
    lpad(rownum,10,'0') c5,
    rpad('x',5)         c6
from
    generator    v1,
    generator    v2
where
    rownum <= 1000
alter table t1 add constraint t1_pk primary key (c3,c4,c5,C6);
create index idx_1 on t1 (c1,c2);
begin
     dbms_stats.gather_table_stats(
          ownname           => user,
          tabname           =>'T1',
          estimate_percent => 100,
          method_opt       => 'for all columns size 1'
end;
/and here are what I got with your two selects
mho.sql>> SELECT c1,c2
2 FROM t1
3 WHERE c2 = 3;
        C1         C2
         3          3
Elapsed: 00:00:00.00
mho.sql>> start dispcursor
PLAN_TABLE_OUTPUT
SQL_ID 4dbgq3m2utd9f, child number 0
SELECT c1,c2 FROM t1 WHERE c2 = 3
Plan hash value: 3723378319
| Id | Operation            | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
|* 1 | INDEX FAST FULL SCAN| IDX_1 |      1 |      1 |      1 |00:00:00.01 |       7 |
Predicate Information (identified by operation id):
   1 - filter("C2"=3)
17 rows selected.
Elapsed: 00:00:00.34
mho.sql>> SELECT c3,c4,c5,c6
2 FROM t1
3 WHERE c4 = 3
4 AND c5 = '0000000003'
5 AND c6 = 'x    ';
        C3         C4 C5         C6
         3          3 0000000003 x
Elapsed: 00:00:00.00
mho.sql>> @dispcursor
PLAN_TABLE_OUTPUT
SQL_ID fv62c9uqtktw9, child number 0
SELECT c3,c4,c5,c6 FROM t1 WHERE c4 = 3 AND c5 = '0000000003' AND c6 = 'x    '
Plan hash value: 2969533764
| Id | Operation            | Name | Starts | E-Rows | A-Rows |   A-Time   | Buffers |
|* 1 | INDEX FAST FULL SCAN| T1_PK |      1 |      1 |      1 |00:00:00.01 |       9 |
Predicate Information (identified by operation id):
   1 - filter(("C4"=3 AND "C5"='0000000003' AND "C6"='x    '))
17 rows selected.I didn't succeed to reproduce your index skip scan situation.
Best Regards
Mohamed Houri

Question about ER diagrams and table

Are there any good online articles that could give you a step-by-step hint on ways in coming up with the perfect tables design and relationship from a business requirement...

Be very careful about the word "perfect" ...
Perfection may be possible for a few relatively simple requirements (though even then highly respected practicioners disagree, violently sometimes, on certain things - google "surrogate key" for example).
Large systems with complex overlapping and possibly conflicting requirements are always a compromise.
And then the "almost perfect" logical model hits the performance wall ...

Question about the index and homepages

Hello all,
I am new to dreamweaver and I have only had my website for a couple of months now.
On my site, I have a "Home Page" button that visitors can click to return to the home URL.
My home URL is: www.djidblends.com
When users click on the "Home Page" button, they are taken to the URL: www.djidblends.com/index.html
In the past, whenever I wanted to update my regular home page, I just simply updated the index.html file in dreamweaver... and it worked for both of the URLs listed above.
However, I recently attempted to update the home page once again, and it did NOT work for both URLs.
For example, when I visit www.djidblends.com, my page is NOT updated.
When I click on the "Home Page" button, my page IS updated.
I have looked around and some people have had the same problem as me, but I haven't found a legit fix for this problem.
If anyone knows how I can fix this, I would greatly appreciate your help.
Thanks,
Bye.

On my site, I have a "Home Page" button that visitors can click to return to the home URL.
My home URL is: www.djidblends.com
When you go to http://www.djidblends.com, the server tries to open pages that are named index.htm, index.html, index.php amongst others. In this case index.html will be opened despite it not showing as such in the address bar.
When users click on the "Home Page" button, they are taken to the URL: www.djidblends.com/index.html
That is correct because the Home Page button links to index.html. The reason why it shows in the address bar as http://www.djidblends.com/index.html is because the link is within the www.djidblends.com site. If you click the Contact Information button, the address bar will correspond to the contact.html link.
In the past, whenever I wanted to update my regular home page, I just simply updated the index.html file in dreamweaver... and it worked for both of the URLs listed above.
That is correct, you are uploading the page that is linked to the menu.
However, I recently attempted to update the home page once again, and it did NOT work for both URLs.
For example, when I visit www.djidblends.com, my page is NOT updated.
When I click on the "Home Page" button, my page IS updated.
That is because the browser has a cached copy of your site and it will load the cached copy to save time. When you click the Home Button it may, but not always, refresh the page bypassing the cached version. IE may not respond immediately because it tends to hang onto the cached version of the page much longer.
I have looked around and some people have had the same problem as me, but I haven't found a legit fix for this problem.
If anyone knows how I can fix this, I would greatly appreciate your help.
The problem occurs when someone has paid a visit to your site before the updated page has been uploaded. There are ways to overcome this. For more info have a look here http://en.wikipedia.org/wiki/Wikipedia:Bypass_your_cache
Gramps

Index Vs table partition

I have table whose growth is 1 million per month and may increase in future. I currently place an index on column which is frequently uses in where clause. there is another column which contains months so it may possible that I make 12 partitions of that. I want to know what is suitable. is there any connection between index and table partition?
Message was edited by:
user459835

I think the question is more of what type of queries are answered by this table?
is it that most of the times the results returned span across several months?
is there any relation to the column you use in where clause with the data belonging to a particular month (or range there-of)?

Non-Partitioned Global Index on Range-Partitioned Table.

Hi All,
Is it possible to create Non-Partitioned Global Index on Range-Partitioned Table?
We have 4 indexes on CS_BILLING range-partitioned table, in which one is CBS_CLIENT_CODE(*local partitioned index*) and others are unknown types of index to me??
Means other 3 indexes are what type indexes ...either non-partitioned global index OR non-partitioned normal index??
Also if we create index as :(create index i_name on t_name(c_name)) By default it will create Global index. Please correct me......
Please help me in identifying other 3 indexes types by referring below ouputs!!!
select INDEX_NAME,TABLE_NAME,PARTITIONING_TYPE,LOCALITY from dba_part_indexes where TABLE_NAME='CS_BILLING';
INDEX_NAME TABLE_NAME PARTITI LOCALI
CSB_CLIENT_CODE CS_BILLING RANGE LOCAL
select index_name,index_type,table_name,table_type,PARTITIONED from dba_indexes where table_name='CS_BILLING';
INDEX_NAME INDEX_TYPE TABLE_NAME TABLE_TYPE PAR
CSB_CREATE_DATE NORMAL CS_BILLING TABLE NO
CSB_SUBMIT_ORDER NORMAL CS_BILLING TABLE NO
CSB_CLIENT_CODE NORMAL CS_BILLING TABLE YES
CSB_ORDER_NBR NORMAL CS_BILLING TABLE NO
select INDEX_OWNER,INDEX_NAME,TABLE_NAME,COLUMN_NAME from dba_ind_columns where TABLE_NAME='CS_BILLING';
INDEX_OWNER INDEX_NAME TABLE_NAME COLUMN_NAME
RPADMIN CSB_CREATE_DATE CS_BILLING CREATE_DATE
RPADMIN CSB_SUBMIT_ORDER CS_BILLING SUBMIT_TO_INVOICE
RPADMIN CSB_SUBMIT_ORDER CS_BILLING ORDER_NBR
RPADMIN CSB_CLIENT_CODE CS_BILLING CLIENT_CODE
RPADMIN CSB_ORDER_NBR CS_BILLING ORDER_NBR
select dip.index_name, dpi.locality, dip.partition_name, dip.status
from dba_part_indexes dpi, dba_ind_partitions dip
where dpi.table_name ='CS_BILLING'
and dpi.index_name = dip.index_name;
INDEX_NAME LOCALI PARTITION_NAME STATUS
CSB_CLIENT_CODE LOCAL CSB_2006_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2006_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2007_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2008_4Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_1Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_2Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_3Q USABLE
CSB_CLIENT_CODE LOCAL CSB_2009_4Q USABLE
select * from dba_part_indexes
where table_name ='CS_BILLING'
and locality = 'GLOBAL';
no rows selected
-Yasser
Edited by: YasserRACDBA on Mar 5, 2009 11:45 PM

Yaseer,
Is it possible to create Non-Partitioned and Global Index on Range-Partitioned Table?
Yes
We have 4 indexes on CS_BILLING range-partitioned table, in which one is CBS_CLIENT_CODE(*local partitioned index*) and others are unknown types of index to me??
Means other 3 indexes are what type indexes ...either non-partitioned global index OR non-partitioned normal index??
You got local index and 3 non-partitioned "NORMAL" b-tree tyep indexes
Also if we create index as :(create index i_name on t_name(c_name)) By default it will create Global index. Please correct me......
Above staement will create non-partitioned index
Here is an example of creating global partitioned indexes
CREATE INDEX month_ix ON sales(sales_month)
   GLOBAL PARTITION BY RANGE(sales_month)
      (PARTITION pm1_ix VALUES LESS THAN (2)
       PARTITION pm2_ix VALUES LESS THAN (3)
       PARTITION pm3_ix VALUES LESS THAN (4)
        PARTITION pm12_ix VALUES LESS THAN (MAXVALUE));Regards

Some basic questions about foriegn key , and relationships.

Hi
Thank you for reading my post
I read some documents about foreugn key and tables relation ships.
but i still can not understnad some stuff.
1-when we have a foreign key , we have two tables that we want to relate them together
in a way that one of ? table columns forced to be a value from ?? table column.
what is name of those two tables , i saw , child-parent , ..... which confuse me.
can some one please tell me correct name of those two tables ?
2-some times we need some kind of master details relation like :
one-to-many : i this case MANY table will have a column to point a record in ONE table , can this relation be a foreign key relation ?
3-we can achieve many-to-many relation only by using a helper table to host both tables primary keys in a record to relate them together.
can you point me to some resources that help me to find answers to this questions ?
or explain them to me ?
thank you for your time.

These are critical database basics that you need to understand. I would seriously recommend getting some study in, because proper relational database design relies on the basic principle of data and relationships and a process called normalization.
In reality, you only really need one gigantic table to host data. It would include everything you would want to know about something - let's take a sales order for example. You would have to record the customer's name, address, etc. along with every item they ordered, etc. You would have a HUGE table full of data that appeared over and over and over again. This is bad design for two basic reasons: it is difficult to query, and it is very easy to have minor mistakes like capitalization or alternate spellings that prevent things from matching up properly. For example, let's say Bob orders 40 widgets and 40 digits. In our hypothetical table, we could put it in as Bob - 40 widgets and Robert - 40 digits. See how confusing this can get even in a simple example? And let's say you wanted to correct all of Robert's orders to say Bob and you found out there were 40 orders from "Robert" How would you know which ones to change?
The process of normalization helps to reduce the chance for these types of errors in addition to creating a good basis for indexes. You normalize the data by creating sets of parent/child tables with a "key" value to match them. In our hypothetical situation, you could create a table for orders and a table for customers. In the customers table you give all the detail for the customer in one place, and you assign each customer a unique number or ID. In the orders table we add the customer ID (NOT the name) and we ensure that we are getting the customer we want, in addition to saving a lot of space and eliminating redundancy. In our example, the customers table is the "parent" table and the orders table is the "child" table. The child table references the unique entries in the parent table via that id. That reference is referred to as a foreign key. The foreign key in the child table points back to the original and complete record in the parent table and eliminates the redundancy of keeping all that extra data for every order. Foreign keys in child tables always refer to a primary/unique key in the parent field.
That help?

Two Questions Re: Embedding Flash and Tables Shortcut

.
Two Questions Re: Embedding Flash and Tables Shortcut
1) I work on a Mac and use Dreamweaver 8. Often I like to
embed Flash objects into a page and I do this by using
Dreamweaver's INSERT > MEDIA > FLASH. However, the SWF file
doesn't show up on the published web page and I’ve never had
this issue using previous versions, so I’m not sure what to
do? Here's what Dreamweaver generates when I use their INSERT
feature:
<script type="text/javascript">
AC_FL_RunContent( 'codebase','
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0','wid th','550','height','180','src','flash/BANNER.HOME','quality','high','pluginspage','http:// www.macromedia.com/go/getflashplayer','movie','flash/BANNER.HOME'
); //end AC code
</script><noscript><object
classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0"
width="550" height="180">
<param name="movie" value="flash/BANNER.HOME.swf">
<param name="quality" value="high">
<embed src="flash/BANNER.HOME.swf" quality="high"
pluginspage="
http://www.macromedia.com/go/getflashplayer"
type="application/x-shockwave-flash" width="550"
height="180"></embed>
It seems a bit weird that the SWF file is not showing
considering Flash & Dreamweaver are the most compatible apps,
no? I’m assuming if Dreamweaver is generating this code it
should work, no?
2) I’m getting an error when trying to use the Tables
short cut COMMAND+ OPTION+T that reads...
"While executing objectTag, the following JavaScript error(s)
occurred:
At line 26 of file “Macintosh
HD:Applications:Macromedia Dreamweaver 8:
Configuration:Objects:Common:Table.htm”:
TypeError: cmdDOM.parentWindo.createTableStr is not a
function"
What’s strange is it was working fine last week and for
the life of me I don’t know what could of happened to make
this shortcut get corrupted?
I’ve reinstalled the app multiple times and still I get
the same error :-(
Any help is greatly appreciated!
Thanks in advance!
.

> It seems a bit weird that the SWF file is not showing
considering Flash &
> Dreamweaver are the most compatible apps, no? I?m
assuming if
> Dreamweaver is
> generating this code it should work, no?
It works. Most likely you have not uploaded the Scripts
folder referenced
in the head of the page.
> What?s strange is it was working fine last week and for
the life of me I
> don?t
> know what could of happened to make this shortcut get
corrupted?
Troubleshooting JavaScript errors in Dreamweaver
http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_19105#dat
Murray --- ICQ 71997575
Adobe Community Expert
(If you *MUST* email me, don't LAUGH when you do so!)
==================
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- Template Triage!
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Tutorials & Resources
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- Macromedia (MM) Technotes
==================
"Rupda" <[email protected]> wrote in message
news:[email protected]...
> .
>
>
Two Questions Re: Embedding Flash and Tables Shortcut
>
>
>
1) I work on a Mac and use Dreamweaver 8. Often I like to
embed
> Flash
> objects into a page and I do this by using Dreamweaver's
INSERT > MEDIA >
> FLASH. However, the SWF file doesn't show up on the
published web page
> and
> I?ve never had this issue using previous versions, so
I?m not sure what to
> do?
> Here's what Dreamweaver generates when I use their
INSERT feature:
>
>
<script type="text/javascript">
> AC_FL_RunContent(
> 'codebase','
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#
>
version=7,0,19,0','width','550','height','180','src','flash/BANNER.HOME','qualit
> y','high','pluginspage','
http://www.macromedia.com/go/getflashplayer','movie','f
> lash/BANNER.HOME' ); //end AC code
> </script><noscript><object
> classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
> codebase="
http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#ve
> rsion=7,0,19,0" width="550" height="180">
> <param name="movie" value="flash/BANNER.HOME.swf">
> <param name="quality" value="high">
> <embed src="flash/BANNER.HOME.swf" quality="high"
> pluginspage="
http://www.macromedia.com/go/getflashplayer"
> type="application/x-shockwave-flash" width="550"
height="180"></embed>
>
>
> It seems a bit weird that the SWF file is not showing
considering Flash &
> Dreamweaver are the most compatible apps, no? I?m
assuming if
> Dreamweaver is
> generating this code it should work, no?
>
>
>
>
2) I?m getting an error when trying to use the Tables short
cut
> COMMAND+ OPTION+T that reads...
>
>
"While executing objectTag, the following JavaScript error(s)
occurred:
> At line 26 of file ?Macintosh HD:Applications:Macromedia
Dreamweaver 8:
> Configuration:Objects:Common:Table.htm?:
> TypeError: cmdDOM.parentWindo.createTableStr is not a
function"
>
>
> What?s strange is it was working fine last week and for
the life of me I
> don?t
> know what could of happened to make this shortcut get
corrupted?
>
> I?ve reinstalled the app multiple times and still I get
the same error
> :-(
>
>
>
> Any help is greatly appreciated!
>
>
> Thanks in advance!
>
> :-)
>
> .
>

Question About Color's and Gradients

Hi all,
I have a question about color swatches and gradients.
I am curious to know, if I have 2 color swatches that I make into a gradient color, is it posible to change the tint of each indivdual color in that gradient and have that applied to the gradient without having to adjust the gradients opacity.
The reason that I'm asking this is because in creating a project I found that the colors that I chose for to make my gradient from my swatches were to dark, and while I can adjust each one's tint to my liking (if the object they were applied to was going to be a solid color) but that doesn't seem to apply to the overall gradient.
I hope that makes sense, I know that this was something that was able to be accomplished in quark and was wondering if I can do something similar.

If you double click your gradient swatch (after adding it to the swatches)
Then click a colour stop in the gradient, and then change the drop down menu to CMYK (or rgb)
And you can alter the percentages there. It's not much use for spot colours but it's a start.
But making tint swatches would be a good start anyway.
At least then when you double click the gradient (in the swatches) to edit it you can choose from CMYK, RGB, LAB, or Swatches and adjust each colour stop to your liking.

Question about clear page and reset pagination

Hi,
I have a question about clear pages and the reset pagination in an URL. What is the reason why a clear page doesn't also trigger a reset pagination on the pages which are cleared?
I can't really imagine a business case where it makes sense to clear all data of page items on a page and don't reset the pagination of reports on that page which probably use a page item in there where clause...
The drawback of this behavior is that a developer always has to set the reset pagination checkbox when he clears the target page and the even bigger drawback is that if you specify other pages to clear, you can't reset pagination for them, because reset pagination only works for the target page.
Thanks for your input.
Patrick
*** New *** Oracle APEX Essentials *** http://essentials.oracleapex.info/
My Blog, APEX Builder Plugin, ApexLib Framework: http://www.oracleapex.info/

Enhancement request filed, thanks,
Scott

The question about portlet customization and synchronization

I have a question about portlet customization and synchronization.
When I call
NameValuePersonalizationObject data = (NameValuePersonalizationObject) PortletRendererUtil.getEditData(portletRenderRequest);
portletRenderRequest.setPortletTitle(str);
portletRenderRequest.putString(aKey, aValue);
PortletRendererUtil.submitEditData(portletRenderRequest, data);
Should I make any synchronization myself (use "synchronized" blocks or something else) or this procedure is made thread-safe on the level of the Portal API?

HI Dimitry,
I dont think you have to synchronize the block. i guess the code is synchronized internally.
regards,
Harsha

Gathering statistics on interMedia indexes and tables

Has anyone found any differences (like which one is better or worse) between using the ANALYZE sql command, dbms_utility package, or dbms_stats package to compute or estimate statistics for interMedia text indexes and tables for 8.1.6? I've read the documentation on the subject, but it is still unclear as to which method should be used. The interMedia text docs say the ANALYZE command should be used, and the dbms_stats docs say that dbms_stats should be used.
Any help or past experience will be grateful.
Thanks,
jj

According to the Support Document "Using statistics with Oracle Text" (Doc ID 139979.1), no:
Q. Should we gather statistics on the underlying DR$/DR# tables? If yes/no, why?
A. The recommendation is NO. All internal recursive queries have hints to fix the plans that are deemed most optimal. We have seen in the past that statistics on the underlying DR$ tables may cause query plan changes leading to serious query performance problems.
Q. Should we gather statistics on Text domain indexes ( in our example above, BOOKS_INDEX)? Does it have any effect?
A: As documented in the reference manual, gathering statistics on Text domain index will help CBO to estimate selectivity and costs for processing a CONTAINS() predicate. If the Text index does not have statistics collected, default selectivity and cost will be used.
So 'No' on the DR$ tables and indexes, 'yes' on the user table being indexed.

A question about item "type and release" of source system creation

Hello expert,
I have a question about item "type and release" of source system creation.
As we know,when we create a web servie source system,there will display a pop-up which includes three items as "logical system","source system"and "type and release".
About the item "type and release",when we push "F4" button,there will be three default selections as below:
"ORA 115     Oracle Applications 11i
TLF 205     Tealeaf 2.05B
XPD 020     SAP xPD".
Who can tell me when and how should I use the three selections.
And also I attempted to input the item by some optional letters except the default three selections and it seems that I can input it freely.
Thank you and Best Regards,
Maggie

Hello DMK,
Thank you very much for your answer.It is very helpful for me.
Can I ask you further about it?
I got that it is a semantic description item.
You said the default selections are set by our basis people.Would you like to tell me how should we creat a new value except the default ones for item "type and release"?Only by inputing the value in the item directly?But you see we canot see the new value item we created by ourself when we push "F4" button next time ,is that ok?Or do we have to ask basis people to define one new value item just like the default seletions before we use it.
Also if possible would you like to describe detail about "This becomes important when you are troubleshooting certain issues especially when RFC connection problems."
Thank you and Best Regards,
Maggie
Message was edited by: Maggie

A few questions about the ka790gx and dka790gx

i have a few questions about the ka790gx and dka790gx , how much better is the dka790gx compaired to the ka790gx ? . how much difference does the ACC function make to overclocking etc , i plan on getting a phenom II 940BE or 720BE . i already have the ka790gx so would it be worth building another system using the dka790gx mobo , or should i keep what i already have and just change the cpu ?

It's largely irrelevant what other boards had VRM issues other than the KA790GX - the fact is it died at stock settings. Since there is little cost difference between the more robust DKA790GX (or Platinum if you really need 1394) why bother with the proven weakling? There are other examples around of the KA not having a robust power section. There's no way I would use even a 95W TDP CPU in the KA and absolutely not O/C.....!
As for the credentials of Custom PC, I have generally found their reviews accurate and balanced, and echo my own findings where applicable. If a little too infrequent.
The fact that the KA has such a huge VRM heatsink leads me to my other comments on the Forum, particularly regarding the "fudge" aspect:
"""Henry is spot on - the notion that adding a heatsink to the top of the D2PAK or whatever MOSFETS is effective is virtually worthless. The device's die thermal junction is the tab on the device back - which is always against the PCB pad. The majority of heat is therefore dissipated in to the board, and the fact that the epoxy plastic encapsulation gets hot is simply due to the inability of the heat to be conducted away from the device die via the tab. Not sure when Epoxy become an effective conductor of heat.... Good practice is to increase the size of the PCB pad (or "land" in American) such that the enlarged PCB copper area acts as an adequate heatsink. This is still not as effective as clamping a power device tab to an actual piece of ali or copper, but since the devices used are SMD devices, this is not possible. However, the surface area required to provide sufficient PCB copper area to act as a heatsink for several devices isn't available in the current motherboard layouts. Where industrial SBC designs differ in this respect is to place the VRM MOSFETs on the back of the PCB on very enlarged PCB pads - where real estate for components is not an issue.
Gigabyte's UD3 2oz copper mainboards sound like a good idea, on the face of it. However, without knowing how they have connected the device tabs to where and what remains a mystery. I suspect it is more hype than solution, although there will be some positive effect. From an electrical perspective, having lower resistance connecting whatever to whatever (probably just a 0V plane) is no bad thing.
The way the likes of ASUS sort of get round the problem is to increase the sheer number of MOSFET devices and effectively spread the heat dissipation over a larger physical area. This works to a degree, there is the same amount of heat being dissipated, but over several more square inches. The other advantage of this is that each leg of the VRM circuit passes less current and therefore localised heat is reduced. Remember that as well as absolute peak operating temperature causing reduced component life, thermal cycling stresses the mechanical aspects of components (die wire bonds for example) as well as the solder joints on the board. Keeping components at a relatively constant temperature, even if this is high (but within operating temperature limits), is a means of promoting longevity.
For myself, the first thing I do with a seperate VRM heatsink is take it off and use a quiet fan to blow air on to the VRM area of the PCB - this is where the heat is. This has the added benefit of actively cooling the inductors and capacitors too....
Cooling the epoxy component body is a fudge. If the epoxy (and thus any heatsink plonked on top of it) is running at 60C, the component die is way above that.....
It's better than nothing, but only just."""

What happens to Existing index after table partition and created with local index

Hi guys,
desc part id number, name varchar2(100), salary number
In an existing table PART i am adding 1 more column DATASEQ NUMBER. i am asked to partition the table part based on dataseq.now the table is created with this logic
create table part( id number, name varchar2(100), salary number, DATASEQ number) partition by list(dataseq) (partition PART_INITIAL values (1));
Suggestionn required. since the table is partitioned based on DATASEQ i am asked to add local index on dataseq. i have added local index to dataseq create index idx on part(dataseq) LOCAL; Now my question is already there is existing index is for the column ID and salary.
1) IDX for dataseq is created locally so that it will have partition on each partition on the main table. Please tell me what happens to the existing index on the column ID and salary.. will it again created in local?
Please suggest
S

Hi,
first of all, in reality "partition a table" means create a new table a migrate existing data there (although theoretically you can use dbms_redefinition to partition an existing table -- however, it's just doing the same thing behind the scenes). This means that you also get to decide what to do with the indexes -- which indexes will be local, which will be global (you can also re-evaluate some of existing indexes and decide that they're not really needed).
Second of all, the choice of partitioning key looks odd. Partitioning is a data manageability technique more than anything else, so in order to benefit from it you need to find a good partitioning key. A recently added column named "data_seq" doesn't look like a good candidate. Can you provide more details about this column and why it was chosen as a partitioning key?
I suspect that whoever suggested this partitioning scheme is making a huge mistake. A non-partitioned table is much better in all aspects (including manageability and performance) than wrongly partitioned one.
Best regards,
Nikolay

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