How to tell Good/Bad Index

Hi there,
Please how can one tell an index is good or bad for usage??
Thanks and regards.
Texas!

-- When you put data into your table index makes oracle to do more work.
This is because oracle has to do extra work of writing down index information.
-- When you get data from your table index can (not always) make it easy for oracle to find your data.
This is because oracle can quickly search for the records that you want. But not in all the cases. FULL SCAN can be a friendly choice may times.
So a index being good or bad depends on the question "Why do i have it (the index) here?"
A table with lots of inserts happening an index there could be BAD for performance.
Usability is an important factor. Is my index used and used efficiently? This plays an important role in determining if you need the specific index or not.
These are few things that came to my mind when i saw this thread.
Thanks,
Karthick.

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How to tell a select statement to ignore an index?

Dear All,
I have a big query that uses many indexes, but when i create a new index on the table accessed by the query, the query will try to use that additional index and so it performs badly. Can you tell me how to tell this query to ignore this index, because I need the index in other queries and I can't drop it.
Regards
Wassim

As Tubby already said, you need to create the index with statistics or at least analyze it just after the creation.
Else the CBO will think that the index is much smaller than all the other indices.
And therefore it will prefere the new index.
exec dbms_stats.gather_index_stats('mySchemaName','myIndexName',null, 100); You could also add "COMPUTE STATISTICS" to the create index command.
Sometimes it is useful to analyze the indexed column, but only if you have an uneven data distibution.
Edited by: Sven W. on Nov 6, 2008 10:02 AM

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Script to find duplicate index and how can we tell if an index is REALLY a duplicate?

Does any one have script to find duplicate index? and how can we tell if an index is REALLY a duplicate?
Rahul

One more written by Itzik Ben-Gan
The first query finds exact matches. The indexes must have
the same key columns in the same order, and the same included columns but in any order.
These indexes are sure targets for elimination. The only caution would be to check for index hints.
-- exact duplicates
with indexcols as
select object_id as id, index_id as indid, name,
(select case keyno when 0 then NULL else colid end as [data()]
from sys.sysindexkeys as k
where k.id = i.object_id
and k.indid = i.index_id
order by keyno, colid
for xml path('')) as cols,
(select case keyno when 0 then colid else NULL end as [data()]
from sys.sysindexkeys as k
where k.id = i.object_id
and k.indid = i.index_id
order by colid
for xml path('')) as inc
from sys.indexes as i
select
object_schema_name(c1.id) + '.' + object_name(c1.id) as 'table',
c1.name as 'index',
c2.name as 'exactduplicate'
from indexcols as c1
join indexcols as c2
on c1.id = c2.id
and c1.indid < c2.indid
and c1.cols = c2.cols
and c1.inc = c2.inc;
The second variation of this query finds partial, or duplicate, indexes
that share leading key columns, e.g. Ix1(col1, col2, col3) and Ix2(col1, col2)
would be considered duplicate indexes. This query only examines key columns and does not consider included columns.
These types of indexes are probable dead indexes walking.
-- Overlapping indxes
with indexcols as
select object_id as id, index_id as indid, name,
(select case keyno when 0 then NULL else colid end as [data()]
from sys.sysindexkeys as k
where k.id = i.object_id
and k.indid = i.index_id
order by keyno, colid
for xml path('')) as cols
from sys.indexes as i
select
object_schema_name(c1.id) + '.' + object_name(c1.id) as 'table',
c1.name as 'index',
c2.name as 'partialduplicate'
from indexcols as c1
join indexcols as c2
on c1.id = c2.id
and c1.indid < c2.indid
and (c1.cols like c2.cols + '%'
or c2.cols like c1.cols + '%') ;
Be careful when dropping a partial duplicate index if the two indexes differ greatly in width.
For example, if Ix1 is a very wide index with 12 columns, and Ix2 is a narrow two-column index
that shares the first two columns, you may want to leave Ix2 as a faster, tighter, narrower index.
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
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How to find out unused Indexes (regardless of restarts of server or database)?

Hello colleagues,
do you know how to get list of unused indexes regardless of restarts of MS-SQL-Server or Database?
Because (if I understand correctly to information in
BOL ) all content of dynamic management view sys.dm_db_index_usage_stats is deleted during restart of MS-SQL-Server or Detach Database.
Due to when I use my next script (to generate report with list of unused indexes) immediately (or after short time) after restart of MS-SQL-Server it contains misleading/confusing information.
USE [AdventureWorks]
GO
DECLARE @CurrDate as varchar(10), @CurrTime as varchar(5), @DatePartsSeparator as char(1), @EmptyDate as smalldatetime;
SET @DatePartsSeparator = '/';
SET @CurrDate = RIGHT ('0' + CONVERT(varchar,DATEPART (day,GETDATE())), 2);
SET @CurrDate = @CurrDate + @DatePartsSeparator;
SET @CurrDate = @CurrDate + RIGHT ('0' + CONVERT(varchar,DATEPART (month,GETDATE())), 2);
SET @CurrDate = @CurrDate + @DatePartsSeparator;
SET @CurrDate = @CurrDate + CONVERT(varchar,DATEPART (year,GETDATE()));
SET @CurrTime = RIGHT ('0' + CONVERT(varchar,DATEPART (hour,GETDATE())), 2);
SET @CurrTime = @CurrTime + ':';
SET @CurrTime = @CurrTime + RIGHT ('0' + CONVERT(varchar,DATEPART (minute,GETDATE())), 2);
SET @EmptyDate = CONVERT(smalldatetime, '01' + @DatePartsSeparator + '01' + @DatePartsSeparator + '2000');
SELECT SERVERPROPERTY('servername') AS [Server]
, DB_NAME(s.database_id) AS [Database]
, o.type_desc [ObjectType]
, o.name AS [Object]
, i.name AS [Index]
, (user_seeks + user_scans + user_lookups) AS Reads
, user_updates AS Writes
, ((SELECT SUM(p.rows) FROM sys.partitions p WHERE p.index_id = s.index_id AND s.object_id = p.object_id) / 100) AS [Rows(1000)]
, CASE
WHEN s.user_updates < 1 THEN 100
ELSE CAST(1.00 * (s.user_seeks + s.user_scans + s.user_lookups) / s.user_updates AS decimal (12,5))
END AS Reads_per_Write
, (SELECT TOP 1 luu.[Last_User_Usage] FROM (
SELECT COALESCE(s.last_user_lookup, @EmptyDate) AS [Last_User_Usage]
UNION
SELECT COALESCE(s.last_user_scan, @EmptyDate) AS [Last_User_Usage]
UNION
SELECT COALESCE(s.last_user_seek, @EmptyDate) AS [Last_User_Usage]
) AS luu ORDER BY luu.[Last_User_Usage] DESC) AS [Last_User_Usage]
, COALESCE(s.last_user_update, @EmptyDate) AS [Last_User_Update]
, CASE WHEN i.is_disabled = 0 THEN 'N' ELSE 'Y' END AS [Disabled]
, i.index_id
, o.create_date AS [Index_Created]
, o.modify_date AS [Index_Modified]
, u.name AS [Index_Owner]
, @CurrDate AS [This_Report_Created]
, @CurrTime AS [This_Report_Created_Time]
, CONVERT(CHAR(40), SUSER_SNAME()) AS [This_Report_Created_by_User]
, 'DROP INDEX ' + QUOTENAME(i.name) + ' ON ' + QUOTENAME(DB_NAME(s.database_id)) + '.' + QUOTENAME(c.name) + '.' + QUOTENAME(OBJECT_NAME(s.object_id)) as 'drop statement'
FROM sys.dm_db_index_usage_stats s
INNER JOIN sys.indexes i ON i.index_id = s.index_id AND s.object_id = i.object_id
INNER JOIN sys.objects o ON s.object_id = o.object_id
INNER JOIN sys.schemas c ON o.schema_id = c.schema_id
LEFT OUTER JOIN sys.database_principals u ON OBJECTPROPERTY ( o.object_id , 'OwnerId' ) = u.principal_id
WHERE OBJECTPROPERTY(s.object_id,'IsUserTable') = 1
AND s.database_id = DB_ID()
AND i.type_desc = 'nonclustered'
AND i.is_primary_key = 0
AND i.is_unique_constraint = 0
AND o.type IN ('U','V')
AND o.is_ms_shipped = 0
AND (SELECT SUM(p.rows) FROM sys.partitions p WHERE p.index_id = s.index_id AND s.object_id = p.object_id) > 10000
ORDER BY Reads;
GO
__________________________________________________________ If isn't above described anything, the following applies: Technical details: * OS: Windows Server v2008-R2, English, Enterprise Edition, x64, SP1 ** My User-Account is member of 'Administrators'
local security group. * MS-SQL-Server: v2008-R2, English, Enterprise Edition, x64, SP1 ** My User-Account is member of 'SysAdmin' db-role.

Hi,
You are right. The sys.dm_db_index_usage_stats DMV tells how often and to what extent indexes are used.
Please check the unused section in the below article to find the unused indexes:
Uncover Hidden Data to Optimize Application Performance
http://msdn.microsoft.com/en-us/magazine/cc135978.aspx#S5
In addition, you can also use Database Engine Tuning Advisor to verify if you have too many indexes. DTA can easily find the bad indexes and provide the recommendation for action.
Reference:
http://blogs.technet.com/b/sql_server_isv/archive/2011/04/08/fundamentals-running-database-engine-tuning-advisor-and-selecting-indexes.aspx
Hope it helps.
Tracy Cai
TechNet Community Support

How can we differentiate normal indexes with spatial indexes

how to knwo schema spatial indexes
any queriy pls provide me
thanks

rp0428 wrote:
Thanks for the link. My parents always said I was 'Spatial'. Now I know that is a good thing.(Spatial? Or just Spaced Out?)
There are a few ways to tell, deending on what you are looking at.
1) Spatial Indexes are implementd in regular tables, prefixed by MDRT$ (MultiDimensional R-Tree)
2) They are DOMAIN indexes, and that is reflected by the INDEX_TYPE in ALL_INDEXES

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How to tell embedded jinitator applet is still running when window closed

Hello, we are trying to accomplish the same thing that is mentioned in this post from Metalink. I've searched for a solution and hope someone here can help. Instead of restating the issue I think David Wilson does a good job of explaining what is needed. Can anyone please suggest a possible solution?
From: David Wilton 07-Oct-05 01:08
Subject: How to tell embedded jinitator applet is still running when window closed
How to tell embedded jinitator applet is still running when window closed
Hi,
We run an oracle 10g forms application through 9iAS over an intranet. All users are running windows 2000 professional.
We run separate frame = true but I would like to switch to separate frame = false
With separate frame = true if the user clicks the outer windows "X" close button (forms mdi window) the user is prompted to save changes before the application ends.
BUT
when using separate frame = false
If the user clicks the upper window "X" button (no longer form mdi window but regular browser window) the window and application is abruptly closed.
I'm interested in using a onbeforeunload function to confirm if the user wants to close the window. This would be placed in the basejini.htm file. This could always ask if the user wants to exit or not. If they click OK then the window closes but if they click "Cancel" you are returned to the forms application exactly where you left. something like event.returnvalue="do you really want to exit?";
However if the user exited using the normal exit form method then the applet is already closed before the onbeforeunoad event fires and there is nothing to go back to and I want the window to close automatically. This is accomplished using close.html file in post forms trigger.
So what I want and what I think many may also want is the check if the embedded applet is still running and if so prompt the user to return to the application or continue to close. Of course If the applet is no longer running then just close because there is no reason confirm closing anymore.
Does anyone have a html/JavaScript solution that can be placed in the jinitiator.htm file? or similar?
Thank you
David
[email protected]
From: Andrew Lenton 07-Oct-05 08:58
Subject: Re : How to tell embedded jinitator applet is still running when window closed
I don't know if this is exactly what you are after but you can add the following to the top of your basejini.htm file and it should prompt the user before exiting the IE window.
<BODY %HTMLbodyAttrs%>
%HTMLbeforeForm%
<SCRIPT>

</SCRIPT>
From: Oracle, mohammed pasha 07-Oct-05 09:55
Subject: Re : How to tell embedded jinitator applet is still running when window closed
David,
Well I could not understand your complete requirement.
Refer to Note.201481.1 How to Close the Browser Window When Closing Forms And How to Simulate SeparateFrame By Javascript
Note.115905.1 How to Close Browser Window When Closing Webforms Applet
Kind Regards,
Anwar
From: David Wilton 07-Oct-05 14:37
Subject: Re : How to tell embedded jinitator applet is still running when window closed
Thank you for your reply and yes you did not understand my question fully.
Sorry if this is a long reply
I am able to close the browser window using information in notes 115905.1 and 201481.1, this is not the issue. We implemented this several years ago. It is workable for both separate frame = true or false.
It is most important to not allow the user to end their forms application by closing the windows browser, they must close using normal form exit commands.
What I want is to have separate frame = false, the big drawback to this option is the user can exit the application and bypass all forms code by pressing the windows "X" close button. This is why we need the code as just provided by Andrew Lenton above in this thread.
BUT Andrew's code will always prompt the user before closing the window and I do not want that. I want the user to be prompted only under scenario 2 listed below.
Here's the 2 case scenario for exiting the application.
1. If the user closes properly and uses exit form which fires all normal form triggers including post_form with it's call to close.html file.
All uncommitted changes are saved or rollback and the users session is ended normally both on the database and in the application server.
All browser windows will close, great all is good. And without Andrew's code the window will close but with Andrew's code the user will be prompted to close or not, if they select Cancel the window will remain but the applet has already ended so why prompt? ...This is what I want to avoid.
2. In the forms app. if the user clicks the windows "X" close button with uncommitted changes. The browser just closes the changes are rollback without prompting the user to save. The users sessions are now lost and still running in the database and application server until they are timed out.
If I use Andrew's code then the user will be prompted to continue to close or go back, if they click Cancel to go back then focus returns to the forms application and the user can continue to work. If the user clicks OK then the window closes and unfortunately their sessions are still lost until timed out.
So what I desire is to add to Andrew's code to check if the embedded applet is still running and prompt the user to close or not accordingly.
Something like:
Basejini.htm like
</HEAD>
<SCRIPT LANGUAGE="JavaScript">
function maximizeWindow()
window.moveTo(0,0);
window.resizeTo(screen.availWidth,screen.availHeight);
function confirm(){
If(document.embeddedapplet.closed())
Win.opener = self;
win.close();
Else if
event.returnValue = "Closing Forms Application. OK to continue?";
</SCRIPT>
<BODY %HTMLbodyAttrs%, onload="maximizeWindow()", onbeforeunload="confirm()">
%HTMLbeforeForm%
I hope this explains my requirements.
David
From: Oracle, Evelene Raechel 10-Oct-05 06:45
Subject: Re : How to tell embedded jinitator applet is still running when window closed
Hi,
Note.199928.1 How to Alert User on Closing Client's Browser Window in Webforms
Regards,
Rachel
From: David Wilton 11-Oct-05 17:40
Subject: Re : How to tell embedded jinitator applet is still running when window closed
I'm sorry this is not helpful at all.
Note 199928.1 is only an alert which does not stop the closing of the window and still displays as an alert if the user does close properly using exit form ... so why would you want to display the alert then?
This is exaclty what I do not want and why I want to determine if the applet is still running before displaying any kind of message.
David
From: Oracle, Evelene Raechel 17-Oct-05 12:23
Subject: Re : How to tell embedded jinitator applet is still running when window closed
Closing thread.
Thanks,

Hello,
I had the same issue last year - wanting to provide a warning on closing the browser, but only if the Forms session is still running. The approach I took is described below, see also the thread where I originally posted this at Closing brower window
Hi there,I've had a similar requirement - or rather, the two conflicting requirements: to warn when the browser is being closed, but for the app to be able to close the browser without a warning being fired.
To always provide a warning when someone (the user or the Forms app) tries to go to a different page (e.g. your close.htm), use Javascript like:
function confirmExit(){
if(appletRunning==true) {
msg="Closing this window or navigating to another page will end your SomeGreatApp session.";
window.event.returnValue=msg;
And make a call to confirmExit() in the onBeforeUnload event of your main page.
You'll notice I first check an 'appletRunning' variable before displaying the warning. This Javascript variable is set to true by my app when it starts up, using an embedded Javabean that calls out to Javascript. Once that variable is set to true, then the warning will be displayed if the user tries to shut the browser by clicking on the 'x' button, or to go to a different URL.
When my app is shutting down, it uses the same Javabean to set appletRunning back to false. It then navigates to a close.htm - which will be done without a warning being displayed.
See Re: How can a Javabean call Javascript function of the basejpi.html?? for example code on how to call Javascript from a bean embedded in your Forms app.
Hope these ideas help you out, it's worked for me (so far, anyway!!)
James

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How can I make OSX index a network share for spotlight?
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My thanks to everyone who has contributed to solving this problem here.
It appears that there still is NOT a good, reliable solution. Please correct me if I'm wrong.
I did find this on http://jonathansblog.co.uk/how-to-enable-spotlight-indexing-on-a-network-drive:
===================================
To enable spotlight indexing on a network drive:
# mdutil /Volumes/name -i on
To disable the indexing of a connected network drive:
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To check the status of indexing on a connected network drive:
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===================================
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mdimport -Vp ./shareName
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My thought was to schedule a Terminal file to execute each night with the mdutil code.
Would this work? If so, how would you setup a scheduled run?
Would it have to be done on each Mac that accesses the Share?

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My requirement is I need to display Batch Number in confirmation of production order(co15) which is entered in creation of production order(co01).While debugging the CO15,i got badi as WORKORDER_GOODSMVT.
I am new to BAdi,HOW to use this badi to meet my requirement.
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waiitng for your favourable replies
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Maruthi.

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Maruthi.K

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Maybe point me to the right files? or just flat out tell me what to do would be nice :P
thanks

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HTH,
Harry

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How to find the BADI'S in Web Dynpro ABAP

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Moderator message: wrong forum, please have a look in the "Web Dynpro ABAP" forum.
Edited by: Thomas Zloch on Jun 18, 2011 4:30 PM

Hi Nagaraju,
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Bad index in constant pool #1 Code segment has wrong length

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From your code..
Here is a suggestion
try {
for (int i=0; i<b.length; i++) b[ i ]=0; // zero the array
Class c = defineClass(name, b, 0, b.length);
} catch (ClassFormatError cfe) {
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