Statistics and indexes

hi gurus,
wat r bw statistics and indexes .... how to use them
thanx in advance

Anna,
Indexes are structures sorted by attribute values that contains a pointer to data stored in a table.
In plain words, when we run an indexing process on a table we basically build a pointer to that table records. That pointer has one main purpose: to enhance read performance (in our case - to enhance query performance).
BW Statistics are used in order to analyze the performance of queries and processes in the warehouse management (for example loading processes and aggregations). In order to use BW Statistics, you will need to enable them for your infoprovider and then be able to browse them from transcation ST03 or using the Technical Content Infoprovider and Queries.
See the Statistics How to: https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5401ab90-0201-0010-b394-99ffdb15235b
Hope it helps,
Gili

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Gathering schema Statistics and Index rebuilding

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Hi all,
Plz help me in Gathering Statistics of Tables and Indexes.
Thanks

for tables
exec dbms_stats.gather_table_stats('SCOTT', 'EMPLOYEES');
for indexes
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check this link for detail
http://nimishgarg.blogspot.com/2010/04/oracle-dbmsstats-gather-statistics-of.html

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Welcome to SDN,
Please search on help.sap.com or SDN before you post your query to avoid duplicate thread.
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Hi,
Some feedback on statistics:
1. When choosing a table -> Statistics -> gather Statistics, the minimum is to have a CASCADE option (so all the indexes will be analyzed too). I think it should be the deafult! This way there is a chance that the developers will have good statistics...
As a bonus, an advanced tab with the rest of the options might be nice, when you have time.
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1. When looking at the index tab of a table, unusable indexes should be visibly different - maybe just color the status column. Well, any color-coding can help to gain more infomation very fast (index types and index status). Well, I guess the same goes for disabled triggers, disabled constraints etc...
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Well, same goes for the triggers tab of a table - when right-clicking a trigger give us the trigger actions(enable/disable, drop...), not export.
my two cents,
Ofir

When Choose a partitioned table from the tables list (tree view on the left), I have many tabs with details (Columns, data, indexes,etc).
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DB02 view is empty on Table and Index analyses DB2 9.7 after system copy

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Vinay

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it's better to export/import with systemcopy.
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Dear All,
What is the best practice for making Primary Key and indexes? Should we keep them in the same tablespace as table or should we create a seperate tableapce for all indexes and Primary Key? Please note I am talking about a table that has 21milion rows at the moment and increasing 10k to 20k rows daily. This table is also heavily involved in daily reports and causing slow performance. Currently the complete table with all associated objects such as indexes and PK is stored in one seperate tablespace. If my way is right then please advise me how can I improve the performance of retrival or DML operation on this table?
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Well, thanks for valueable advices... I am using Oracle 8i and let me tell you exact problem...
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WHERE r.ryear = cl.byear
AND r.rmonth = cl.bmonth
AND r.area_code = cl.area_code
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AND r.adtl = cl.adtl)
WHERE area_code = 1
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Missing Tables and Indexes

Hi all,
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all are the standard table indexes.
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Hi,
Refer to the note and lins on how to fix it
Note 1320008 - DBA Cockpit: Selection in "Missing Tables and Indexes"
http://wiki.sdn.sap.com/wiki/display/TechTSG/(DB)IndexReportedasMissing
http://help.sap.com/saphelp_nwpi711/helpdata/en/33/5b277b8b0745b8b60e67ca04c77ebb/content.htm
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Hello Experts,
What is the concept of tablespaces, statistics , tables and indexes in SAP/Oracle ? Where are they used and what are they meant for ?
Wt is the concept and procedure of performing Reorganization of tablespaces, tables and indexes ? why do we need it for ?
Requested to revertb at earliest as its urgent . points guaranteed .
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Somya

Hello Somya,
Probably difficult to explain entire information in this thread. But you definately get good information in the following link
http://help.sap.com/saphelp_47x200/helpdata/en/0d/d2fafd4a0c11d182b80000e829fbfe/frameset.htm
Please drill down through menus, and you will be able to get good information.
Also you can check the following SAP notes
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912620     FAQ: Oracle indexes
588668     FAQ: Database statistics
592393     FAQ: Oracle
541538     FAQ: Reorganizations
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DB Statistics & BI Indexes

Hi All,
I have been going through a lot of threads related to DB Statistics & BI Indexes and I am confused.
1) How do I come to know that the DB Statistics and BI Indexes for a cube are active or created?
Is it through RSDDSTAT where the status is X means stats are active? Is there another way to find out?
What about BI Indexes?
2) How do I create DB Statistics?
3) Does creatting DB statistics for query help the query performance or creating DB statistics on cube helps the Query performance or is it both?
4) I understand primary indexes are created while creating the cube.However, when we try to create secondary indexes through performance tab in which table the details are stored? Can it be deleted later?
5) Is there another way to create BI Indexes other than performance tab?

P.S: the formatting went nuts... I added *** before each of my replies... COME ON SAP!! Cant you fix this???
Hi.
1) How do I come to know that the DB Statistics and BI Indexes for a cube are active or created?
Is it through RSDDSTAT where the status is X means stats are active? Is there another way to find out?
What about BI Indexes?
In addition to the performance tab where you got the traffic lights, you can check the indexes through tcode SE11. Just input the table name and on the next sceen click the button reading "Indexes...". A popup will show you the indexes that exist for the table you are looking at. Doubleclicking any of the indexes will take you to the details.
You can also define a new, secondary index here. You might have to go to DB02->missing indexes to have it created on the database, even though it says it exists and is active in se11... get your basis guy in on all of this.
2) How do I create DB Statistics?
Through Performance tab or step in process chain, but you should schedule db stats at least once a week in that DB-maintenance-calendar-thingy you can get to with a tcode I cannot remember... DBxx where xx is two numbers...ask your basis guy.
3) Does creatting DB statistics for query help the query performance or creating DB statistics on cube helps the Query performance or is it both?
You cannot create statistics for a query. You can collect statistics about the query use. This is the statistics stuff you can activate from bct; the "statistics-cubes" and all that. They store the info you collect and this is then called BI Statistics. It is of absolutely no use whatsoever with regards to performance. You can learn a lot about your system by analysing this, but starting to collect the BI Statistics wont help your slow running queries.
You can create statistics for cubes. This is the DB Stats and the effect of creating it is that the system will know how the data is distributed in the cube and because of that, it will have a better chance of reading data according to your selections faster. Much faster in some cases! This goes for both queries and loads (a load is just a special kind of query, where results are not put on the screen but in another table). Try to keep your DB Stats as up to date as you can - I always update the stats after each load and compression... It is especially important on transactional cubes, because data is more volatile here than when you only load every second day or so.
4) I understand primary indexes are created while creating the cube.However, when we try to create secondary indexes through performance tab in which table the details are stored? Can it be deleted later?
I dont know the tables this is stored in, but you can delete any index using SE11as mentioned above. Secondary indexes will need to be re-defined in SE11 when your system has been taken down... or if you activate the cube. In that case, only the hardwired primary indexes are created.
5) Is there another way to create BI Indexes other than performance tab?
I think you can only create/define an index in SE11, but you can refresh it from the Performance tab or in a process chain.
Regards,
Jacob
Edited by: Jacob Jansen on Aug 10, 2010 9:56 PM

What is the difference between Topic Keywords and Index File Keywords?

What is the difference between Topic Keywords and Index File Keywords? Any advantages to using one over the other? Do they appear differently in the generated index?
RH9.0.2.271
I'm using Webhelp

Hi there
When you create a RoboHelp project you end up with many different ancillary files that are used to store different bits of information. Many of these files bear the name you assigned to the project at the time you created it. The index file has the project name and it ends with a .HHK file extension. (HHK meaning HTML Help Keywords)
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As I said earlier, the default is to add keywords to the Index file until you configure RoboHelp to add the keywords to the topics themselves. Once you change this, any keyword added will become a META tag in the topic code. If your keyword is BOFFO, the META tag would look like this:
<meta name="MS-HKWD" content="BOFFO" />
When the help is compiled or generated, the Index (.HHK) file is consulted as normal, but any topics containing keywords added in this manner are also added to the Index you end up with. From the appearance perspective, the end user woudn't know the difference or be able to tell. Heck, if all you ever did was interact with the Index pod, you, as an author wouldn't know either. Well, other than the fact that the icons appear differently.
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Different b/w index rebuild and index rebuild online

hi..guys could u plz tel me difference between index rebuild and index rebuild online

There is no difference in both the commands. Both will rebuild the index structure from the scratch.But in the first case with only Rebuild, as long as the index, its temporary segment is not prepared and merged together, index is not available for the other users for use. The Online clause makes the index available for others even while being rebuild.
Rebuilding index online has the same concept of creating them online to some extent,
http://download.oracle.com/docs/cd/B10501_01/server.920/a96521/indexes.htm#3062
HTH
Aman....

Ceartion of User Defined Field in EXCHANGE RATE AND INDEXES

Hi Experts,
I want to create User Defined Field in EXCHANGE RATE AND INDEXES.But while creating the UDF from User Defined Field-Management unable to find the table for it.Write now My Client are using SAP B1 2007 Ptach-08.Is there any way out to create user defined field in EXCHANGE RATE AND INDEXES.
Plz help me out on this issue.
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Pankaj K and Kamlesh N

Pankaj,
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Suda

Table files and Index files 2GB on Windows 2003 Server SP2 32-bit

I'm new to Oracle and I've ran into the problem where my Table files and Index files are > 2GB. I have an Oracle instance running version 10.2.0.3.0. I have a number of tables file and index files that have a current files size of 1.99GB. My Oracle crashes about three times a week because of a "Write Fault/Failure. I've detemined that the RDBM is trying to write a index or table files > 2GB. When this occurs it crashes.
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Surely Oracle can handel databases > 2GB.
Thanks in advance for any help.

After reading your response it appears that my real problem has to do with checking pointing. I've included below a copy of the error message:
Oracle process number: 8
Windows thread id: 3768, image: ORACLE.EXE (CKPT)
*** 2008-07-27 16:50:13.569
*** SERVICE NAME:(SYS$BACKGROUND) 2008-07-27 16:50:13.569
*** SESSION ID:(219.1) 2008-07-27 16:50:13.569
ORA-00206: Message 206 not found; No message file for product=RDBMS, facility=ORA; arguments: [3] [1]
ORA-00202: Message 202 not found; No message file for product=RDBMS, facility=ORA; arguments: [D:\ELLIPSE_DATABASE\CONTROL\CTRL1_ELLPROD1.CTL]
ORA-27072: Message 27072 not found; No message file for product=RDBMS, facility=ORA
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.
error 221 detected in background process
ORA-00221: Message 221 not found; No message file for product=RDBMS, facility=ORA
ORA-00206: Message 206 not found; No message file for product=RDBMS, facility=ORA; arguments: [3] [1]
ORA-00202: Message 202 not found; No message file for product=RDBMS, facility=ORA; arguments: [D:\ELLIPSE_DATABASE\CONTROL\CTRL1_ELLPROD1.CTL]
ORA-27072: Message 27072 not found; No message file for product=RDBMS, facility=ORA
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.
Can you tell me why I'm having issues with checking point and the control file?
Can I rebuild the control file if it s corrupt?
The problem has been going on since April 2008. I'm takening over the system.
Thanks

'unable to connect' and index.php

Hi.
I am developing a Web Site and index.php is my point of entry.
Document Root     Library/WebServer/Documents
so my path is:       Library/WebServer/Documents/dwwdSite
httpd.conf file is modified to add index.php and have it listed first.
<IfModule dir_module>
DirectoryIndex   index.php   index.html
<IfModule>
Troubleshooting:
I was using Netbeans IDE and when I ran index.php it opened in the browser.
When I launched 'any' of my index.php files from Netbeans IDE, they opened correctly in the brower
I am NOW using DreamweaverCC and when I run the index.php Error Message ' Unable to Connect'.
For the last 2 days I have been working on this and I am completely stuck.
This morning I thought of another way to test the 'unable to connect' error.
I decided to copy this same file into Netbeans IDE and I NOW get the same Error Message ' Unable to Connect'
when running index.php from Netbeans.
Somehow, my settings are not correctly configured anymore.
Here are my screenshots from Dreamweaver > manage sites.
I believe that this is a rather simple fix that I am somehow not seeing.
Maybe some can spot some mistake.
I appreciate your help and explanation.

Hi Sudarshan.
You have been very kind and very clear in your explanation.
One of the very best that I have ever communicated with on this forum !
I have checked many, many things.
I wanted to make certain that I killed apache and restarted it.
I do not think it is RUNNING at all.
1.
myNameMacBookPro:~ myName$ pwd
/Users/myName
2.
myNameMacBookPro:~ myName$ ps -ax | grep http
1892 ttys000    0:00.00 grep http
3.
myNameMacBookPro: myName$ hostname
local
4.
myNameMacBookPro:etc myName$ cd apache2
reginaMacBookPro:apache2 myName$ ls
extra            httpd.conf.pre-update    mime.types        other
httpd.conf        magic            original        users
5.
myNameMacBookPro:apache2 myName$ sudo nano httpd.conf
myNameMacBookPro:apache2 myName$ sudo apachectl -k restart
Syntax error on line 1 of /private/etc/apache2/users/myNameBU.conf:
Invalid command '{\\rtf1\\ansi\\ansicpg1252\\cocoartf1187\\cocoasubrtf370', perhaps misspelled or defined by a module not included in the server configuration
httpd not running, trying to start
myNameMacBookPro:apache2 myName$
6.
The above code may be a hint at part of the problem.
I created myNameBU.conf as a backup when I was editing the file.
QUESTION. Why is /private/etc/apache2/users/myNameBU.conf:
being referenced above ?
7.
I scanned my ports from preferences and found these two which I believe are what you stated they should be.
port 80 is html
port 8080 is html-alt
8.
I have modified this line and tried it both ways restarting apachectl each time.
AllowOverride None
AllowOverride All
9.
And here is a part of my httpd.conf.
excerpts.
httpd.conf
# User/Group: The name (or #number) of the user/group to run httpd as.
# It is usually good practice to create a dedicated user and group for
# running httpd, as with most system services.
User _www
Group _www
# DocumentRoot: The directory out of which you will serve your
# documents. By default, all requests are taken from this directory, but
# symbolic links and aliases may be used to point to other locations.
DocumentRoot "/Library/WebServer/Documents"
# Each directory to which Apache has access can be configured with respect
# to which services and features are allowed and/or disabled in that
# directory (and its subdirectories).
# First, we configure the "default" to be a very restrictive set of
# features.
<Directory />
    Options FollowSymLinks
    AllowOverride None
    Order deny,allow
    Deny from all
</Directory>
10.
I took a look at this too.
usr/bin
#path to httpd binary including options if necessary
HTTPD = "usr/sgin/httpd"
# pick up any environmental variables if test - f /usr/sbin/envvars; then ./usr/sbin/envvars
fi
STATUSURL = "http://localhost:80/server-status
11.
Just a reminder.
I started writing .php scripts with Netbeans IDE.
The programs ran: I got output in the brower. Things worked just fine !
I started writing .php scripts with DreamweaverCC.
The programs NEVER ran.
I have always gotten 'Unable to Connect"
Firefox/Safari can't establish a connection to the server at localhost.'
12.
QUESTION.
At one point I was on the phone with a member of the Adobe Technical Support Team.
They connect to my desktop (only) remotely. I am very cautious about this.
Could something have been inadvertently changed when they did this ?
They do need to connect through a PORT - yes ?
This is very frustrating and I am loosing days of work.
I want to get back to Web Development
I love Adobe products but this should not be such a huge obstacle.
When I called Technical support (after much troubleshooting individually and on this forum)
the fellow told me that the ONLY support FTP - not LOCALHOST.
This makes no sense. People develop 'locally' then put it ftp it in the production stage.
Again, I appreciate your assistance.

Statistics and indexes

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