Compression and Index

Hi BW Experts,
I deleted Indexes before loading the data.
Then I compressed the request without Creating the Indexes.
It is taking so much time to compress.
Is this the right procedure? Will it take too long to compress after deleting the index?
Thanks in advance.
Regards,
Anjali

hi anjali
Deletion of indexes , creation of index and then compression is the general procedure
if u r doing a data load in Cube then only its worth deleting and creating index,
As far as I know, for compression there is no significance of index operation as a separate E table will be generated as a result of compression whereas index works with F table only
if u r doing cube load followed by compression then standard steps are as below:
1.Delete cube contents (depends on yr req)
2.Delete index
3. load cube data
4.Compression
5.DB Statistics (u could skip this step if no performance issue)
6.Create Index
Very best method is not include the compression method in the Process chain. Because once the compression is done there is no possiblity to delete the data by requestwise. This may require if there is any error in data extraction.
Drop the index during data extraction because this may cause the performance problem during data loading.
Edited by: Amar on Oct 14, 2008 11:10 AM

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Compression for oracle database and index compression during import of data

Hi All,
I have a query , in order to import into oracle database and also have compression and index compression , do we have some kind of load args for r3load and also do we have to change the tpl file ?

Hello guy,
I did this kind of compression within migration project before.
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Coalesce or compress this index? what is the best solution in this case?

BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64biI have executed the following query on a specific index that I suspected to be smashed and got the following result
select
    keys_per_leaf, count(*) blocks
from (
      select   sys_op_lbid (154813, 'L', jus.rowid) block_id,
             count (*)                            keys_per_leaf
      from xxx_table jus
       where jus.id is not null
              or jus.dat is not null
      group by sys_op_lbid (154813, 'L', jus.rowid)
group by keys_per_leaf
order by keys_per_leaf;
keys_per_leaf     blocks
1     80
2     1108
3     2816
4     3444
5     3512
6     2891
7     2579
8     2154
9     1943
10     1287
11     1222
12     1011
13     822
14     711
15     544
16     508
17     414
18     455
19     425
20     417
21     338
22     337
23     327
24     288
25     267
26     295
27     281
28     266
29     249
30     255
31     237
32     259
33     257
34     232
35     211
36     209
37     204
38     216
39     189
40     194
41     187
42     200
43     183
44     167
45     186
46     179
47     179
48     179
49     171
50     164
51     174
52     157
53     181
54     192
55     178
56     162
57     155
58     160
59     153
60     151
61     133
62     177
63     156
64     167
65     162
66     171
67     154
68     162
69     163
70     153
71     189
72     166
73     164
74     142
75     177
76     148
77     161
78     164
79     133
80     158
81     176
82     189
83     347
84     369
85     239
86     239
87     224
88     227
89     214
90     190
91     230
92     229
93     377
94     276
95     196
96     218
97     217
98     227
99     230
100     251
101     266
102     298
103     276
104     288
105     638
106     1134
107     1152
229     1
230     1      This is a 5 columns unique key index on (id number, dat date, id2 number, dat2 date type number).
Furthermore, a space analysis of this index using dbms_space.space_usage gives the following picture
Number of blocks with at least 0 to 25% free space            = 0                   -------> total bytes = 0
Number of blocks with at least 25-50% free space              = 75                 -------> total bytes = ,5859375
Number of Blocks with with at least 50 to 75% free space = 0                   -------> Total Bytes = 0
number of blocks with at least 75 to 100% free space        = 0                   -------> total bytes = 0
Number of full blocks with no free space                              = 99848           -------> total bytes = 780,0625
Total blocks ______________________________
99923
Total size MB______________________________
799,384It seems for me that this index needs to be either coalesced or compressed.
Then, what would be the best option in your opinion?
Thanks in advance
Mohamed Houri
Edited by: Mohamed Houri on 12-janv.-2011 1:18

So let me continue my case
I first compressed the index as follows
alter index my_index rebuild compress 2;which immediately presents two new situations
(a) index space
Number of blocks with at least 0 to 25% free space    = 0                -------> total bytes = 0
Number of blocks with at least 25-50% free space      = 40              -------> total bytes =, 3125
Number of Blocks with at least 50 to 75% free space   = 0                -------> total Bytes = 0
Number of blocks with at least 75 to 100% free space = 0                -------> total bytes = 0
Number of full blocks with no free space                = 32361           -------> total bytes = 252, 8203125
Total blocks ______________________________
32401
Total size Mb______________________________
259,208meaning that the compress command freed up 67487 leaf blocks and reduced the size of the index from to 799,384 MB to 259,208 MB.
It also shows a relative nice pictue of number of keys per leaf block (when compared to the previous situation)
(b) on the number of key per leaf block
KEYS_PER_LEAF     BLOCKS
4     1
6     1
13     1
15     1
25     1
62     1
63     1
88     1
97     1
122     1
123     3
124     6
125     4
126     2
289     4489
290     3887
291     3129
292     2273
293     1528
294     913
295     442
296     152
297     50
298     7
299     1      In a second step, I have coalesced the index as follows
alter index my_index coalesce;which produces the new figure
Number of blocks with at least 0 to 25% free space     = 0          -------> total bytes = 0
Number of blocks with at least 25-50% free space      = 298        -------> total bytes = 2,328125
Number of Blocks with at least 50 to 75% free space   = 0           -------> Total Bytes = 0
Number of blocks with at least 75 to 100% free space = 0            -------> total bytes = 0
Number of full blocks with no free space = 32375                    -------> total bytes = 252, 9296875
Total blocks ______________________________
32673
Total size MB______________________________
261,384meaning the the coalesce command has made
(a)     298-40 = 258 new blocks with 25-50% of free space
(b)     32375-32361 = 14 new additional blocks which have been made full
(c)     The size of the index increased by 2,176MB (261,384-259,208)
While the number of key per leaf block keeps in the same situation
KEYS_PER_LEAF     BLOCKS
4     2
5     3
9     1
10     2
12     1
13     1
19     1
31     1
37     1
61     1
63     1
73     1
85     1
88     1
122     1
123     4
124     4
125     3
126     1
289     4492
290     3887
291     3125
292     2273
293     1525
294     913
295     441
296     152
297     50
298     7
299     1      Could you please through some light on the difference between the compress and the coalesce on the effect they have made on
(a) the number of keys per leaf blocks within my index
(b) the space and size of my index?
Best regards
Mohamed Houri

DB02 view is empty on Table and Index analyses DB2 9.7 after system copy

Dear All,
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Regards
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Hi Deepak,
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Compress nonclustered index on a compressed table

Hi all,
I've compressed a big table, space has been shrunk from 180GB to 20GB using page compression.
I've observed that this table has 50GB of indexes too, this space has remanied the same.
1) is it possible to compress nonclustered index on an already compressed table?
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ALTER INDEX...
https://msdn.microsoft.com/en-us/library/ms188388.aspx
You saved the disk space, that's fine, but now see if there is some performance impact on the queries, do you observe that any improvement in terms of performance?
http://blogs.technet.com/b/swisssql/archive/2011/07/09/sql-server-database-compression-speed-up-your-applications-without-programming-and-complex-maintenance.aspx
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Compression and query performance in data warehouses

Hi,
Using Oracle 11.2.0.3 have a large fact table with bitmap indexes to the asscoiated dimensions.
Understand bitmap indexes are compressed by default so assume cannot further compress them.
Is this correct?
Wish to try compress the large fact table to see if this will reduce the i/o on reads and therfore give performance benefits.
ETL speed fine just want to increase the report performance.
Thoughts - anyone seen significant gains in data warehouse report performance with compression.
Also, current PCTFREE on table 10%.
As only insert into tabel considering making this 1% to imporve report performance.
Thoughts?
Thanks

First of all:
Table Compression and Bitmap Indexes
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OLTP compression and Backupset Compression

We are testing out a new server before we migrate our production systems.
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Hi Patrick,
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http://taliphakanozturken.wordpress.com/2012/04/07/comparing-of-rman-backup-compression-levels/
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What is the difference between Topic Keywords and Index File Keywords?

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RH9.0.2.271
I'm using Webhelp

Hi there
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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....

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Hi Experts,
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Plz help me out on this issue.
with regards,
Pankaj K and Kamlesh N

Pankaj,
When you do the Manage User Fields area to define a UDF, all the possible areas where UDF's can be created in B1 is listed. You would be able to create UDF's only on these.
Suda

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

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I've been reading the Oracle knowledge base that it suggest that there is a fix or release of Oracle 10g to resolve this problem. However, I've been unable to locate any fix or release to address my issue. Does such a fix or release exist? How do I address this issue? I'm from the world of MS SQL and IBM DB2 and we don't have this issue. I am running and NTFS files system. Could this be issue be related to an Windows Fix?
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
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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
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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

Best practice for PK and indexes?

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?
Thanks in advance..
Zia Shareef

Well, thanks for valueable advices... I am using Oracle 8i and let me tell you exact problem...
My billing database has two major tables having almost 21 millions rows each... one has collection data and other one for invoices... many reports are showing the data with the joining of Customer + Collection + Invoices tables.
There are 5 common fields in between invoices(reading) and collection tables
YEAR, MONTH, AREA_CODE, CONS_CODE, BILL_TYPE(adtl)
My one of batch process has following update and it is VERY VERY SLOW:
UPDATE reading r
SET bamount (SELECT sum(camount)
FROM collection cl
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'unable to connect' and index.php

Hi.
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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
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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'
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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.
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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.

'unable to connect' and 'localhost' and index.php and dreamweaverCC

Hi.
I am developing a Web Site and index.php is my point of entry.
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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>
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I was using Netbeans IDE and when I ran index.php it opened in the browser.
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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.

Site window settings.
Site Name: dwwdSite
Local site folder: /Library/WebServer/Documents/dwwdSite
Server window settings.
Server Name: testing Server
Address: Macintosh HD/Library/WebServer/Documents/dwwdSite
Connect using: Local/network
Testing: yes (checked)
Server folder: /Library/WebServer/Documents/dwwdSite
(I also tried this: Server folder: /Library/WebServer/Documents)
Web URL: http://www.localhost/dwwdSite
Server Advanced tab: (within server window settings)
Testing server: PHP MySQL
Advanced Settings window.
Local info: Web URL: http://www.localhost/dwwdSite
Enable cache: yes (checked)

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