Estimate the tablespace size

Hi,
I am expected to insert around 10580000 rows in a table. Based on this number will I be able to calculate the tablespace size.
Thanks
SC

Hello,
Simple math; excluding any overhead
db_block_size/avg_row_len = approx number of rows per block
Total no of rows / approx number rows per block = Approx number of blocks
Approx number of blocks * db_block_size = Approx number of bytes
Approx number of bytes / (1024*1024) = Size in MB
8192 = db_block_size
173 = avg_row_len
select 8192/173 from dual;
select ( (10580000/47)*8192) / ( 1024 *1024) from dual;
Regards

Similar Messages

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I found someone document said, use this sql to estimate undo tablespace:
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How to see the tablespace size

hi
how to get the tablespace size??
thx

Hello,
select SUM(bytes)/1024/1024 MB from dba_data_files
where tablespace_name = 'xxxxxx';
works fine.
I am trying to build a function for that:
select SUM(bytes)/1024/1024 MB
from dba_data_files
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However, I need to make some enhancements:
1. how to make comments in sql files?Refer to the REM statement in the sqlplus reference manual
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Enter value for user: tts1
old 3: where tablespace_name=upper('&user')
new 3: where tablespace_name=upper('tts1')
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2048
how to avoid that so that only the size is
displayed.
for example:
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Enter value for user: tts1
MB
2048
Refer to set verify off in the sqlplus reference manual.
>
3. how to let the function accept a parameter such
as:
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Refer to the define command in the sqlplus reference manual.
>
4. how to include a usage (help) to that function
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Hello,
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RLUO wrote:
Hello,
Do you have any directions or ideas on how to know the tablespace size increments history. or how to know the frequency of tablespace size increment.
when I went into new database, I never managed this database before, i want to know the tabelspace size increments speed for do the reasonable space extend.
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Hi friends,
Can i get the alert, if the tablespace used size reached to 80%.
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>
Can i get the alert, if the tablespace used size reached to 80%.
Because i handles 25 Databases, going to each databases and checking the tablespace size is really painfull.
Is there any third party free tool available to check the tablespace size OR can we do it in database itself...pls help
>
1 Best option is using Grid Control. It may cost.
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3 Another option is to use some generic monitoring framework like Sysmon.
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Hi therabbitwindfall,
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Hi,
In my database, one tablespace used 5% and it's size is 8GB when i try to shrink the tablespace it gives the error that you can not shrink the tablespace.
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1) Export the tables of that tablepsace
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Hi Friends,
Now i have joined as DBA in new company. After ananyzing my database i came to know my databases system tablespace had lot of user objects that around 9GB. I moved all the tables to another one tablespace now i want to reclaim that 9GB of space from my system tablespace. Bacause due to space constraint my company is not allowing me to keep that 9GB of space wastly. can you please any one let me know any effective procedure for reclaim that 9GB from my system tablespace?
Data base Relaease : 9.2.0.4.0
OS release: Suse linux 2.4.21-198-smp
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Hi Karthik
Looking at the situation which you have mentioned, the only solution which looks feasible to me is :
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Reducing the tablespace size

Hi,
My database size has been grown upto 20GB. So we thought of dropping the users after taking the backup. The problem is even after dropping the user, the size has not been decreased. But when i see the datafile, there it is showing that the percentage of memory occupied is reduced from 99% to 10%.
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Regards,
Alok Dubey

This is not the correct forum to deal with your question. This forum deal with the languages SQL and PL/SQL. You have a general database (use & administration) question.
Please ask this question in the [url http://forums.oracle.com/forums/forum.jspa?forumID=61]Database - General forum.
Simple answer to your question. Dropping a user/schema/table/index frees up space in the tablespace (depending on the size of that being dropped).
It does not decrease the size of the tablespace. (and a tablespace occupies disk space and not memory).
Reducing the size of a tablespace is not a trivial task as it cannot be simply shrunk as there can be data blocks in use at the high-end of the tablespace. Thus the answer to your question is also not trivial and more than one approach can be considered.. which is why you would be best served asking this in the proper forum.

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Hi guys,
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Hi
Perhaps this part of statament DESCRIBE TABLE from SAP help can be usefull for you:
DESCRIBE TABLE
Syntax
DESCRIBE TABLE itab [KIND knd] [LINES lin] [OCCURS n].
Extras:
1. ... KIND knd
2. ... LINES lin
3. ... OCCURS n
Effect
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Max

HOW to find out the tablespace space utilized by a patch after applying the

someone has already applied the patch in test env before recording the tablespace size , so I cannot find out the figure in test env.
So is there any general practice or general guidelines on it?
hOW to find out the tablespace space utilized by a patch after applying the patch?
Thanks & Regards,
Sree.
Edited by: 846579 on Mar 22, 2011 10:50 PM

I think there is no direct way to determine what tablespace is utilized by a patch from the README file. You could check the content of the patch file and see what modules are affected (assuming there are changes and the database level), then query DBA_USERS (DEFAULT_TABLESPACE column) for those schemas which are updated by a patch. Or, you could check the size of the tablespaces before and after applying the patch and you will determine what tablespaces have been utilized (provided that the application services are down, and none of the application users is connected to the application).
Thanks,
Hussein

Updates/Inserts to the Tablespace

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With this script you can monitor the tablespace size and take action:
==========================================
set linesize 150
column tablespace_name format a20 heading 'Tablespace'
column sumb format 999,999,999
column extents format 9999
column bytes format 999,999,999,999
column largest format 999,999,999,999
column Tot_Size format 999,999 Heading 'Total| Size(Mb)'
column Tot_Free format 999,999,999 heading 'Total Free(MB)'
column Pct_Free format 999.99 heading '% Free'
column Chunks_Free format 9999 heading 'No Of Ext.'
column Max_Free format 999,999,999 heading 'Max Free(Kb)'
set echo off
PROMPT FREE SPACE AVAILABLE IN TABLESPACES
select a.tablespace_name,sum(a.tots/1048576) Tot_Size,
sum(a.sumb/1048576) Tot_Free,
sum(a.sumb)*100/sum(a.tots) Pct_Free,
sum(a.largest/1024) Max_Free,sum(a.chunks) Chunks_Free
from
select tablespace_name,0 tots,sum(bytes) sumb,
max(bytes) largest,count(*) chunks
from dba_free_space a
group by tablespace_name
union
select tablespace_name,sum(bytes) tots,0,0,0 from
dba_data_files
group by tablespace_name) a
group by a.tablespace_name
order by pct_free;
=========
regards
Shanoj

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Hi All,
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Code below for the soln.
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How to see tablespace size in data dictionary

How can I see the tablespace size, and used tablespace size in data dictionary view?
it is not in dba_tablespaces, and v$tablespace
Thanks.

I like this little piece of code of mine:
SQL> SELECT
2          TABLESPACE_NAME,
3          RPAD(RPAD('|',100-PCT_FREE,'X'),100) || '|' USED
4 FROM (SELECT TABLESPACE_NAME,
5    100 -
6      ROUND(100 -(SUM(BYTES)/1024/1024/1024)*100/
7                  (SELECT SUM(BYTES)/1024/1024/1024
8                   FROM DBA_DATA_FILES DF
9                   WHERE DF.TABLESPACE_NAME=FS.TABLESPACE_NAME),2
10            ) PCT_FREE,
11    ROUND(SUM(BYTES)/1024/1024/1024,2) GIBFREE
12 FROM DBA_FREE_SPACE FS
13 GROUP BY TABLESPACE_NAME) TABLESPACE_SPACE
14* ORDER BY TABLESPACE_NAME;
TABLESPACE_NAME                USED
ARCHDATA                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX      |
DATBIGGX                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                  |
DATGX                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                                      |
DATLOWGX                       |XXXXXXXXXXXXXXXXXXXXXX                                                                             |
IDXBIGGX                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                 |
IDXLGX                         |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                |
IDXGX                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX          |
LOGMNRTS                       |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                           |
SYSTEM                         |XXXXXXXXXXXXXXXX                                                                                   |
TOOLS                          |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                                   |
UNDOGX                         |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX                                         |Yoann.

Estimate the tablespace size

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