Question

How To find How much memory is allocated to Oracle table spaces

Asked by: matrix0511

Hi, I have an  Oracle DB running on Unix Sun OS. I need to get the unix command to find out how much memory is allocated to a specific Oracle table space. What command would I use? Thanks.

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Asked On
2009-05-21 at 06:03:03ID24427565
Tags

Unix

,

Oracle

,

Sun

Topics

Unix Setup

,

Oracle 10.x

,

Oracle CRM

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Points
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Comments
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Answers

 

by: AndytwPosted on 2009-05-21 at 07:29:47ID: 24441843

The os (unix) doesn't know about Oracle tablespaces.  To find out how much disk space is allocated to an Oracle tablespace you need to query the Oracle database.  In SQL*PLus run the following:

SELECT tablespace_name,
       SUM(bytes) / power(2,20) size_mb
FROM   dba_data_files
WHERE  tablespace_name = '&tbspace_name'
GROUP  BY tablespace_name;
 
Enter value for tbspace_name: TEST
old   4: WHERE  tablespace_name = '&tbspace_name'
new   4: WHERE  tablespace_name = 'TEST'
 
TABLESPACE_NAME                   SIZE_MB
------------------------------ ----------
TEST                                10048
                                              
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by: matrix0511Posted on 2009-05-21 at 12:55:09ID: 24445256

Thanks Andytw. What if I don't know the table space name? Is there a command (s) to display all table spaces??

 

by: AndytwPosted on 2009-05-21 at 13:13:02ID: 24445405

If you remove the where clause in the query in my post above, it will display all tablespaces.  In addition the query below will also include temporary tablespaces:

SELECT tablespace_name,
       SUM(bytes) / power(2,20) size_mb
FROM   dba_data_files
GROUP  BY tablespace_name
UNION
SELECT tablespace_name,
             SUM(bytes) / power(2,20) size_mb
FROM   dba_temp_files
GROUP  BY tablespace_name;

 

by: AndytwPosted on 2009-05-21 at 13:13:46ID: 24445413

output:

SQL> SELECT tablespace_name,
  2         SUM(bytes) / power(2,20) size_mb
  3  FROM   dba_data_files
  4  GROUP  BY tablespace_name
  5  UNION
  6  SELECT tablespace_name,
  7               SUM(bytes) / power(2,20) size_mb
  8  FROM   dba_temp_files
  9  GROUP  BY tablespace_name;
 
TABLESPACE_NAME                   SIZE_MB
------------------------------ ----------
EXAMPLE                               100
SYSAUX                                290
SYSTEM                                490
TEMP                                   20
UNDOTBS1                               75
USERS                                   5
 
6 rows selected.

                                              
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by: matrix0511Posted on 2009-05-21 at 13:17:54ID: 24445446

Andytw, don't I also need to remove "TEST" from the query??

 

by: AndytwPosted on 2009-05-21 at 13:19:53ID: 24445469

yes, remove "TEST" (see my latest query and output)

 

by: matrix0511Posted on 2009-05-22 at 08:16:15ID: 24451940

Hey Andytw, you have helped me find out how much "disk space" is allocated in Oracle DB.

What about "memory"?? How can I find out how much MEMORY is allocated to an Oracle table space?

 

by: AndytwPosted on 2009-05-22 at 09:06:44ID: 24452496

An Oracle tablespace is only a logical grouping of database storages structures (tables, indexes, etc.).  A tablespace consists of a number of datafiles, which can be seen by the OS.  So when you ask about memory that a tablespace consumes I think of secondary storage (disk space).

In your latest post when you talk about "memory" do you mean physical memory (RAM)?  If so, then that doesn't really make sense to me, since tablespaces don't take up physical memory.  Do you want to see how much memory the database instance is consuming?

If so, you can easily do that by looking on your OS.  In windows, the process is oracle.exe.  For sun OS try the following link for more info:
http://www.experts-exchange.com/Operating_Systems/Solaris/Q_20864673.html

If not, then please clarify

 

by: matrix0511Posted on 2009-05-22 at 09:13:52ID: 31583907

Thanks!

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