DBA CHANAKYA

TABLESPACE MANAGEMENT

List All Tablespaces in the Database

Queries

 select tablespace_name from dba_tablespaces;

select file_name,tablespace_name from dba_data_files;

Find the Used & free space

Script: 

Reference : http://www.orafaq.com/wiki/Tablespace

SELECT /* + RULE */  df.tablespace_name "Tablespace",
       df.bytes / (1024 * 1024) "Size (MB)",
       SUM(fs.bytes) / (1024 * 1024) "Free (MB)",
       Nvl(Round(SUM(fs.bytes) * 100 / df.bytes),1) "% Free",
       Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"
  FROM dba_free_space fs,
       (SELECT tablespace_name,SUM(bytes) bytes
          FROM dba_data_files
         GROUP BY tablespace_name) df
 WHERE fs.tablespace_name (+)  = df.tablespace_name
 GROUP BY df.tablespace_name,df.bytes
UNION ALL
SELECT /* + RULE */ df.tablespace_name tspace,
       fs.bytes / (1024 * 1024),
       SUM(df.bytes_free) / (1024 * 1024),
       Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1),
       Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes)
  FROM dba_temp_files fs,
       (SELECT tablespace_name,bytes_free,bytes_used
          FROM v$temp_space_header
         GROUP BY tablespace_name,bytes_free,bytes_used) df
 WHERE fs.tablespace_name (+)  = df.tablespace_name
 GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used

 ORDER BY 4 DESC;

HOW TO ADD DATAFILE TO TABLESPACE 

First Check if we have free space in the file system

Second add the datafile

Verify if the datafile is added.

Commands & Queries.

df -h /filesystemname

 alter tablespace users add datafile '<location>' size 10m;

select file_name,tablespace_name,bytes/1024/1024 from dba_data_files where tablespace_name='USERS';

BYTES - SIZE OF THE DATAFILE 

CREATE A NEW TABLESPACE

COMMANDS

create tablespace test datafile '/appl/oradata/test01.dbf' size 10m autoextend on maxsize 3000m;

select file_name,tablespace_name,bytes/1024/1024,autoextensible  from dba_data_files where tablespace_name='TEST';

select tablespace_name, max_size 

from dba_tablespaces where tablespace_name='TEST';

AUTOEXTENSBILE = YES specifies the file can be extended if 10MB of space is full provided we have space in filesystem.

MAXSIZE - maximum size of the datafile