OMF Tablespace in 19c database

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Oracle Managed Files (OMF) handles file creation and deletion directly at the operating system level. 

Sample we only need to specify that you want to create a tablespace; you do not need to specify the name and path of the tablespace's data file with the DATAFILE clause. This feature works well with a logical volume manager (LVM).

Below installation parameters are must enable the  OMF.

 

DB_CREATE_FILE_DEST 

Defines the locations of the default file system directory for the datafiles and temporary files.

SQL> show parameter DB_CREATE_FILE_DEST

 

NAME                                 TYPE        VALUE

-------------------------------------------------------------------------------

db_create_file_dest       string      /u01/app/oracle/oradata

 

DB_CREATE_ONLINE_LOG_DEST_n

Defines the locations of the redo log files and control files creations.

 

DB_RECOVERY_FILE_DEST

Default location for the fast recovery area.


SQL> show parameter DB_RECOVERY_FILE_DEST

 NAME                        TYPE                  VALUE

------------------------------------------------------------------------------------

db_recovery_file_dest    string      /u01/app/oracle/fast_recovery_area

Here will see the two scenario's first one is OMF enabled and second scenario is OMF is disabled 

Scenario 1 OMF Enabled:- 

db_create_file_dest & db_recovery_file_dest are set no need to mention the my data file path and size.

Below screenshot showing OMF enabled and db_create_file_dest & db_recovery_file_dest showing OMF enabled.

If value is empty OMF is disabled the database

 


Let's create one tablespace hear

Below screenshot shows created sample tablespace its automatically fetch the datafile location and size of the datafile. 



Scenario 2 OMF Disabled:- 

I just disabled the OMF and tried to create one tablespace  "create tablespace bsnl;" without specifying any location and size and received an error.

The second command is "create tablespace bsnl datafile'/u01/app/oracle/oradata/TESTDB/datafile/bsnl.dbf'; error I'm getting an error about no size specified.

So this is the distinction in OMF.




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