RE: Sanity Check Please: Removing Datafiles after Dropping Tablespace?

From: Mark W. Farnham <mwf_at_rsiz.com>
Date: Tue, 25 May 2021 11:51:20 -0400
Message-ID: <4dce01d7517d$cea17a90$6be46fb0$_at_rsiz.com>

That seems just fine. Extra paranoid folks (aka operational DBAs) might run strings on the control file, too.  

mwf  

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Mladen Gogala Sent: Tuesday, May 25, 2021 11:28 AM
To: oracle-l_at_freelists.org
Subject: Re: Sanity Check Please: Removing Datafiles after Dropping Tablespace?  

Hi Chris, that's not a problem. I don't have 12.1 on my machine any more but I will demonstrate with 19c. First, let's create tablespace "CHRIS" and drop it without "including contents and datafiles":

SQL> select file_name from dba_data_files;

                                            FILE_NAME 
_____________________________________________________ 


/opt/oracle/oradata/ORCLCDB/ORCLPDB1/system01.dbf     


/opt/oracle/oradata/ORCLCDB/ORCLPDB1/sysaux01.dbf     

/opt/oracle/oradata/ORCLCDB/ORCLPDB1/undotbs01.dbf    

/opt/oracle/oradata/ORCLCDB/ORCLPDB1/users01.dbf      

Elapsed: 00:00:00.561
SQL> create tablespace chris datafile '/opt/oracle/oradata/ORCLCDB/ORCLPDB1/chris.dbf' size 100M;

Tablespace CHRIS created.

Elapsed: 00:00:00.484
SQL> drop tablespace chris;

Tablespace CHRIS dropped.

Elapsed: 00:00:00.389
SQL> Now, let's check which data files are in use:

bash-4.2$ fuser -a *.dbf
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/chris.dbf:
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/sysaux01.dbf: 2302 2310 2340 2575 2742 2765 2767 2988 3044
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/system01.dbf: 2302 2310 2328 2340 2575 2736 2742 2746 2748 2752 2763 2765 2988
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/temp01.dbf: 2302 2763
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/undotbs01.dbf: 2302 2310 2342 2575
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/users01.dbf: 2302 2310

As you can see, the file /opt/oracle/oradata/ORCLCDB/ORCLPDB1/chris.dbf doesn't have any processes associated with it. So, let's remove it and restart the instance:

bash-4.2$ rm -i chris.dbf
rm: remove regular file ‘chris.dbf’? y -bash-4.2$ sqlplus / as sysdba

SQL*Plus: Release 19.0.0.0.0 - Production on Tue May 25 11:25:25 2021 Version 19.11.0.0.0

Copyright (c) 1982, 2020, Oracle. All rights reserved.

Connected to:
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production Version 19.11.0.0.0

SQL> startup force
ORACLE instance started.

Total System Global Area 4966052456 bytes

Fixed Size            9146984 bytes
Variable Size         2214592512 bytes
Database Buffers     2734686208 bytes
Redo Buffers            7626752 bytes

Database mounted.
Database opened.
SQL> show pdbs

    CON_ID CON_NAME OPEN MODE RESTRICTED

---------- ------------------------------ ---------- ----------
     2 PDB$SEED              READ ONLY  NO
     3 ORCLPDB1              READ WRITE NO

SQL> So, all is well. You can use "fuser -a" and remove the files which do not have any processes associated with them. With ASM you would have to use some additional trickery, but that's another story.

Regards

On 5/25/21 9:21 AM, Chris Taylor wrote:

Env :12.1.0.2 x86-64 Linux NON-RAC,NON-ASM  

As haste makes waste (or leaves waste as the case may be), I dropped a tablespace as part of a scheduled maintenance. However, I neglected the "INCLUDING CONTENTS AND DATAFILES" portion of the drop command.  

So now I have a lot of datafiles left on the OS.

I've confirmed that fuser doesn't show any PIDs touching the datafiles.  

I think I can drop the datafiles straight from the OS now on both the primary and standby, but need a sanity check here if anyone knows something different? I'm being careful here in case I've forgotten something.  

Thanks,
Chris  

-- 
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
https://dbwhisperer.wordpress.com

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Received on Tue May 25 2021 - 17:51:20 CEST