Alejandro Vargas' Blog: June 19, 2007 Archives

RAC and single instance as well ...

OS Watcher is a monitoring application, written by Carl Davis from Oracle Center of Expertise.

And I think is wonderful! install in minutes and work straight away without any problems.

Is the kind of application you may hold on your disk-on-key and install on a client site so that after a couple of hours you will be able to check and see if there is an OS related issue, where the bottleneck is located.

OSW gather statistics using OS commands vmstat, iostat, mpstat, netstat and top. It create one file per hour. This make easy to drill down to a problematic time, and compare it to base line information.

OSW provides also a java interface to display the information in graphic format.

Here you can find a quick start guide I did prepare, you can review the full guide on Metalink OS Watcher Guide

This is an example of the graphics you will be able to display using OSW:

osw-mem-graph:

Moving datafiles from file system to ASM can be done in different ways, one of them using the RMAN copy command.

These are the steps:

1. Check where to build a new file system based tablespace:

[oracle@rac1 ~]$ cd /u01/oradata/racdb
[oracle@rac1 ~]$ df -k .
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/vx/dsk/u01
31457280 17540576 13819976 56% /u01

2. Connect to sqlplus and create a new tablespace

[oracle@rac1 racdb]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.3.0 - Production on Tue Jun 19 06:07:50 2007

Copyright (c) 1982, 2006, Oracle. All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

SQL> create tablespace trtst datafile '/u01/oradata/racdb/trtst01.dbf' size 150M;

Tablespace created.

SQL> select file_name from dba_data_files where tablespace_name ='TRTST';

FILE_NAME
--------------------------------------------------------------------------------
/u01/oradata/racdb/trtst01.dbf

3. take the tablespace offline, you may take offline a single datafile from a multifile tablespace if required.

SQL> ALTER TABLESPACE TRTST OFFLINE;

Tablespace altered.

4. Check where are your datafiles located on ASM

SQL> SELECT FILE_NAME FROM DBA_DATA_FILES;

FILE_NAME
--------------------------------------------------------------------------------
+DATADG/racdb/datafile/users.259.623629857
+DATADG/racdb/datafile/sysaux.257.623629849
+DATADG/racdb/datafile/undotbs1.258.623629855
+DATADG/racdb/datafile/system.256.623629845
+DATADG/racdb/datafile/undotbs2.261.623630209
/u01/oradata/racdb/trtst01.dbf

6 rows selected.

5. Log out from sqlplus, start an RMAN session and execute the copy command

Note that when giving the destination inside ASM you just need to pass the disk group name when using omf (Oracle Managed Files) that is the best practice in ASM.

SQL> EXIT
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options
[oracle@rac1 racdb]$ rman target / nocatalog

Recovery Manager: Release 10.2.0.3.0 - Production on Tue Jun 19 06:12:14 2007

Copyright (c) 1982, 2005, Oracle. All rights reserved.

connected to target database: RACDB (DBID=621246832)
using target database control file instead of recovery catalog

RMAN> copy datafile '/u01/oradata/racdb/trtst01.dbf' to '+DATADG';

Starting backup at 19-JUN-07
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile fno=00006 name=/u01/oradata/racdb/trtst01.dbf
output filename=+DATADG/racdb/datafile/trtst.263.625644857 tag=TAG20070619T061416 recid=1 stamp=625644858
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:04
Finished backup at 19-JUN-07

RMAN> exit

Recovery Manager complete.

6. Start an sqlplus session, rename the old file to the new ASM file

[oracle@rac1 racdb]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.3.0 - Production on Tue Jun 19 06:15:11 2007

Copyright (c) 1982, 2006, Oracle. All Rights Reserved.

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Real Application Clusters, OLAP and Data Mining options

SQL> alter database rename file '/u01/oradata/racdb/trtst01.dbf' to '+DATADG/racdb/datafile/trtst.263.625644857';

Database altered.

SQL> alter tablespace trtst online;

Tablespace altered.

7. remove the old file

rm /u01/oradata/racdb/trtst01.dbf

8. Create a test object

SQL> create table testtb tablespace trtst as select * from dba_source;

Table created.

End of the Example

Alejandro Vargas' Blog

June 19, 2007 Archives

June 19, 2007

RAC Proactive Monitoring Using OS Watcher

Moving a datafile from File System to ASM

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