RMAN Backup With Compression

I repeated the test from the previous post but this time I tried to compress the backup. At this stage I need your help. I believe I have used the free compression which does not require an extra licence. If somebody who knows more about this than me could add a comment below, telling me if I am right or wrong, that would be very helpful. I backed up the database as before:

C:UsersAJ0294094>rman nocatalog (more...)

RMAN Backup Without Compression

I wanted to test the effect of RMAN backup compression on an Oracle 11.2.0.1 database running on Windows. I configured the flash recovery area, closed the database and mounted it. Then I did a backup without compression:

C:UsersAJ0294094>rman nocatalog target=andrew/reid

Recovery Manager: Release 11.2.0.1.0 - Production on Fri Mar 11 18:42:42 2016

Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.

connected to target database: (more...)

Creating Tables in the UNDO Tablespace??

I was reading an article written by Martin Widlake in Oracle Scene Issue 58 (Autumn/Winter 2015). It said:

The second new item is the UNDO tablespace. This is a special tablespace that is only used for internal purposes and one that users cannot put any tables or indexes into.

This seemed perfectly reasonable so I wondered what might happen if I tried to do it. In an Oracle 9.2.0.7 database Oracle returned (more...)

SELECTs Do Not Block UPDATEs

I went on my first DBA course in 1997 and the lecturer there explained that readers do not block writers in an Oracle database. I had an issue recently which appeared to contradict this so I have reproduced it below in an Oracle 11.2.0.1 database.
 
I noticed in OEM that there was some issue in the database. As usual, click on the images to enlarge them and bring them into focus (more...)

ORA-28405

This post is an update to an earlier one, which I have now deleted. I tested the first part of it in an Oracle 11.1.0.6 database. First I created a role which was identified by a password:
 
SQL> conn / as sysdba
Connected.
SQL> create role low identified by secret_password
  2  /
 
Role created.
 
SQL>
 
I granted the role to a user and made sure it had (more...)

DBMS_STATS Causes ORA-00600 [15851]

Uncategorized
| Apr 3, 2013
I noticed this in an Oracle 11.2.0.1.0 database. DBMS_STATS failed with an ORA-00600 and the first argument was [15851]. On investigation, it seemed to have something to do with the fact that the table had a function based index:
 
SQL> SELECT COUNT(*) FROM DBA_INDEXES