Oracle introduces Recertification

So today I was disappointed to read that Oracle introduced a recertification requirement for the Oracle Database Administrator certificates:

The Oracle Certification Program is implementing a recertification requirement for our Oracle Database Administration credentials.
This new policy requires you as an Oracle Database credential holder to demonstrate your currency with the most recent trends, techniques and best practices in Oracle Database technology.

More details can be found on the new website for these new requirements.

Recertification, really? And probably you’ll then proceed to tell me that I need to attend an Oracle University course to upgrade my certification to a newer release, yeah? This is bullshit…

ORA-07274: spdcr: access error, access to oracle denied

So today, during the upgrade of a database, all other databases using the same ORACLE_HOME stopped dead in their tracks. The ALERT log reported the following:

2014-09-30 13:34:41.622000 +02:00
Archived Log entry 24398 added for thread 1 sequence 24398 ID 0x2d91d796 dest 1:
2014-09-30 13:47:39.764000 +02:00
Errors in file /u00/app/oracle/diag/rdbms/kdb12345/kdb12345/trace/kdb12345_psp0_57147560.trc:
ORA-07274: spdcr: access error, access to oracle denied.
IBM AIX RISC System/6000 Error: 2: No such file or directory
PSP0 (ospid: 57147560): terminating the instance due to error 7274
2014-09-30 13:47:41.346000 +02:00
System state dump requested by (instance=1, osid=57147560 (PSP0)), summary=[abnormal instance termination].
System State dumped to trace file /u00/app/oracle/diag/rdbms/kdb12345/KDB12345/trace/KDB12345_diag_49938448_20140930134741.trc
2014-09-30 13:47:44.779000 +02:00
Instance terminated by PSP0, pid = 57147560

Hmm, so what to do? In the trace file, we find out a bit more:

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Oracle Primary Key Sequence Performance

With Oracle 12c, Oracle introduced a new way to insert primary keys into tables: The GENERATED BY DEFAULT and DEFAULT keywords.

In this post, I want to compare the performance of different methods to insert a primary key into a table in Oracle. The comparison will also include older methods, such as using a trigger or specifying the primary key in the INSERT statement. These methods can also be used in Oracle versions earlier than 12c.

First of all, let’s look at the possible ways to insert the value of a sequence into a table:

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Parameters of Pluggable Databases

When working with the new multitenant architecture of Oracle 12c, one is often confronted with questions like “Ok, is this or that possible in the pluggable database? And where is that value stored?”. In this article, I want to show you where the parameters of the pluggable databases are stored. Hint: there is no SPFILE for a pluggable database!

Consider the following container database (CDB), named “cdb2”, with the following pluggable databases (PDBs). Using SQL*Plus, connected to the CDB, we can issue show pdbs to get a list of the PDBs and their status:

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ORA-01722 during upgrade 10.2 to 11.2

As we are migrating the last databases from Oracle 10gR2 to the latest release, there are some errors that we stumbled upon along our way. For example, when we tried to upgrade one particular database, during the upgrade the following error was thrown:

  2   WHERE
  3    value = 'TRUE' and parameter = 'Oracle Database Vault';
ERROR at line 1:
ORA-01722: invalid number

Ouch. That is something that you do not want to see during an upgrade! Needless to say, the upgrade won’t continue here, so how to fix this?

Well, basically this is a well-known error, and there is MOS note 1409844.1 that describes how to fix the problem: Catupgrd Returns : Ora-01722 Select To_number(‘DATA_VAULT_OPTION_ON’) From V$option

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Connect to a PDB using SID

To connect to a PDB, you have to use the service name of the pluggable database. But what when there is an older legacy application that can only use an SID to connect to a database? And what if we just migrated an older legacy database to a PDB? When starting the application, you might see something like:

ORA-12505: TNS:listener does not currently know of SID given in connect descriptor

There is a parameter called USE_SID_AS_SERVICE_listener that can be used to tell the listener to handle SIDs like service names. So the listener will interpret the SID given in the connection as a service name and will then connect you to the database.

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Oracle 12c: AFTER STARTUP trigger to open PDBs

Update: Starting with Oracle, it is possible to save a PDB state so this workaround is no longer necessary.

When starting up an Oracle 12c database with pluggable databases, the pluggable databases in a container database are not automatically opened, just placed in MOUNT mode. This can be a problem in some cases.

To automatically open the pluggable databases on startup, you’ll have to create an AFTER STARTUP trigger in the CDB. For my own reference, I will post such a trigger here:

CREATE TRIGGER open_all_pdbs
END open_all_pdbs;
/ cannot open shared object file: No such file or directory

Recently I had to install SQL*Plus on a Linux host. In order to do so, I downloaded the appropriate Oracle Instant Client packages from the Oracle site. For my installation, I chose the ZIP files. After I unzipped the client and tried to run sqlplus, I go the following error:

simon@pandora instantclient_11_2$ ./sqlplus
./sqlplus: error while loading shared libraries: cannot open shared object file: No such file or directory

Hmm. When I checked the directory with the sqlplus binary, the file was clearly there.

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Oracle Database 11g Administrator Certified Professional

I am happy to report that I finished my Oracle Certified Professional certification this Monday by taking the “1Z0-053 Oracle Database 11g: Administration II” exam. So officially, I am now a “Oracle Database 11g Administrator Certified Professional”.

Oracle Database 11g Administrator Certified Professional

While this certificate is certainly nice to have, I still think that there are many topics of Oracle Database that I still have to explore. So stay tuned for more insights in this blog :).

ASM: Device “/dev/xvdc1” is already labeled for ASM disk “”

In preparation for my OCP examination, I am currently playing around with ASM. For this purpose I am using an AWS instance to install and configure my database. So I added my disks, partitioned them using fdisk and installed ASMLib to manage them. But when I wanted to issue the createdisk command, this happened:

[root@ip-10-234-66-103 ~]# oracleasm createdisk DATA0 /dev/xvdc1
Device "/dev/xvdc1" is already labeled for ASM disk ""

So what is the problem here? Before deciding to use ASMLib, I tried to add the disks using only ASM commands from within the ASM instance, which failed for some reason. This is why I then switched to ASMLib.

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Hello world

My name is Simon Krenger, I am a Technical Account Manager (TAM) at Red Hat. I advise our customers in using Kubernetes, Containers, Linux and Open Source.


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