Data Pump or Data Pain

WARNING: Rants ahead.

Simple request migrate schema from one database to another, right?

Create new database perform schema export and import this only works if objects are self contained.

The following objects are missing from schema export to name a few.

Here’s what was done and hopefully did not missed anything. TBS was pre-created.

$ cat impdp_full_public.par

userid="/ as sysdba"

$ cat (more...)

Oracle Database 12.2 released for Exadata on-premises

We live in exciting times, Oracle Database 12.2 for Exadata was released earlier today.

The 12.2 database was already available on the Exadata Express Cloud Service and Database as a service for a few months now.

Today, it has been released for Exadata on-premises, five days earlier than the initial Oracle announcement of 15th Feb.

The documentation suggests that to run 12.2 database you need to run at least 12.1.2. (more...)

Provisioning a VFile App to Connect to a VDB

I ran across an article from 2013 from Straight Talk on Agile Development by Alex Kuznetsov and it reminded me how long we’ve been battling for easier ways of doing agile in a RDBMS environments.

Getting comfortable with a virtualized environment can be an odd experience for most DBAs, but as soon as you recognize how similar it is to a standard environment, we stop over-thinking it and it (more...)

TCP WMEM Fault in Delphix AWS Target

So you thought you were finished configuring your AWS target, eh?  I already posted a previous time on how to address a fault with the RMEM, but now we’re onto the WMEM.  Wait, WM-what?

No, I fear a DBAs work is never over and when it comes to the cloud, our skill set has just expanded from what it was when we worked on-premise!

Our trusty Delphix (more...)

SLOB Use Cases By Industry Vendors. Learn SLOB, Speak The Experts’ Language.

This is just a quick blog entry to showcase a few of the publications from IT vendors showcasing SLOB. SLOB allows performance engineers to speak in short sentences. As I’ve pointed out before, SLOB is not used to test how well Oracle handles transaction. If you are worried that Oracle cannot handle transactions then you have bigger problems than what can be tested with SLOB. SLOB is how you test whether–or how well–a platform can (more...)

Fixing blank charts on ambari home page (Hortonworks Data Platform)

I created a 4 node container based (Proxmox LXC) Hortonworks Data Platform 2.5 Hadoop cluster recently and all went well apart from all the charts on the Ambari homepage were blank or showing “N/A”, like this:

An outline of the environment:

  • 4 node cluster of LXC containers on Proxmox host
  • Centos 7 Linux OS
  • Nodes are called bishdp0[1-4], all created from same template and identical configuration
  • All containers are on (more...)

Index bouncy scan

There’s a thread running on OTN at present about deleting huge volumes of duplicated data from a table (to reduce it from 1.1 billion to about 22 million rows). The thread isn’t what I’m going to talk about, though, other than quoting some numbers from it to explain what this post is about.

An overview of the requirement suggests that a file of about 2.2 million rows is loaded into the table every (more...)

Oracle : Sad Times

During my Oracle’s Cloud Licensing Change : Be Warned! post I said, “It’s getting really hard to remain an Oracle fanboy these days!”

Since then I’ve heard a number of stories of customers being contacted and told they need to double their licensing for systems on the cloud. This is for existing systems that were “fully licensed” before 23rd January 2017. I’ve also heard of a number of big companies that have now made policy changes (more...)

Preparing AWS for the Delphix Trial

There are more configurations for AWS than there are fish in the sea, but as the rush of folks arrive to test out the incredibly cool AWS Trial for Delphix, I’ll add my rendition of what to look for to know you’re AWS setup is prepped to successfully deploy.

The EC2 Dashboard View

After you’ve selected your location, set up your security user/group and key pairs, (more...)

Steps to Recreate Central Inventory in Real Applications Clusters (Doc ID 413939.1)



$ $ORACLE_HOME/OPatch/opatch lsinventory -detail -oh $ORACLE_HOME

Oracle Interim Patch Installer version
Copyright (c) 2017, Oracle Corporation.  All rights reserved.

Oracle Home       : /u01/app/oracle/product/12.1.0/db_1
Central Inventory : /u01/app/oraInventory
   from           : /u01/app/oracle/product/12.1.0/db_1/oraInst.loc
OPatch version    :
OUI version       :
Log file location : /u01/app/oracle/product/12.1.0/db_1/cfgtoollogs/opatch/opatch2017-02-08_15-56-03PM_1.log

List of Homes on this  (more...)

ilOUG meetup: Oracle 12c New Features For Better Performance (slides)

It’s been a while since the Israeli user group (iloug) had a technology meetup (SIG meeting). The last time that happened was over two years ago – and since then, we only had the bigger conferences with guests from all over the world. Yesterday we renewed that long time tradition and held such a meetup.

Although I am not part of the OUG board (and not for the lack of trying, just no elections for (more...) -pre crsinst NTP failed PRVF-07590 PRVG-01017

12c ( RAC Oracle Linux Server release 7.3
/u01/software/grid/ stage -pre crsinst -n node1,node2 -verbose

Starting Clock synchronization checks using Network Time Protocol(NTP)...

Checking existence of NTP configuration file "/etc/ntp.conf" across nodes
  Node Name                             File exists?            
  ------------------------------------  ------------------------
  node02                                yes                     
  node01                                yes                     
The NTP configuration file "/etc/ntp.conf" is available on all nodes
NTP configuration file "/etc/ntp.conf" existence check passed

Checking daemon liveness...

Check: Liveness for "ntpd"

Parting With ocm.rsp Isn’t Really Sweet Sorrow…

Now that we’re well into 2017, let’s sit back and ask the question: “What was the best news of 2016 in the Oracle ecosystem?”

Oracle Linux Update from 7.2 to 7.3 crashes with uncorrectable CPU error

During the Upgrade of Oracle Linux 7.2 to 7.3 with “yum update”, when updating the microcode_ctl package, the system crashed and firmware reported an uncorrectable CPU error after reboot.

It turned out that the update of the package in combination with specific Intel CPUs causes the issue. In the meantime, there is a red hat bug and solution available.



  • MOS: The system could (more...)

Empowering Your Slides- Tips with PowerPoint

Ah, yes, it’s that RMOUG Training Days time of the year again!

As a techie, I didn’t put a lot of time into my slides when I first started presenting, thinking I’d simply dazzle them with my amazing knowledge.

What I found is that slide deck skills don’t just help your presentation, they help you tell the story better, which should be the goal of every presenter.  No matter how (more...)

Common Users in #Oracle 12c – what are they good for?

Common vs Local Users

Common vs Local Users

A 12c Multitenant Database is designed to make consolidation easier. The PDBs have not only their application data in separate tablespaces, they also have their application metadata in separate SYSTEM tablespaces. That’s what makes it so easy and fast to unplug a PDB.

The SYSTEM tablespace of the CDB contains the internal metadata that is shared by all PDBs. Internal metadata (the dictionary tables) and internal objects (like the DBMS* packages) (more...)

Oracle Database Cloud (DBaaS) Performance – Part 4 – Network

In the last part of this installment I'll have a brief look at the network performance measured in the Oracle DBaaS environment, in particular the network interface that gets used as private interconnect in case of RAC configuration. The network performance could also be relevant when evaluating how to transfer data to the cloud database.

I've used the freely available "iperf" tool to measure the network bandwidth and got the following results:

[root@test12102rac2 ~]# iperf3 (more...)

Exadata Cell Patching – USB I/O Errors

I was playing around with the Exadata X2-2 in the Enkitec lab this weekend, and hit an interesting issue when patching the storage servers.  We were taking the system up to version for testing purposes.  I fired off the patchmgr script, and one of the storage servers failed when beginning the first phase of the patching cycle:

[root@enkdb03 patch_12.]# ./patchmgr -cells cell_group -patch -ignore_alerts

12c Database spfile Parameter alias is not created in ASM Diskgroup (Doc ID 1950769.1)

This is new as of

$ srvctl config database -d hawk
Database unique name: hawk
Database name: hawk
Oracle home: /u01/app/oracle/product/12.1.0/db_1
Oracle user: oracle
Spfile: +DATA/HAWK/PARAMETERFILE/spfile.264.934897017
Password file: +DATA/hawk/orapwhawk
Start options: open
Stop options: immediate
Database role: PRIMARY
Management policy: AUTOMATIC
Server pools: 
Disk Groups: DATA
Mount point paths: 
Type: RAC
Start concurrency: 
Stop concurrency: 
OSDBA group: dba
OSOPER group: 
Database instances: hawk1,hawk2
Configured nodes: hawk01,hawk02

Connecting to PostgreSQL

To connect to PostgreSQL, the following parameters are required:

1. Host or Host Address
2. Port
3. Database Name
4. User
5. Password

As mentioned, in my earlier post, like sqlplus in oracle, PostgreSQL has “psql”.
To connect any PostgreSQL db, you can use

1. psql
2. pgAdmin4
3. phpPgAdmin

Using psql

The default port number for PostgreSQL is 5432.

i) psql -h hostname -p port -d dbname -U username

bash-3.2$ psql -h localhost  (more...)