NZOUG14 Beckons

New Zealand is famous for Kiwis, pristine landscape, and New Zealand Oracle User Group (NZOUG) conference.  The location of choice is New Zealand when it comes to making Lord of the Rings and making Oracle Lord of the Databases.


NZOUG 2014 will be held 19–21 November in the Owen G. Glenn Building at the University of Auckland. The main conference will be held on the 20th and 21st, preceded by a day of workshops (more...)

Setting Up Chargeback in EM 12.1.0.4

Some time back, I posted a blog entry about Metering and Chargeback in Enterprise Manager, where I covered the basic capabilities of the Chargeback Application. It’s taken me some time to get back to the promised followup blog post on setting up Chargeback, what with Oracle Open World getting in the way of things, but that’s what I’m finally doing now.

Chargeback can be setup in EM12c by any user with the EM_CBA_ADMIN role, or (more...)

Roll up! Roll up! Nothing new to see here! (Database Web Services)

Over the years I’ve written loads of stuff about consuming and publishing web services directly from the database. I’ve been doing quite a bit of this at work recently and I realised how difficult it is to find all the pieces, since they are spread across multiple articles, spanning multiple database versions. In an attempt to give a single point of entry I’ve written this very brief article.

It’s really (more...)

Just a couple of screenshots of sqlplus+rlwrap+cygwin+console

I previously wrote that I peeped the idea about showing the session information in terminal title from Timur Akhmadeev’s screenshots, and Timur wrote:

I’m using (a bit modified) Tanel Poder’s login.sql available in his TPT scripts library: http://tech.e2sn.com/oracle-scripts-and-tools

Scripts:
Tanel’s i.sql
My title.sql and on_login.sql

Colored prompt is the one of many features of rlwrap.

Screenshots:
Connected as simple user:
baikal-xtender
Connected as sysdba:
xtsql-sysdba

SQL*Plus on OEL through putty:
putty-to-oel-sqlplus

@inc/title “*** Test ***”
inc-title-test

Bug 8477973

I ran the following query on an Oracle 11.1.0.6 database but it failed with an ORA-02020:
 
SQL> SELECT ppc.sttlmnt_dt day_date
  2  FROM   vrm_d18_ppc   ppc,
  3         meter_nhh     mtr,
  4         mtd_registers reg
  5  WHERE  ppc.tm_pttrn_rgm = reg.tpr
  6  AND    TO_NUMBER(ppc.stndrd_sttlmnt_cnfgrtn_id) = mtr.std_stlmnt_config_id
  7  AND    ppc.prfl_clss_id = mtr.profile_class_id
  8  AND    ppc.gsp_grp_id = mtr.gsp_group_id
  9  AND    reg. (more...)

Update OEM Harvester after 12.1.0.4 Upgrade

After we upgraded our OMS environment we realized that our Harvester wasn’t uploading data to MOS anymore.  Of course, you say, you just replaced your former ORACLE_HOME with a new home for 12.1.0.4.

Procedure:

1. Download p5567658_120030_Linux-x86-64.zip or the latest OCM installer for your environment.  You’ll find a tab for downloading OCM on your front page in MOS.  While you are there you should also download the Quick Start guide.

2. Unzip (more...)

DevOps and Databases?

I’m super looking forward to next weeks DevOps Enterprise Summit in San Francisco. You might ask “Why?!” since I’m a database guy and not a DevOps guy.  I can understand that reaction.

I don’t know about you, but when I hear the term DevOps I have to roll my eyes and think “oh, the latest greatest tech industry buzzword.” So why would I as a DBA care about DevOps? With DevOps, as with (more...)

What to do if edb360 takes long to run

Every once in a while it comes to my attention that edb360 takes several hours to run. What can be done? My advice is to let it run for several hours if possible. In most environment it completes in less that 1 hour, but I have seen cases where it may take 5 or 6. The reason is simple: too many SQL statements to execute. And some of those queries are executed on top of (more...)

Tweaked bind variable script

I modified the bind variable extraction script that I normally use to make it more helpful to me.

Here was my earlier post with the old script: blog post

Here is my updated script:

set termout on 
set echo on
set linesize 32000
set pagesize 1000
set trimspool on

column NAME format a3
column VALUE_STRING format a17

spool bind2.log

select * from 
(select distinct
to_char(sb.LAST_CAPTURED,'YYYY-MM-DD HH24:MI:SS') 
  DATE_TIME,
sb.NAME,
sb.VALUE_STRING 
from 
DBA_HIST_SQLBIND  (more...)

Please look at latest Oct 2014 Oracle patching

This one looks like the real thing ... getting advice to "not skip" the patching process for a whole bunch of things included here.

I'm just saying ...

Patching Time

Just a quick note to point out that the October PSU was just released. The database has a few more vulnerabilities than usual (31), but they are mostly related to Java and the high CVSS score of 9 only applies to people running Oracle on windows. (On other operating systems, the highest score is 6.5.)

I did happen to glance at the announcement on the security blog, and I thought this short (more...)

Understanding Flash: Garbage Collection Matters

garbage-collection

In the last post in this series I discussed some of the various tasks that need to be performed by the flash translation layer – the layer of abstraction that sits between us and the raw NAND flash on which we desire to store our data. One of those tasks is the infamous garbage collection process (or “GC”) – and in these next couple of posts I’m going to look into GC a little deeper.

But (more...)

Oracle fanboy and blind to the truth?

I had a little exchange with someone on Twitter last night, which was initiated by him complaining about the cost of Oracle and predicting their demise. Once that was over I spent a little time thinking about my “fanboy status”.

If you know anything about me, you will know I’m an Oracle fanboy. I’ve spent nearly 20 years doing this stuff and the last 14+ years writing about it on the internet. If I wasn’t (more...)

12c: Access Objects Of A Common User Non-existent In Root

RSS content

In a multitenant environment, a common user is a database user whose identity and password are known in the root and in every existing and future pluggable database (PDB). Common users can connect to the root and perform administrative tasks specific to the root or PDBs. There are two types of common users :

  • All Oracle-supplied administrative user accounts, such as SYS and SYSTEM
  •  User created common users- Their names  must start with (more...)

Log buffer space

Introduction

Log buffer space is a simple, yet frequently misunderstood wait event. The main reason for that is probably its name. It sounds as if it points immediately to the answer: if space in the log buffer is the issue, then increasing it surely should resolve it. Well, unfortunately even though log buffer space is simple, it’s not that simple.

Log buffer

Log buffer is an area in memory (SGA, to be more specific) where (more...)

Let the Data Guard Broker control LOG_ARCHIVE_* parameters!

When using the Data Guard Broker, you don’t need to set any LOG_ARCHIVE_* parameter for the databases that are part of your Data Guard configuration. The broker is doing that for you. Forget about what you may have heard about VALID_FOR – you don’t need that with the broker. Actually, setting any of the LOG_ARCHIVE_* parameters with an enabled broker configuration might even confuse the broker and lead to warning or error messages. Let’s look (more...)

Exadata and Virtual Private Database: will it offload my query?

During one of the classes I taught about Exadata optimisations I had an interesting question:

If I am using VPD, will Exadata still offload the query?

Background is that we discussed function offloading, and the meta-view v$sqlfn_metadata. It turned out that SYS_CONTEXT() is not offloadable in 11.2.0.4.

SQL> select name,datatype,analytic,aggregate,offloadable,descr
  2  from v$sqlfn_metadata where name = 'SYS_CONTEXT';

NAME                                               DATATYPE ANA AGG OFF DESCR
-------------------------------------------------- -------- --- --- --- ------------------------------
SYS_CONTEXT                                        UNKNOWN  NO   (more...)

Everybody is writing, few people actually reading

When I started this blog, almost 6 years ago I had a clear purpose: give back. I had extracted so much useful information from the internet and in early 2009 it was time to give back. Publish my tricks, secrets, tips, etc. I then moved into Oracle and now I can’t disclose everything I know. […]

Memory

On a client site recently, experimenting with a T5-2 – fortunately a test system – we decided to restart an instance with a larger SGA. It had been 100GB, but with 1TB of memory and 256 threads (2 sockets, 16 cores per socket, 8 threads per core) it seemed reasonable to crank this up to 400GB for the work we wanted to do.

It took about 15 minutes for the instance to start; worse, it (more...)

When to use the NOLOCK hint in SQL Server

I frequently hear of, and see, developers and DBA’s using the NOLOCK hint within SQL Server to bypass the locking mechanism and return their data sets as soon as possible. There are times when this is OK, such as when you are running an ad hoc query and are only interested in approximate results. It is somewhat less OK to write this hint into application code and reports, unless you don’t actually care whether the (more...)