Exadata Patching Introduction

These I consider the most important points about Exadata Patching:

Where is the most recent information?

MOS Note 888828.1 is your first read whenever you think about Exadata Patching

What is to patch with which utility?

Exadata Patching

Expect quarterly bundle patches for the storage servers and the compute nodes. The other components (Infiniband switches, Cisco Ethernet Switch, PDUs) are less frequently patched and not on the picture therefore.

The storage servers have their software image (more...)

Reading Oracle memory dumps

Every DBA working with the Oracle database must have seen memory dumps in tracefiles. It is present in ORA-600 (internal error) ORA-7445 (operating system error), system state dumps, process state dumps and a lot of other dumps.

This is how it looks likes:

Dump of memory from 0x00007F06BF9A9E00 to 0x00007F06BF9ADE00
7F06BF9A9E00 0000C215 0000001F 00000CC1 0401FFFF  [................]
7F06BF9A9E10 000032F3 00010003 00000002 442B0000  [.2............+D]
7F06BF9A9E20 2F415441 31323156 4F2F3230 4E494C4E  [ATA/V12102/ONLIN]
7F06BF9A9E30 474F4C45 6F72672F 315F7075  (more...)

Disruptive Innovations

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photo by Tsahi Levent-Levi

by Iggy Fernandez

excerpted from The Twelve Days of NoSQL (http://iggyfernandez.wordpress.com/)

NoSQL and Big Data are “disruptive innovations” in the sense used by Harvard professor Clayton M. Christensen. In The Innovator’s Dilemma: When New Technologies Cause Great Firms to Fail, Christensen defines disruptive innovations and explains how they eventually lead to the failure of the established players who ignored them:

“Generally, disruptive innovations were technologically (more...)

Friday Philosophy – my Funniest “PC Support” Call in Years

Those of us who work in IT often find ourselves being called by friends and relatives to help with issues they have with their home computer. No matter what branch of IT we work in, it’s IT {they figure} so of course we can fix their PC problems. It’s like any scientist can probably explain what the Higgs Boson really is and reverse the polarity of the neutron flow.

Mothers and other elderly relatives are (more...)

The importance of backups and disaster recovery plans

Having tweeted, “When was the last time you practised the recovery of each of your production databases?”, a few days before, I was presented with a very real DR situation for my website.

On Wednesday my website went down while I was at my office Christmas lunch. I restarted it from my phone and it was all up, but I got a message saying one of the RAID1 disks was dead. I do nightly file system and (more...)

Fun : Endorse my “new” skills…

For a bit of fun I’ve added the following “new” skills to my LinkedIn profile.

  • Crocodile Wrestling
  • Plate Spinning
  • Fragile Methodologies
  • Laundry

It would be really cool if we could get them to the top 4 in the list of my endorsed skills. Please make it a happy holiday by endorsing these. :)

Remember, this only works if you actively don’t endorse the other things!

Cheers

Tim…

PS. I’ve written before about how I think LinkedIn (more...)

EM12c and the Optimizer Statistics Console

Today we’re going to review another great feature in the EM12c that you may not have realized was available.  Once logged into a database target, click on the Performance menu and navigate to the Optimizer Statistics Console:

opt1

Optimizer Statistics Console Page

The new console page is clean, easy to navigate and has great access points to manage and monitor optimizer statistics for the given database target.

opt2

We’ll actually start at the bottom of the (more...)

WordPress 4.1 “Dinah”

WordPress 4.1 “Dinah” has been born.

The upgrade will probably happen automatically in a few days, but if you go on to you blog now you can force the update. We will no doubt get a 4.1.1 very soon, as this always seems to happen. :)

There is a list of new features that I think is meant to thrill me, but I’m looking at everything post upgrade and it all seems pretty much (more...)

SUCCESS and FAILURE Columns in DBA_STMT_AUDIT_OPTS

I tested this in Oracle 10.2. DBA_STMT_AUDIT_OPTS records auditing options which are currently in effect. If no auditing has been requested, it will be empty:
 
SQL> select user_name, audit_option, success, failure
  2  from dba_stmt_audit_opts
  3  /
 
no rows selected
 
SQL>
 
You can audit successful connections as follows:
 
SQL> audit create session by system whenever successful
  2  /
 
Audit succeeded.
 
SQL>
 
This will then (more...)

The Best Laid Plans

In a forum I contribute to the following question was asked:


Can adaptive cursor sharing (ACS) depend on execution order ?

The issue described a relatively basic query that changed execution plans apparently due to the order the query statements were run based on bind variable values. It’s an interesting issue that testing has verified. The tests are reproduced below, in abbreviated form, so let’s look at what was executed and what execution plans were used.

(more...)

Simplicity Is Good!

by James Morle

This article is about the importance of appropriately simplistic architectures. I frequently get involved with the creation of full-stack architectures—in particular the architecture of the database platform. There are some golden rules when designing such systems, but one of the most important ones is to keep the design as simple as possible. This isn’t a performance enhancement; this is an availability enhancement. Complexity, after all, is the enemy of availability.

Despite it (more...)

Oracle 12.1.0.2 Bundle Patching

I’ve spent a few days playing with patching 12.1.0.2 with the so called “Database Patch for Engineered Systems and Database In-Memory”. Lets skip over why these not necessarily related feature sets should be bundled together into effectively a Bundle Patch.

First I was testing going from 12.1.0.2.1 to BP2 or 12.1.0.2.2. Then as soon as I’d done that of course BP3 was released.

So (more...)

Performance Issues with the Sequence NEXTVAL Call

Is SELECTing from a sequence your Oracle Performance Problem? The answer to that question is: it might be!

You wouldn’t expect a sequence select to be a significant problem but recently we saw that it was—and in two different ways. The issue came to light when investigating a report performance issue on an Oracle 11.2.0.4 non-RAC database. Investigating the report problem required an AWR analysis and a SQL trace (actually a 10046 (more...)

ORA-28043: Invalid Bind Credentials for DB-OID Connection

Have you ever encountered this error connecting to a DB using global authentication against OID? Was re-registration a temporary workaround, but the issue came back after some time? Check out this solution for ORA-28043: invalid bind credentials for DB-OID connection.

During a long project which included changing human account’s authentication method from local to global on several databases, users started to report ORA-28043 after a couple of days.

$ sqlplus rambo@orcl

SQL*Plus: Release 11. (more...)

RAC One Node 12c-revisited on ODA 12.1.2.1.0 featuring database on ACFS

Thanks to Andy Colvin (@acolvin) and the Enkitec lab I have been able to get my hands on an ODA X4-2. And since that’s a lot quieter than turning on my own lab server, and also a lot faster I used the environment to test RAC One Node in 12.1.0.2.1. I recently had a question from a customer about the usefulness of the solution and what it brings to the HA (more...)

Oracle database operating system memory allocation management for PGA – part 4: Oracle 11.2.0.4 and AMM

This is the 4th post in a series of posts on PGA behaviour of Oracle. Earlier posts are: here (PGA limiting for Oracle 12), here (PGA limiting for Oracle 11.2) and the quiz on using PGA with AMM, into which this blogpost dives deeper.

As laid out in the quiz blogpost, I have a database with the following specifics:
-Oracle Linux x86_64 6u6.
-Oracle database 11.2.0.4 PSU 4
-Oracle (more...)

Oracle AWR Reports: When IOStats Lie

graph

If you’ve been unfortunate enough to follow my dithering on Twitter recently you’ll know that I’ve been lurching between thinking that there is and isn’t a problem with Oracle’s tracking of I/O statistics in its AWR reports.

I’m now convinced there is a problem, but I can’t work out what causes it… so step 1 is to describe the problem here, after which step 2 will probably be to sit back and hope someone far (more...)

Interview with Tim Gorman: How I accidentally dropped the 16TB main index

Tim Gorman is a technical consultant for Delphix (http://www.Delphix.com), who enable database and storage virtualization to increase the agility of IT development and testing operations. He has co-authored six books, tech-reviewed eight more, and written articles for RMOUG SQL_Update and IOUG SELECT magazines. He has been an Oracle ACE since 2007, an Oracle ACE Director since 2012, a member of the Oak Table Network since 2002, and has presented at Oracle (more...)

Execution Plans

This is the index to a series of articles I’ve been writing for redgate, published on their AllThingsOracle site, about generating and reading execution plans. I’ve completed a few articles that haven’t yet been published, but I’ll add their URLs when they’re available.

I don’t really know how many parts it’s going to end up as – there’s an awful lot that that you could say about reading execution plans, even when you’re trying to cover just (more...)

New Cookbook: Oracle Linux 6 Update 5 within an Oracle VM Template

Oracle-VMI’ve posted a new installation cookbook for using Oracle within a virtual machine running on Oracle VM. Surprisingly, I was unable to come up with a satisfactory method of accessing external storage that did not involve the use of Oracle ASMLib

Oracle Linux 6 Update 5 within an Oracle VM Template


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