APEX 5.0.1 : We’re all patched up.

APEX 5.0.1 was released about a week ago. I started to patch some stuff straight away. We were already on APEX 5.0 across the board, so we didn’t need to do any full installations, just patches.

During the patching I noticed we were getting some issues with supposed misconfiguration of static files. After clearing my browser cache, the message went away, so I tweeted this.

“Regarding APEX 5.0.1 patch. Clear your (more...)

MobaXterm 8.0

command-promptI just noticed MobaXterm 8.0 was released a few days go.

Downloads and changelog available in the usual places.

Happy unzipping!

Cheers

Tim…


MobaXterm 8.0 was first posted on July 24, 2015 at 3:19 pm.
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Subquery Factoring (9)

Several years go (eight to be precise) I wrote a note suggesting that Oracle will not materialize a factored subquery unless it is used at least twice in the main query. I based this conclusion on a logical argument about the cost of creating and using a factored subquery and, at the time, I left it at that. A couple of years ago I came across an example where even with two uses of a (more...)

ORA-39001, ORA-39000 and ORA-39142

I exported 3 large tables from an Oracle 11.2.0.4.0 database then tried to import them into an Oracle 11.1.0.6.0 database but the impdp failed as follows:

PQECOG3 /database/DB_exports/andrew > impdp / parfile=params
 
Import: Release 11.1.0.6.0 - 64bit Production on Wednesday, 22 July, 2015 11:37:44
 
Copyright (c) 2003, 2007, Oracle.  All rights reserved.
 
Connected to: Oracle Database 11g Enterprise Edition (more...)

ORA-15410: Disks in disk group do not have equal size

12.1.0.2 ASM introduced a new feature which might prevent you from adding dissimilar size disks into a normal or high redundancy disk groups. The relevant MOS note is Doc ID 1938950.1.

Unfortunately I've found that some information in this note requires further clarification.

COMPATIBLE.ASM

The note suggests that the check is only enforced when the Disk Group has 'COMPATIBLE.ASM'='12.1.0.2' attribute set. This is incorrect and can (more...)

WordPress 4.2.3 : Hurry up and … let it fix itself…

WordPress 4.2.3 has been released.

It contains fixes for some pretty nasty stuff. Usually, the updates have to be manually triggered for a day or so before the auto-update feature picks them up. I was on the blog this morning and there were no “manually triggered auto-updates” available, so it looks like this one has been pushed straight out, which probably makes sense.

By the time you’ve read this you are probably up (more...)

Introducing FETCHER in a running replication process

This is no regular bit of work and it will probably (and hopefully) never hit you in a production setup…

The prerequisite is that you know how on-line data replication in general, and Dbvisit Replicate specifically, work.

The following case is true:
I had half of a replication pair running.
It means that the MINE process was running, converting REDO-log in PLOG-format. The APPLY process had not yet started because the target database was (more...)

Emergency Monitoring, Real-Time ADDM, Compare Period ADDM, and Active Session History (ASH) Analytics

My recent dalliance with YouTube (141 subscribers and growing! :) ) has left the blog feeling a little bit unloved of late, but then why write when you can waffle in the car? :)

Anyway, the 12c learning train keeps on rolling. I’ve recently put the following articles live.

ora-20011-Approximate ndv failed : ora-00600

When you’re run adstats.sql script on database, you should get this error if not set the ORA_NLS10 path in environment. So please set the path and restart the database

ORA_NLS10=/u01/app/oracle/db/tech_st/12c/nls/data/9idata; export ORA_NLS10


Do you pass the AUTHID test…..?



Now I'm not sure whether i already knew this and had just forgotten or whether i had genuinely missed this little 'feature' but it's useful to know this exists even if it's just so you don't look stupid when someone shows it to you.....

For you plsql people out there (i know some of you survived the onslaught of java and dotnet) you'll be familiar with the AUTHID clause within compiled plsql units - can't (more...)

Issues around recreating a standby database in 12c

When you create a database in 12C it now creates a resource in HAS/CRS , which isn’t a problem

However, when you come to recreate a standby database, probably because it has got such a big lag that it is quicker to recreate than recover the log files, then you will see the following error message :-

 

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command  (more...)

Invalidation

Someone who attended my sessions at the Bucharest Oracle Summit earlier on this year sent me an example of a quirky little bug, possibly related to the newer “fine-grained” invalidation mechanisms, possibly related to ANSI syntax SQL, that’s very easy to reproduce. (That’s always nice for Oracle support – a perfect test case.)

All it takes is two tables and a packaged procedure that queries those tables. The package is coded to do something (more...)

12c upgrade overview of oracle applications 12.1.3

This step by step document will guide to upgrade the database version from 11.2.0.2 to 12.1.0.2 of oracle applications 12.1.3

12c upgrade overview of oracle applications 12


The Leap Second is No Laughing Matter (if you have java on an older Linux kernel)

Earlier this month we began getting frequent email warnings from our EM12c server that some agents were experience read time outs. Then we saw that the emagent java process was using A LOT of CPU, regularly around 500% but sometimes as high as 800% as seen from "top". Restarting the agent did nothing.

I opened an SR with Oracle Support, where I was first instructed to apply a JDBC patch and then a PSU agent (more...)

Database migration with datapump 10g->12c



Finally one of our 'legacy' systems is being brought up to date after many years of languishing on oracle 9. We're so far behind that a migration route is not straightforward (at least one that runs in a reasonable timeframe) so we are left with this convoluted route (there are reasons for this but i won't go into that for now - in fact i'm just going to cover one of these sections).

So general (more...)

Upgrade to Oracle 12c, Get the Huge Trace Files for Free!

Last week we began testing a copy of our production database on Oracle 12c (12.1.0.2). This past weekend we were alerted that the disk holding our ADR diagnostic directory was near full. We noticed some pretty big (and recent) trace files there. Then it happened twice more. This last time filled the disk before we could get to it (thankfully only dev, and during the evening), meaning it filled up fast. The (more...)

So long, and thanks for all the fish

After fifteen years at the helm of Scale Abilities, I have decided it's time for the next chapter. Scale Abilities is closing down and I'm taking a job with another company. Fifteen years is a long time, especially in the technology business, and it might be a bit of a shock to those that have […]

Snap Cloning Databases on Exadata using Enterprise Manager

By Subhadeep Sengupta (Oracle)
Historically, Exadata has mostly been deployed for heavy, production workloads, leaving cheap commodity hardware and third-party storage to perform as infrastructure for Development and Testing. From the viewpoint of Enterprise Manager, we have seen customers clone production databases running on Exadata to secondary storage such as ZFS Storage Appliance or even third-party NAS or SAN for the purpose of testing. Customers mainly used RMAN (with or without Enterprise Manager) to (more...)

Oracle Management Database in Grid Infrastructure: -MGMTDB

Oracle,

Why? Why is is now mandatory to have the cluster management database as an Oracle CDB, with a PDB having the same name as the cluster? It’s not that I object to having another 1GB of memory lost to this DB, and up to 10GB of disk in the initial ASM Disk Group. It’s this:

You have called it -MGMTDB

That means I now have directories all over my Linux / Unix structure called (more...)

Oracle on 4096 (4k) sector disks don’t work (ish)

I recently came across 4K (4096 byte) sector drives. They are a fairly new thing and have come about so drives can exceed the 2TB limit imposed by having 512byte sectors. The details behind this can be found here, in much greater detail than I need to understand.

What I do understand is that Oracle doesn’t deal with 4K sectors (4Kn) very well and it shows up in a couple of ways. Don’t get me (more...)