tnsping for DataGuard

I am preparing Dataguard for switchover with 1 primary and 3 standbys and should be able to tnsping all the services from log_archive_config=DG_CONFIG=DG_CONFIG=(HAWKA,HAWKB,HAWKC)

Not sure how valuable this may be for you as I wanted to perform all the tasks in one command and know where the error is at.

tnsping HAWKC is failing in the 2nd position.

[oracle@db-fs-1 ~]$ { tnsping HAWKA & tnsping HAWKC & tnsping HAWKB & echo ; } > /tmp/tnsping_`hostname  (more...)

RMAN: Synchronize standby database using production archivelog backupset

If you have not read RMAN: Synchronize standby database using production archivelog, then please do so.

# Primary archivelog is on local vs shared storage.
# Primary RMAN archivelog backupset resides on shared folder with Standby.
# Full backup is performed once per day and include archivelog with format arch_DB02_`date '+%Y%m%d'
# MANAGED REAL TIME APPLY is running.
PRI: /shared/prod/DB02/rman/
SBY: /shared/backup/arch/DB02a/

#!/bin/sh -e
# Michael Dinh: Aug 21, 2018
# RMAN sync  (more...)

RMAN: Synchronize standby database using production archivelog

I know what you are thinking, “Why is this nut of a DBA writing shell script to synchronize standby with achivelog !”

It just happens the environment is very restrictive and NO changes can be made without any change control.

In one week, there’s a planned switchover to RAC standby and it would be nice to have standby duplicated and ready for switchover.

How is this going to work as standby will lag for days (more...)

Which Oracle Release are you using?

Post Date: August 2018!

Recently an awesome Oracle Guru friend of mine questioned someone who was installing 11.2.0.4 with the word “seriously”, which is think shows that Oracle staff sometimes don’t live in the same technological world as the rest of business.

My response was:

11.2.0.4 is normal. In the real world:

– large corps mostly use old versions
– consultants look at current versions
– Oracle staff look (more...)

Oracle Weblogic 12c: Extracting the complete configuration via wlst.sh python script

If you want to get all information out of a weblogic server via wlst.sh than you can use the following script:
# written by Dietrich Schroff 2018
import sys


OutputFile='myfile.txt'
sys.stdout = open(OutputFile,'w')
connect('weblogic','mypasswd','t3://localhost:7001')
depth=0

def loopOverAllSubdirectories(goIntoThisDirectory,depth):
    depth=depth+1
    cd(goIntoThisDirectory)
    print depth," "*depth*2,goIntoThisDirectory
    try:
            completeInput=ls()
            inputArray=completeInput.split('\n')
        allParameters=[ x for x in inputArray if (not ("dr--" in x) or ("drw-" in x)) ]
(more...)

“Regulatorics: Offside is when the referee whistles” – I’m a speaker at #DOAG2018

Today my presentation is confirmed: “Regulatorics: Offside is when the referee whistles”. Maybe the German title will be  better understood: “Regulatorik: Abseits ist, wenn der Schiedsrichter pfeift”

The regulatory system has more and more influence on our software development.

Regulatory authorities, exteranl and internal Auditors are increasingly examining our IT and not longer only our business processes and balance sheets.
Some of them have better trained IT experts as we can find on the free market.

General standards such (more...)

BAAS: Battle Against Archiver Stuck – ALTERNATE Archive Location

If you are managing volatile systems, you might have encountered Archiver-Stuck in the past.

0RA-00257:archiver error, connect internal only until freed
ORA-16014:log 2 sequence# 1789 not archived, no available destinations

If this is the case, you might be interested in a rarely used feature called “ALTERNATE Archive Locations”. This is a second independent archive log destination, that is only used in case the primary destination is failing (full). In that case, the dest_2 is automatically (more...)

Blocking Prepared XA Transaction

There was an oracle-l thread last month about blocking sessions which could not be identified.

I replied back about a very niche scenario which I’d seen a few times before. And it’s just happened again so I thought it would be useful to just post some evidence on this.

Here are a couple of articles posted previously on XA transactions:

First, a reminder, from the posts (more...)

ORA-4031 Troubleshooting – Issue with durations in 11gR2

I recently had to troubleshoot an ORA-4031 issue at a client site. The issue reappeared 3 times within 2 months and only after escalating the SR to SEV1 and being quite persistent for an explanation, the second engineer attempting to solve the issue finally got it right.  Being curious, I digged into the trace files again to confirm and understand the issue here. This blog post describes the method to analyze the issue and (more...)

“#PL/SQL: Therefore, whoever binds forever: automate your tests” – I’m a speaker at #DOAG2017

 

Today my presentation is confirmed: “Therefore, whoever binds forever: automate your tests”. Maybe the German pun will be the better understood: “PL/SQL: Drum test-automatisiere, wer sich sich ewig bindet!”

I will speak over my experiences with following

  • several PL/SQL testing tools like at least
  • I will give you a demo of this tools and compare their capabilities for
    • architecture
    • branching
    • continuous integration
    • code coverage

If you (more...)

INSERT ALL caveat

Why you might want to think twice about using INSERT ALL.

One of those things I knew and then forgot.

So, let’s say you’ve got three tables or a partitioned table or something like that.

Let’s use regional tables for simplicity.

drop table t1_r1;
drop table t1_r2;
drop table t1_r3;

create table t1_r1
(col1 varchar2(2) not null
,col2 number not null
,check( col1 in ('R1')));

create table t1_r2
(col1 varchar2(2) not null
,col2 number not  (more...)

PROCESSED Messages not clearing from Oracle Queue

I was contacted by Dev team to look into Development database where Oracle queue size kept  on increasing. As per them messages were not getting cleared.They were running count on Queue table and the count kept increasing. To find out exact cause I included the msg_state in the query and found out that there were…

APEX 5.0 Beyond basics

iAdvise presented the APEX 5.0 roadshows in the first half of 2015. Besides the presentation about the new features, we provided 3 tutorials which helped the visitors to explore Oracle Application Express 5.0. Now we offer these tutorials through our blog. In this article the second tutorial is presented.

This tutorial helps you step by step through the process of migrating an application to the Universal Theme of Oracle Application Express 5.0. In this tutorial we talk about (more...)

ORA-01873 error running SAP pre-upgrade scripts

While trying to run pre_upgrade_status.sql script for DB upgrade (10.2.0.4 to 11.2.0.4), we got following error @pre_upgrade_status.sql ERROR at line 1: ORA-01873: the leading precision of the interval is too small ORA-06512: at line 8 On debugging further , found out that it was due to limit imposed on "INTERVAL DAY TO SECOND" datatype. By…

LGWR terminating instance due to error 338

Recently we came across a issue where our DB crashed with ORA-00338 error . Errors in file /oracle/diag/rdbms/orcl11g/orc11g/trace/orc11g_lgwr_24118.trc: ORA-00338: log 2 of thread 1 is more recent than control file ORA-00312: online log 2 thread 1: '/oracle/oradata/orcl11g/redo02.log' LGWR (ospid: 24118): terminating the instance due to error 338 DB couldn't be restarted as it gave same errors…

Permissions for both HDFS and local fileSystem paths

| Jul 18, 2014

Hi All,

Permission issues is one of the key error , while setting up Hadoop Cluster, while debugging some error found below table on http://hadoop.apache.org/ . It’s a good scorecard to keep handy.

 

Permissions for both HDFS and local fileSystem paths

The following table lists various paths on HDFS and local filesystems (on all nodes) and recommended permissions:

Filesystem Path User:Group Permissions
local dfs.namenode.name.dir hdfs:hadoop drwx——
local dfs.datanode.data.dir (more...)

Rolling upgrads using logical standby database.

Couple of weeks ago there was a Twitter discussion started by Martin Bach (@MartinDBA) about cases for logical standby implementation. A rolling upgrade was mentioned by Tim Gorman (@timothyjgormanas) as one of potential recommendations for using this rare use product. I have been involved in such project in the past and I prepared an instruction and did quite large number of rolling upgrades from 11.1 into 11.2.

There are couple of my “gotchas”

Best of Oracle Security 2013

I just uploaded my DOAG 2013 presentation “Best of Oracle Security 2013“.

 

This presentation shows how to bypass Oracle Data Redaction, become DBA using CREATE ANY INDEX, Hide information from Oracle Auding using VPD and more…

—————————————————

SQL> select * from scott.credit_card where 1=ordsys.ord_dicom.getmappingxpath((card_id),user,user);

(more...)

Decrypt Oracle 11.2.0.3 and 12.1.0.1 database link passwords

At Derbycon 3.0, László Tóth and Ferenc Spala  gave a a new presentation “What’s common in Oracle and Samsung? They tried to think differently… ” (Video). The main focus of the presentation was the Samsung encryption and a new framework called sandy but there was also a small (more...)

Fix for oradebug disable auditing available (11.2.0.3/11.2.0.4/12.1.0.1)

2 days ago I gave a presentation “Oracle 12c from the attackers perspective” at the DOAG SIG Security. I learned some interesting things, especially that a fix for the Oracle oradebug “disable auditing” problem is available since 9 months.

Oradebug allows to run OS commands and to enable/disable Oracle SYSDBA (more...)