New Events for Data Guard and Synchronous Redo Transport in 12c (1)

I may have said it before but I consider presenting and teaching a great way to expand one’s knowledge: first of all it requires me to really understand a subject. Secondly, when presenting, you get lots of interesting questions that can turn into blog posts like this one.

Lately I have been asked about the impact of synchronous log shipping to a physical standby database. I was sure there was an effect to be observed, (more...)

DDL triggers – interesting results

This question came in on AskTom, yielding a very interesting result when it comes to DDL triggers. To set the scene, I’ll first create a table called T which is just a copy of SCOTT.EMP

SQL> create table scott.t as select * from scott.emp;

Table created.

SQL> desc scott.t
 Name                                                              Null?    Type
 ----------------------------------------------------------------- -------- -----------------
 EMPNO                                                             NOT NULL NUMBER(4)
 ENAME                                                                      VARCHAR2(10)
 JOB                                                                        VARCHAR2(9)
 MGR                                                                        NUMBER(4)
 HIREDATE                                                                   DATE
 SAL                                                                        NUMBER(7,2)
 COMM                                                                       NUMBER(7,2)

Reading Execution Plans for Parallel DML

Parallel execution in Oracle seems to be a topic of myths, mysteries and misunderstandings. In this post I hope to clear up at least one of them by diving into a discussion about parallel DML. Actually, I want to show you two things that can go wrong with it.

My demo setup and case are pretty simple, I just create two copies of dba_objects:

SQL> create table a as select * from dba_objects;

Table created.


Delphix- Cannot Provision from Part of Timeflow

This was received by one of our Delphix AWS Trial customers and he wasn’t sure how to address it.  If any others experience it, this is the why it occurs and how you can correct it.

You’re logged into your Delphix Administration Console and you note there is a fault displayed in the upper right hand console.  Upon expanding, you see the following warning for the databases from (more...)

Can we trust the Exadata ISO image?

Recently i had to reimage a couple of Exadata compute nodes for different reasons like an almost simultaneous failure of 2 harddisks in the compute node.

After the compute got back online with a fresh image and restoring settings like cellip.ora, DNS, NTP and cellinit.ora we got to the point where we need to reinstall the Oracle components, this clusters has an Grid Infrastructure, and (more...)

Links for 2017-02-22 []

Wading Through Database Platforms

As a heterogenous company, I get a lot of questions on what database platforms are important, why and if we should invest in them.  When looking at some of the lists and some of the marketing, it can be a bit overwhelming.

Now I’m not going to promise to take all of the confusion out of the myriad of database platforms out there, but I’m hoping to help (more...)

Website Broken Links (Mostly Not Oracle-Related)

In a recent twitter exchange someone asked if I scan for broken links, oh if you only knew, and the answer is yes. I don’t do it all the time as the results can be rather depressing, and I am OCD enough to force myself to fix them. I also get people notifying me of them, which is very welcome, so I am always trying to keep on top of this stuff. Based on that exchange I (more...)

Oracle New Public Cloud Licensing Policy – Good or Bad?

A little while ago after a question from a customer about supporting Oracle products on the Google Cloud Platform (GCP) I decided to take a look for any updates to the Oracle public cloud support policies. The document can be easily found on the Oracle website. I quickly noticed some significant changes in the new version of the document. More specifically, I’m referring to the changes that came with the latest version of that document (more...)

Oracle ASM in Azure

Now we're doing more stuff in the cloud I've had to dust off my old sysadmin hat and start doing more of the stuff I'd forgotten about from when i was a sysadmin (10+ years ago). This week I've been setting up ASM instances in Azure so i had to do all the work around making the disk devices available to ASM.

On premises I'd just pick up the phone and say create devices for (more...)

File movement in and out of Azure

After a busy couple of weeks i finally got round to writing something new up - not strictly directly database related but If you're doing any work with Azure - getting files in and out of it is a key point of understanding. In my case i wanted to copy over some tarred up oracle software trees from on premise that we have fully patched up to date and then put onto azure servers using (more...)

Log Buffer #505: A Carnival of the Vanities for DBAs

This Log Buffer Edition searches through various blogs of Oracle, SQL Server and MySQL and picks a few contemporary ones.


Comma separated search and search with check-boxes in Oracle APEX

Once you have defined your users for your Express Cloud Service, all users with the role of Database Developer or higher can access the database Service Console.

Big Data Lite 4.7.0 is now available on OTN!

Install and configure Oracle HTTP Server (more...)

Backup Oracle Databases to AWS S3

There are different options for backing up Oracle databases to Cloud, but using Oracle Secure Backup module to take backups into AWS S3 is one of the most efficient methods in terms of costs and backup/restore performance.

In this post I will show you how to install, configure and use Oracle Secure Backup to take your Oracle database backups to AWS S3. This method can be used for Oracle database version 9.2 or higher.


Enable DDL logging

Enable DDL Logging:

ENABLE_DDL_LOGGING enables or disables the writing of a subset of data definition language (DDL) statements to a DDL log.

SQL> show parameter enable_ddl_logging

———————————— ———– ——————————
enable_ddl_logging boolean FALSE

SQL> alter system set enable_ddl_logging=TRUE scope=both;

System altered.

SQL> show parameter enable_ddl_logging

———————————— ———– ——————————
enable_ddl_logging boolean TRUE

SQL> select value from v$diag_info where name=’ADR Home’;



SQL> select value from v$diag_info where name=’ADR (more...)

Listener Exception : Could not create listener: TNS-04414: File error

When I tried to add listner using netca for my test database, I am getting below issue

“Listener Exception : Could not create listener: TNS-04414: File error’

It could be possible ” Listener file having some wrong entries, so you need to check” or renaming current listener and tried to add (Here Please be note, your current listener configuration will be removed).

AWS Quirks and Fake News to the Delphix Admin Console

We’ve been working hard to create an incredible new trial version of Delphix that uses AWS, which is built with the open source product Terraform.  Terraform is a tool that anyone can use to build, version and manage a product effectively and seamlessly in a number of clouds.  We are currently using it to implement to AWS, but there is a bright future for these types of open source (more...)

The Flash Insider: To POC or Not To POC?

Proof of Concept?

Guest Post

I’m excited announce another guest blog written by my good friend and funny-talking American cousin Nathan Fuzi. Like me, Nate comes from a database background but joined the all-flash storage revolution back in its infancy. Which means, like me, Nate how has a little tombstone on his résumé marked Violin Memory. But even though he has since moved up to working in THE CLOUD, Nate’s experience working for an AFA vendor is invaluable. Over six years, he worked (more...)

Long Parsing and PGA limits

Recently I’ve seen not so smart optimizer behavior: one query took long time to parse, and ended with an error hitting PGA_AGGREGATE_LIMIT in few minutes; another query was just parsed for ages while using reasonable (under 2G :)) amount of PGA and still could hit PGA_AGGREGATE_LIMIT but after way more time – up to an hour.

Both cases were similar and involved queries which were accessing views; and those views’ code is generated by an (more...)

Oracle Database Result Cache Troubleshooting

I was troubleshooting an issue where the Oracle Database Result Cache did not get used when the RESULT_CACHE hint was specified inside a subquery. As the main query has a sysdate inside, the RESULT_CACHE Hint can not be specified for the main query, but only for the subquery.

SELECT SQ.*, sysdate FROM
(SELECT * FROM tableX, ....) SQ;

When using “/*+ RESULT_CACHE */ inside of Subquery, result cache was not (more...)

MobaXterm 10.0

MobaXterm 10.0 was released a couple of days ago. As well as the usual bug fixes there are a number of enhancements and a new flatter look and feel.

Downloads and changelog in the usual places.

Happy upgrading!



MobaXterm 10.0 was first posted on February 20, 2017 at 8:39 am.
©2012 "The ORACLE-BASE Blog". Use of this feed is for personal non-commercial use only. If you are not reading this (more...)