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Franck Pachot

OOW14 Day 2 – Delphix #cloneattack

By | Database management, Oracle | One Comment

Do you know Delphix? The first time I heard of it was from Jonathan Lewis. And from Kyle Hailey of course. So it’s not only about agile and virtualization. It’s a real DBA stuff. So as I did yesterday with Dbvisit #repattack let’s install the demo. Here is the setup: one source virtual machine with an XE database one target virtual machine with XE installed but no database one virtual machine with Delphix And what can…

 
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Franck Pachot

OOW14 Day 1 – Dbvisit #repattack

By | Database management, Oracle | No Comments

Oracle Open World is not only conferences but also practice and networking. Today at the OTN lounge have installed the following demos on my laptop: a Dbvisit replicate #repattack with a Delphix cloning environement #cloneattack I’ll detail the former below and the latter tomorrow, but if you are at San Francisco and missed it, please come tomorrow to the same kind of session at the Oak Table World! You don’t even need the OOW registration…

 
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Franck Pachot

How to measure Exadata SmartScan efficiency

By | Database management, Oracle | No Comments

A thread on OTN Forum about Exadata came to the following question: “But how can I monitor if it is effectively used or not?”. This is a common question. There are 3 exclusive features coming with Exadata, and instance statistics can show their usage. Even better: two of them can even be checked on your current (non-Exadata) system. And that is good to foresee how Exadata can improve your workload. Let’s find how to measure the…

 
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Pierre Sicot

Oracle OEM Cloud Control 12.1.0.4 – agent upgrade & patch

By | Database management | No Comments

The new Oracle OEM Cloud Control 12.1.0.4 release migration makes it necessary for the DBA to migrate the old agent version to 12.1.0.4. If your infrastructure has a huge number of agents and if you want to apply the agent patches to the upgraded agents, this might be a very time-consuming job. However, there is a way to realize the operation in just one shot. In my example, we have an agent in version 12.1.0.3:…

 
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Pierre Sicot

Oracle OEM Cloud Control 12.1.0.4 – the new features

By | Database management | No Comments

This document describes the main new features of Cloud Control 12.1.0.4. A lot of new features are coming with the 12.1.0.4 version I will describe the most important ones, but you can also refer to this Oracle documen: http://docs.oracle.com/cd/E24628_01/doc.121/e25353/whats_new.htm#CEGFFGBI New management services repository page There is a new management services repository page providing details about the management repository: In the Setup Menu—> Manager Cloud Control, select health overview: You have access to a new performance…

 
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Franck Pachot

Thinking about downgrading from Oracle Enterprise to Standard Edition?

By | Database management, Oracle | No Comments

You are using an Oracle Enterprise Edition and thinking about downgrading to the Standard Edition? In this case, you must be sure that your applications are compatible. It’s not something easy to check. Here are a few ideas. Why? Why do you want to downgrade to the Standard Edition? For licensing costs, of course. Today, it is difficult to find a server with only a few cores. And Oracle Enterprise Edition is licenced per number…

 
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Franck Pachot

Oracle: How to move OMF datafiles in 11g and 12c

By | Database management, Oracle | One Comment

With OMF datafiles, you don’t manage the datafile names. But how do you set the destination when you want to move them to another mount point? Let’s see how easy (and online) it works in 12c. And how to do it with minimal downtime in 11g. Testcase Let’s create a tablespace with two datafiles. It’s OMF and goes into /u01: SQL> alter system set db_create_file_dest=’/u01/app/oracle/oradata’ scope=memory; System altered. SQL> show parameter db_create_file_dest NAME TYPE VALUE…

 
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Franck Pachot

Resize your Oracle datafiles down to the minimum without ORA-03297

By | Database management, Oracle | 32 Comments

Your datafiles have grown in the past but now you want to reclaim as much space as possible, because you are short on filesystem space, or you want to move some files without moving empty blocks, or your backup size is too large. ALTER DATABASE DATAFILE … RESIZE can reclaim the space at the end of the datafile, down to the latest allocated extent. But if you try to get lower, you will get: ORA-03297:…

 
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Franck Pachot

What’s the consequence of NOLOGGING loads?

By | Database management, Oracle | No Comments

When you load data in direct-path and have the NOLOGGING attribute set, you minimize redo generation, but you take the risk, in case of media recovery, to loose the data in the blocks that you’ve loaded. So you probably run a backup as soon as the load is done. But what happens if you have a crash, with media failure, before the backup is finish? I encountered recently the situation but – probably because of…

 
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Franck Pachot

Oracle 12.1.0.2.1 Set to Join Conversion

By | Database management, Oracle | No Comments

Recently, I described the Partial Join Evaluation transformation that appeared last year in Oracle 12c. I did it as an introduction for another transformation that appeared long time ago in 10.1.0.3 but was not used by default. And even in the latest Oracle 12c patchset 1 (aka 12.1.0.2.0) it is still not enabled. But it’s there and you can use it if you set optimizer_features_enabled to 12.1.0.2.1 (that’s not a typo!). Yes, that number looks…

 
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